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Question Panasonic TH 42PA20 shut down issue ( AVS Forum Plasma Flat Panel Displays )
Updated: 2008-05-24 05:10:06 (1544)
Panasonic TH 42PA20 shut down issue

While watching my Panny today, I heard a nasty whinning sound for about 5 seconds and then the Display powered off . It was a very high pitched sound followed by the power cutting off. I was unable to turn the power back on until I unplugged the display and waited a few minutes to power it back on. Since this occured this afternoon, it has happened three times since. ANy ideas what may be going on? Thank you.

Answers: Panasonic TH 42PA20 shut down issue ( AVS Forum Plasma Flat Panel Displays )
Panasonic TH 42PA20 shut down issue

I ordered the chip & brought it to a tv repair shop & he desoldered the old & installed the new chip I had already bought. He only charged me $20.00 for the job. No more shutdown & high pitch wine when turning it on.

norcalsvt

Panasonic TH 42PA20 shut down issue

I too have just joined the club. I purchased my TH42PA20 in Dec 2003 (July 2003 manufacture date) and wouldn't ya know it - last night during the 2nd half of the Superbowl I experienced my first shutdown. Like others, I heard the high pitched whining noise followed by the shutdown and red blinking lights. I was able to re-boot by unplugging. However this was only a temporary fix. It shutdown again and again. I see that there is a possible fix, however I have a question. Has anyone experienced this problem ONLY when using cable TV? After enduring a shutdown this morning while watching cable TV (Comcast) I decided to conduct a non-scientific test. I watched DVDs for hours without incident. Only when I returned to watching cable did I experience a shutdown (within 25 minutes). Is there a correlation between the shutdown and cable TV. Additionally, during the shutdown this morning I was receiving 7 blinking reds - now I'm only getting 5. Any help is greatly appreciated.

Panny hater

Panasonic TH 42PA20 shut down issue

Am in the club with my TH-42PA20. Thanks to all for the important technical information you've provided. I used the instructions here to find my service hours and found that we've only put about 5400 hrs on the set. (Not sure if that's low or high for a 4-yr-old set, but we travel a lot, so my guess is low.)

Mine shutdown for the first time last month. Am 6 mos pregnant and husband is deployed, so I can't get the TV off the wall for the repair, but am enduring the unplug and reboot process over and over. I find mine lasts for about 35 minutes at a time now -- regardless of what I'm watching (satellite or DVD).

I can't get to the serial number, but I assume the part is the same for all of these 2002 models, right? Am planning to go ahead and order it and have the husband deal with it when he gets home in April. Am in agreement with everyone else that a serious acknowledgment by Panasonic along with in-home repair would be a huge plus (especially in my situation) right now.

Thanks again, everyone.

preggers

Panasonic TH 42PA20 shut down issue

And boom there goes my TH-42PWD6 in the UK, 5 blinking lights and squealing noise. lasted a long time, set is probably 3.5 years old.

Just wanted to check the part number i need
#C5HABZZ00123

not #C5HABZZ00115 as i have seen in some threads?

also anyone know of a UK parts seller?

thanks for all the great advice, i would have been forever lost, if it wasn't for this place!

findon

Panasonic TH 42PA20 shut down issue

Another joins the club

My TH-42PWD6 started the shut down problem yesterday.
My unit Manufactured Date JUL 2003
Serial# YB3420048

findon,

I called Panasonic and they told me that C5HABZZ00123 is the same as C5HABZZ00115.

linnmagic

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by linnmagic
Another joins the club

My TH-42PWD6 started the shut down problem yesterday.
My unit Manufactured Date JUL 2003
Serial# YB3420048

findon,

I called Panasonic and they told me that C5HABZZ00123 is the same as C5HABZZ00115.
Not true. 00123 is the one you want.

Techniwizard

Panasonic TH 42PA20 shut down issue

Techniwizard:

I Had My Panasonic Th42pw5 With 2 Flashes Looked At For $65.00 Diagnostic Charge. Tech Guy Says My " Y Buffer " Is Bad. He Wants To Charge Me $450.00 For Labor And The Part . I Took It Home Opened It Up And Found That On Start Up The Ss Board Diode Light Does Come On - But The Sc Board Diode Light Will Not Come On.
Can You Tell Me What Is Wrong?
Thanks!

bbad4all

Panasonic TH 42PA20 shut down issue

My TH-42PA20 took a dump last week while I was turning it on "power-up" and the L.E.D. flashes twice . I've tried to unplug and try again with no luck, just tries to start up then fails and blinks twice at me again and again. I've read this entire thread and unless I missed it didn't see what part I might be able to replace. I've gone through panasonic and got the name of the repair shop and spoke to them and our hrs won't mesh until my business slows down and I can take some time off to take it down. I'd really like to tear into it myself if any one "TW" has any tips or ideas.
It's lame to have a $4000 (not in todays dollars but what I spent) dead display on the wall that I totally did the remodel of my living room around. I work with my hands and am sure I can replace whatever part on whichever board. I believe It was spoke of ( 2 blinks ) in an earlier post but the model of the display was not the same as mine.

Thanks for all the info I've already got as a lurker in past posts.

leading edge

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by bbad4all
Techniwizard:

I Had My Panasonic Th42pw5 With 2 Flashes Looked At For $65.00 Diagnostic Charge. Tech Guy Says My " Y Buffer " Is Bad. He Wants To Charge Me $450.00 For Labor And The Part . I Took It Home Opened It Up And Found That On Start Up The Ss Board Diode Light Does Come On - But The Sc Board Diode Light Will Not Come On.
Can You Tell Me What Is Wrong?
Thanks!
Doesn't sound right. Try running with the SU and SD alternately disconnected from the SC board (leave ribbons connected, and only do one board at a time)

Look for a good top or bottom half of a picture depending on which board is removed. Probably the SU board but if not, find another service center.
Where are you located ?

T Wiz

Techniwizard

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by leading edge
My TH-42PA20 took a dump last week while I was turning it on "power-up" and the L.E.D. flashes twice . I've tried to unplug and try again with no luck, just tries to start up then fails and blinks twice at me again and again. I've read this entire thread and unless I missed it didn't see what part I might be able to replace. I've gone through panasonic and got the name of the repair shop and spoke to them and our hrs won't mesh until my business slows down and I can take some time off to take it down. I'd really like to tear into it myself if any one "TW" has any tips or ideas.
It's lame to have a $4000 (not in todays dollars but what I spent) dead display on the wall that I totally did the remodel of my living room around. I work with my hands and am sure I can replace whatever part on whichever board. I believe It was spoke of ( 2 blinks ) in an earlier post but the model of the display was not the same as mine.

Thanks for all the info I've already got as a lurker in past posts.
This is not the classic failure symptom spoken of in this thread. The power supply failure is usually 5 or 7 blinks.

Yours is probably a similar problem to the unit mentioned before your post although a different model. Same troubleshooting procedure...

Try running with the SU and SD alternately disconnected from the SC board (leave ribbons connected, and only do one board at a time)

Look for a good top or bottom half of a picture depending on which board is removed. Probably the SU board but if not, there is not much more you can do by yourself without electronic test equipment - it wouls need to go to a service center. Where are oyou located ?

T Wiz

Techniwizard

Panasonic TH 42PA20 shut down issue

Albuquerque NM and THANKS

leading edge

Panasonic TH 42PA20 shut down issue

Sorry, I'm not familiar with any service centers out your way.

Try this number:

Plasma Hotline for Priority Service at 1-800-973-4390

The old on-line locator now points to this number only.

T Wiz

Techniwizard

Panasonic TH 42PA20 shut down issue

Techniwizard:
I live in Prescott, AZ will the parts from a TH-42PWD7UY fit my TH-42PW5UZ.
Thanks

bbad4all

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by bbad4all
Techniwizard:
I live in Prescott, AZ will the parts from a TH-42PWD7UY fit my TH-42PW5UZ.
Thanks
Sorry, no they will not. All model years are different.

Industrial TH42PWD5UY boards will fit consumer TH42PW5UZ

Consumer TH42PA20 boards will fit TH42PWD6UY except the tuner and input boards of course.

T Wiz

Techniwizard

Panasonic TH 42PA20 shut down issue

bbad4all,

did you ever figure out which board has failed on your plasma?

I have spare SU, SD, D1, D2, and power boards from the broken plasma (a 5UZ) I bought off of ebay. I don't have a known working SS or SC boards though, as I replaced both of those in my plasma.

Also to anyone swapping out these actual boards, those little ribbon cables are a real PITA to get seated properly. It took me about 20mins to get them right....

boykster

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by boykster
bbad4all,

did you ever figure out which board has failed on your plasma?

I have spare SU, SD, D1, D2, and power boards from the broken plasma (a 5UZ) I bought off of ebay. I don't have a known working SS or SC boards though, as I replaced both of those in my plasma.

Also to anyone swapping out these actual boards, those little ribbon cables are a real PITA to get seated properly. It took me about 20mins to get them right....
FWIW the SC in a TH37PW5UZ and TH37PWD5UZ is the same as TH42PW5UZ. The SS, SU, and SD are different. THE D1, D2, and PS are also the same in the 37 and 42 W5 series.

Prime suspect is the SU. By pulling it from the SC, you can look at the tops of the drive ICs on the underside of these boards. Any cracks or obvious overheating on these ICs will point out the bad board.

When changing the SU and SD, you can remove the sef tapping screw that holds the bezel, lift it slightly and move the bezel forward to give better access to those troublesome ribbon cables. They must fit exactly. If not the unit may still shutdown, show black horizontal lines, or worse yet, short out the panel.

T Wiz

Techniwizard

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by Techniwizard
FWIW the SC in a TH37PW5UZ and TH37PWD5UZ is the same as TH42PW5UZ. The SS, SU, and SD are different. THE D1, D2, and PS are also the same in the 37 and 42 W5 series.

Prime suspect is the SU. By pulling it from the SC, you can look at the tops of the drive ICs on the underside of these boards. Any cracks or obvious overheating on these ICs will point out the bad board.

When changing the SU and SD, you can remove the sef tapping screw that holds the bezel, lift it slightly and move the bezel forward to give better access to those troublesome ribbon cables. They must fit exactly. If not the unit may still shutdown, show black horizontal lines, or worse yet, short out the panel.

T Wiz
Good to know about the SC board being the same with the 37-5U series as well. I spent a good amount of time cross referencing part numbers to make sure that I bought a dead plasma that would provide the proper parts for my 5UY.

Also good to know about moving the bezel, too bad I didn't know this before I wrestled with those cables I was getting the black horizontal lines, so I would power the unit on briefly to determine which ribbon cable was mis-adjusted (each cable represents a section of the screen), power off, adjust that one and re-power. I'm glad I DIDN'T know that it could result in a panel short out, as I probably would have gotten nervous and broken something .

Quick question: is there a "trick" to disconnecting the SS2/SS3 child boards from the SS board? I actually ruined the cable/connector on my "old" board when disassembling (was putting together a disassembly/packing how-to for the person I bought the parts from), but it sure looks like those boards "should" be able to seperate. No big deal, as I was going to replace the SS / SS2 / SS3 boardsets anyhow, just curious.

Cheers,

Rich

boykster

Panasonic TH 42PA20 shut down issue

Rich,

The connector pulls straight up from the SS2 and SS3. Notice there are small "tabs" on either side of these connectors. Gingerly use the thumb and forefinger to "rock" the beast until it pulls up.

Sometimes it's just easier to change the entire assembly including the sub-boards.

TW

Techniwizard

Panasonic TH 42PA20 shut down issue

TW,

Thanks, that's how I figured it should work, but for some reason the board I tried to remove I somehow applied too much pressure in the wrong place. I did end up just replacing the entire assembly, and had the seller of the "donor" plasma pull all 3 boards as one unit to avoid him possibly doing the same damage.

If I ever need to re-visit the SS board issues (replaced SC and SS boards without fully diagnosing which board was the culprit) I could possibly replace the sub-board I damaged and re-purpose the "old" SS board. Those pesky SS and SC boards are expensive.....

Cheers,

Rich

boykster

Panasonic TH 42PA20 shut down issue

Code:
         
       o          "We're not worthy, we're not worthy"  
      <|\      o__
     _/ \_    _/  \_ 
 Techniwizard

jlib

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by jlib
Code:
         
       o          "We're not worthy, we're not worthy"  
      <|\      o__
     _/ \_    _/  \_ 
 Techniwizard
No need to grovel, just remember knowledge is power...

Techniwizard

Panasonic TH 42PA20 shut down issue

I got the parts(C5HABZZ00123) yesterday, it took me 30 mins. to install it. No more shut down problem. For those of you installing it yourself, be careful not to put too much solder, the trace on the pc board are very close to each other that if you put too much solder, it can make a short circuit. if somebody needs help with the same problem, let me know. I live in the Bay Area.

linnmagic

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by J_bryan
Well the techinician came out and opened up the panel and determined that i need a new SS board (he had a heavy accent so i hope i understood correctly). He was not sure what caused the SS board to go, but that it needs to be replaced. I plan to call panasonic to get a price for this part. Stay tuned...
The SS board has been replaced. 8UY is working again.

J_bryan

Panasonic TH 42PA20 shut down issue

Looking for TNPA2534ae (sc BOARD) for TH42PWD5UY. Anyone have one lying around that they want to sell.....or does anyone stock used...lastly who sells them the cheapest...cheaper than the panasonic 513.51. Does everyone give 150 core? Any help much appreciated.

JasonBoever

Panasonic TH 42PA20 shut down issue

my 42PZ700 died today. I've had it for 2 weeks.
7x flashing power light.
Called Panasonic .. no one was there because of the weather (yeesh) so called BB - I was 4 days passed the replacement date - (I ordered at Xmas - took them 2 weeks to get it to me.)

Called Kromer Radio on BB advice, should be up and running again by Wednesday.
Judging by all the posts here, this seems to be a recall level problem.

I love my TV and it gives the best picture I've ever seen, obviously that doesn't matter if i can't turn it ON!!!
Oh well.

chicklet

Panasonic TH 42PA20 shut down issue

I too have a TH42-PW6 (Manufacturing date June 2003 and S/N YB3340477) and I inherited from my brother. He reported no problems with it to me. However I have suffered the blink issue and the display shutting down.

It appears to be an overheat problem and an external fan placed facing the lower rear right quarter solves the problem.

As per the advice here on this thread I investigated the IC551 and took the rear panel off. The part was indeed a STRF6668B. Advice from Signals UK was that the heatsink compound may have dried out and no longer effective and to check that rather than replace as the likelihood was that the STRF6668B would either work or not and not be intermittent I checked this and replaced it. I also tried the hot/cod method by using a hairdryer to heat up the power board and the IC551. However the screen did not shut down - its heatsink was very hot though. I tried other boards and again no shutdown.

I would like to clarify the behaviour of the IC551 and if it relates to the screen overheating and shutting down. Should I just replace it?

I would also like to check if this display is meant to have fans as fans are mentioned in this thread and I cannot find them in the unit. Are they meant to be there or am I missing something?

I am considering adding PC fans. Any advice is welcome in adding fans.

KehPan

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by KehPan
I too have a TH42-PW6 (Manufacturing date June 2003 and S/N YB3340477) and I inherited from my brother. He reported no problems with it to me. However I have suffered the blink issue and the display shutting down.

It appears to be an overheat problem and an external fan placed facing the lower rear right quarter solves the problem.

As per the advice here on this thread I investigated the IC551 and took the rear panel off. The part was indeed a STRF6668B. Advice from Signals UK was that the heatsink compound may have dried out and no longer effective and to check that rather than replace as the likelihood was that the STRF6668B would either work or not and not be intermittent I checked this and replaced it. I also tried the hot/cod method by using a hairdryer to heat up the power board and the IC551. However the screen did not shut down - its heatsink was very hot though. I tried other boards and again no shutdown.

I would like to clarify the behaviour of the IC551 and if it relates to the screen overheating and shutting down. Should I just replace it?

I would also like to check if this display is meant to have fans as fans are mentioned in this thread and I cannot find them in the unit. Are they meant to be there or am I missing something?

I am considering adding PC fans. Any advice is welcome in adding fans.

1.) Replace the IC with the newer type with suffix M as outlined earlier in this thread.

2.) All "W" model Plasmas did not originally come with fans. Add them if you wish.

TW

Techniwizard

Panasonic TH 42PA20 shut down issue

Thanks Techniwizard.

I will order it up and get the 'M' suffix part.

Is there any advice out there on the best way to add fans?

KehPan

Panasonic TH 42PA20 shut down issue

I've looked thru these forums but have not found quite the same issue for my model. I have a TH50PHD7UY - heard a pop coming from the set and it turned off. Tried to turn the set on again, and I get a green LED followed by the red LED blinking 7 times. Does this indicate bad fan rotation on the 7UY? Seems like the pop would indicate a more serious issue. Any help is appreciated.

hman613

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by Randyman
Well, I'd just like to throw this out there. I'm getting the 7 blink code with my only 32 day old 42pz77u! Bad thing about it is though is that sears won't even take it back for an exchange as its 2 day's past its 30 day policy. Give me a break.

Anyone know am I best off calling the panasonic desk and let them come out and diagnose/fix under warranty, or will this TV never be the same again?

TIA
my 42z77u just did the same thing today. i bought it during boxing week. i tried to turn it on, it just shut itself off, and does the blink 7 times thing.

how did you get your's fixed? i wonder if sears will be nice to me and give me an exchange even though it's been just over 2 months.

unfortunately panasonic canada is not open on weekends so i have to call again on monday.

sucks how a new model can have a similar problem to old models.

ju5tbringit

Panasonic TH 42PA20 shut down issue

I have a TH-42PA25 Date Aug 2004. This is my Fathers TV and he just had a local service company replace the PS board and I think they changed the SU but he is not sure. It lasted about 2 months and now it is shutting down with 7 off blink codes. It will come on if I unplug it for a few seconds and may play 30 min or hours. It will squeel when switching off with the remote. He just spent $600 for the last service that did not last. They also kept the TV for 10 weeks. Could this be the Scan Driver 2 defect? I have not had time to pull the cover but will do so tomorrow. I hate to spend any more big money on this set because I can get him a Visio for about $800 but if it is an easy fix I would like to help him out with this set. I only have a DVOM and a soldering iron with me right now.
Thanks

dguru

Panasonic TH 42PA20 shut down issue

Sorry my poor connection caused me to double post
Thanks

dguru

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by dguru
I have a TH-42PA25 Date Aug 2004. This is my Fathers TV and he just had a local service company replace the PS board and I think they changed the SU but he is not sure. It lasted about 2 months and now it is shutting down with 7 off blink codes. It will come on if I unplug it for a few seconds and may play 30 min or hours. It will squeel when switching off with the remote. He just spent $600 for the last service that did not last. They also kept the TV for 10 weeks. Could this be the Scan Driver 2 defect? I have not had time to pull the cover but will do so tomorrow. I hate to spend any more big money on this set because I can get him a Visio for about $800 but if it is an easy fix I would like to help him out with this set. I only have a DVOM and a soldering iron with me right now.
Thanks
Sounds like the service company replaced the PS with the old style that had the thermal IC 551, the main subject of this thread.

Check if the PS board is numbered TNPA2841AB and that IC 551 (lower right corner) has a suffix "B". If so that is probably the problem.

The newer PS PCB should be numberd TNPA2841AH and IC 551 should have an "M" suffix.

You have 2 choices, whine to the local servicer that he should have used the newer IC/PCB or replace the IC 551 yourself following the directions in this thread. Part # C5HABZZ000123 for IC 551.

TW

Techniwizard

Panasonic TH 42PA20 shut down issue

Thank You for the reply.

I had him find his invoice and they said they replaced the Power Supply TNPA2841AH and the Y Sustain Board STRF6668M. This sounds hooky because the number he has for the Y Sustain board is the same as IC551.

Anyway I removed the cover and checked IC551 and it is F6668B and have it running flat on a padded table with the cover off. I hear a loud buzz from the transformer closest to IC551. I also noticed IC551's heat sink gets very hot!

I can't get it to mess up now with the cover off. It cut off 2 times last night within 1.5 hours. I wonder if rigging a 80 mm fan into the back cover blowing on IC551 will help the problem.

If you have any ideas it would be great. I am making a list of all the part numbers before I put it together again in case I need to order a different board.

dguru

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by dguru
Thank You for the reply.

I had him find his invoice and they said they replaced the Power Supply TNPA2841AH and the Y Sustain Board STRF6668M. This sounds hooky because the number he has for the Y Sustain board is the same as IC551.

Anyway I removed the cover and checked IC551 and it is F6668B and have it running flat on a padded table with the cover off. I hear a loud buzz from the transformer closest to IC551. I also noticed IC551's heat sink gets very hot!

I can't get it to mess up now with the cover off. It cut off 2 times last night within 1.5 hours. I wonder if rigging a 80 mm fan into the back cover blowing on IC551 will help the problem.

If you have any ideas it would be great. I am making a list of all the part numbers before I put it together again in case I need to order a different board.
Part # is a bit out of order (LOL)

Order and replace IC 551 part # C5HABZZ000123 do not use the part # stamped on the IC. Total cost around $25 with shipping.

There are complete instructions including pix in this thread or an archive of this thread. To remove, cut the leads close to the PCB and desolder one at a time. Clean out all feedthrough holes and install the new IC. Screw it to the heatsink before soldering. Be sure to solder both top and bottom of the board.

Board TNPA2841AH would only have the newer IC. Board TNPA2841 or TNPA2841AB had the older IC.

In a pinch, removing the heatsink screw and adding more thermal heatsink compound may help for awhile.

TW

TW

Techniwizard

Panasonic TH 42PA20 shut down issue

I put it on an HD channel and it shut off after a half hour. All the LED's behind the set went out as well. As I said it has a F6668B for IC551. SOB thats the bad chip discussed in the thread. I will order the new chip and install it in a few weeks on the next visit.

Meanwhile I ripped a 80mm case fan out of the computer I built for my Mother and cut a hole in the grill behind IC551 where it will blow right on it. I will use a wall cube to power it for now.

EDIT:

Been running with the fan for over an hour and its still looking good. Ordered the new chip.

dguru

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by Techniwizard
Part # is a bit out of order (LOL)

Order and replace IC 551 part # C5HABZZ000123 do not use the part # stamped on the IC. Total cost around $25 with shipping.

There are complete instructions including pix in this thread or an archive of this thread. To remove, cut the leads close to the PCB and desolder one at a time. Clean out all feedthrough holes and install the new IC. Screw it to the heatsink before soldering. Be sure to solder both top and bottom of the board.

Board TNPA2841AH would only have the newer IC. Board TNPA2841 or TNPA2841AB had the older IC.

In a pinch, removing the heatsink screw and adding more thermal heatsink compound may help for awhile.

TW

TW
really stupid question, but how did you remove the screw? The heat sink right accross from it does'ntallow me to get a screwdriver near it.

Did you remove the whole heatsink?

Wangta01

Panasonic TH 42PA20 shut down issue

If I remember correctly (been over a year since I did it, no problems since)
I needed a right-angle screwdriver to get to it.
I definitely didn't remove anything else.
-S

sdj544

Panasonic TH 42PA20 shut down issue

Yup, right angled screwdriver.

In a pinch, one of those cheesy hex phillips ratchet things will also work.

TW

Techniwizard

Panasonic TH 42PA20 shut down issue

Arg - Don't have one of them handy. Will try and get one tomorrow.

Do you guys know if a 45 watt soldering iron will do the trick? I bought a 15w this morning only to find out it did next to nothing on the solders to the board. Hoping 45 is enough, but I thought I read that someone had a 120 watt soldering gun??

I called a bunch of TV repair places in Boston (Cambridge area) and none of them agreed to solder the board. They said they repair TV's by looking at them first and determining what is wrong, then sending out what is needed to the appropriate place....oy

Wangta01

Panasonic TH 42PA20 shut down issue

If you use a longer (5-6 inch) thin shank phillips screwdriver with a smaller handle that doesn't hit the adjacent heat sink, you can slightly flex the board enough to just get a bite on the screw enough to loosen it. Cheap drivers work better than your Stanley or Craftsman as the cheap ones have the Asian metric taper on their tips - fits the screw better.

45 watts should do it. 15 watts is for mini-IC work.

Once you get the screw out, bend the thing forward and cut the leads with a small diagonal cutter, then remove the IC body. Unsolder and remove the old pins one at a time.

Heat the remaining solder and remove with solder wick and poke a hole with a toothpick to keep it open.

Insert the new IC, tighten the screw, then solder the pins. One or two need solder on BOTH sides of the board so check carefully.

Look for any solder mishaps, reinstall and give it the 60 Hz test.

TW

Techniwizard

Panasonic TH 42PA20 shut down issue

Hi everyone
Does this model TH-42PA50H with about 7-8 blinks has the same problem? Anyone can help: http://www.avsforum.com/avs-vb/showthread.php?t=1007144

kinetics@excite

Panasonic TH 42PA20 shut down issue

Sorry, no, the PA50 chassis is very different than the PA20.

Power LED 6-7 blinks is undocumented. Could be the PA or PB board in this model but I have not worked on this consumer model.

TW

Techniwizard

Panasonic TH 42PA20 shut down issue

My tv has the 'problem'. I should receive the 'part' today sometime. Tonight I dismantled the unit quite easily. Based on all the tens of thousands of boards, comments and blogs, I was still somewhat unsure exactly what to do. Every single post I have seen is very specific, however I have found that my experience in reading all this stuff for the past few years still left me wondering when I actually came down to doing it. When some posts say 'remove the back panel', there is a back panel that looks removeable, however it is not, and shouldnt be removed.

I am going to make this easy on everyone from here on out. When I receive the part today I will just make a little video and put it on YouTube. I already have the back off the TV and see IC551.

I honestly cannot believe how some TV repairman can sleep at night after charging people hundreds of dollars for what seems to me to be a 30 minute job from start to finish. If the part is $20, and your hourly is 80, charge $60 flat to fix this issue.

Stay tuned for a VERY simple video of exactly what to do to resolve this MONUMENTAL issue that has perplexed users for years. I honestly cannot think of a single hardware problem that has taken up more forum space in the history of hardware problems.

Everyone should thank TW for all his dedication, understanding, community service, and consistent "Control V's" over the years.

--Almost Happy...Video at 10.

BzzzzzzzBlink

Panasonic TH 42PA20 shut down issue

I noticed that TW just made his 777th post.

Lucky Numbers TW, thanks for all your free services...

BzzzzzzzBlink

Panasonic TH 42PA20 shut down issue

I was given this unit by my father after he upgraded to a 50". It worked for about a month, but now I am having the following problem with it: When I turn it on I get a green light, a flash on the screen of the color spectrum, and then shutdown with 2 red blinks. I have been reading through all of the threads for the past few hours but have not found anything that deals with this problem directly. This unit was manufactured in March 2004 and the S/N is YG4230256. I have checked the IC551 part, and I have the newer (M) version. I am guessing that the problem lies with the SD, SU, SC, or SCAN Driver 1 as determined by TW's BLINK diagnostic PDF file posted back in 2002. Am I on the right track? Can anyone that has had this exact problem assist me with solution? Thank you in advance for your time. This is a very helpful forum!

Phillipsd_11

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by BzzzzzzzBlink
I noticed that TW just made his 777th post.

Lucky Numbers TW, thanks for all your free services...
Wowser, just noticed that myself, thanks!

T Wiz

Techniwizard

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by Phillipsd_11
I was given this unit by my father after he upgraded to a 50". It worked for about a month, but now I am having the following problem with it: When I turn it on I get a green light, a flash on the screen of the color spectrum, and then shutdown with 2 red blinks. I have been reading through all of the threads for the past few hours but have not found anything that deals with this problem directly. This unit was manufactured in March 2004 and the S/N is YG4230256. I have checked the IC551 part, and I have the newer (M) version. I am guessing that the problem lies with the SD, SU, SC, or SCAN Driver 1 as determined by TW's BLINK diagnostic PDF file posted back in 2002. Am I on the right track? Can anyone that has had this exact problem assist me with solution? Thank you in advance for your time. This is a very helpful forum!
Gut feeling ? bad driver IC on the SU or SD boards.

Quick test - with power OFF, alternately pull the SU or SD from where it plugs into the SC board (all on the left as viewed from the rear).

Leave the ribbon cables to the panel connected. Let the board hang where it will not short anything. Power up and look for either a good top or bottom 1/2 pix whichever board you remove. Do not remove both at the same time.
If removing neither brings a pix, the SC (and maybe SU and/or SD) are bad.

TW

Techniwizard

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by Techniwizard
Gut feeling ? bad driver IC on the SU or SD boards.

Quick test - with power OFF, alternately pull the SU or SD from where it plugs into the SC board (all on the left as viewed from the rear).

Leave the ribbon cables to the panel connected. Let the board hang where it will not short anything. Power up and look for either a good top or bottom 1/2 pix whichever board you remove. Do not remove both at the same time.
If removing neither brings a pix, the SC (and maybe SU and/or SD) are bad.

TW
Thank you for the the suggestion and the reply. When I disconnect the boards, should I disconnect the corresponding power supply to the board as well? Also, Is there a consumer model that is the similar to the industrial model I have? Thanks again.

DP

Phillipsd_11

Panasonic TH 42PA20 shut down issue

Hi all
I've got a late summer '03 PWD6 which has just developed this problem .
Thanks to the excellent comments here, I've hopefully got the solution on it's way in the post.
Before I start the repair can I clarify one point, I'm sure I've heard that plasma screens should be kept upright, is this correct?
It would be very tempting to lay the panel face down to work on but not if it'll cause more problems

Cheers, Paul

Paden73

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by Paden73
Hi all
I've got a late summer '03 PWD6 which has just developed this problem .
Thanks to the excellent comments here, I've hopefully got the solution on it's way in the post.
Before I start the repair can I clarify one point, I'm sure I've heard that plasma screens should be kept upright, is this correct?
It would be very tempting to lay the panel face down to work on but not if it'll cause more problems

Cheers, Paul
You may lay it flat for short periods of time such as this repair, installing slot boards, etc.

It is mainly while in transport that it must remain vertical.

T Wiz

Techniwizard

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by Paden73
Hi all
I've got a late summer '03 PWD6 which has just developed this problem .
Thanks to the excellent comments here, I've hopefully got the solution on it's way in the post.
Before I start the repair can I clarify one point, I'm sure I've heard that plasma screens should be kept upright, is this correct?
It would be very tempting to lay the panel face down to work on but not if it'll cause more problems

Cheers, Paul
Yo guys - just wanted to report back. 1 hour later and some very very careful soldering work, my Panny is back up and running. Been running 6 hours straight now without problems - I actually fell asleep while "testing" it! Thanks everyone for your help.

To answer Paden73's question, I put my TV flat so I could unscrew the board (with the chip we need to replace), then put it back on the stand while I did the replacement on the board.

One thing to note - you really need a solder vacuum or something to scoop up the solder from the 5 holes. I picked one up at radio shack for $7 (or something around there) and it was really critical to getting the new chip in. I had trouble initially with the solder vacuum, but after some trial and error, was able to get all the solder from the holes so I could insert the replacement chip. The hardest part was the first step - removing the old legs! Maybe it was due to my lack of inexperience (I got better as time passed), but I had difficulty removing one of the legs, which was made worse by the fact i didn't have any needle nosed pliars or something narrow to grab the legs with (ended up using tweezers!). Anyway, I would suggest just being patient and taking your time. Once the old legs are out and the old solder vacuumed up, it was pretty easy!

Anyways, thanks everyone for your help - ya'll saved me big $$! Paden73 - if you need help, PM me.

Wangta01

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by hiker
I'm in Novato and they came here and did the repair for less than $200, out of warranty. They did my neighbor's PA20 at another time under warranty without cost to them.
thanks for the info. I ended up emailing them & Jeff emailed me back saying it's about $450 for in home repair. He did mention that I may get it covered if I can find my invoice even though it's out of warranty. I would have to bring it in because it's a "bench warranty"? I'm not sure what that means so I'll have to try to call them during the day.

norcalsvt

Panasonic TH 42PA20 shut down issue

I just got hit by the Panasonic TH-42PA20 shut down glitch in the past month. This site has been valuable in opening my eyes to the problem and solution. I have the IC 551 and will install this week. The question I have, if anyone cares to comment, is whether this problem is due to a "over sensitive" power shutdown, or a part which is going bad. If the part is too sensitive, why does it wait for a time period before starting to affect the TH-42PA20. (in my case, almost two years, though the set was little used for the first year). Wouldn't anunderdesigned circuit show symptoms almost immediately. This strikes me as the performance of a part which is failing after some point in time, either thermally of from defect. Maybe somebody has already discussed this? Thanks.

BugBitten

Panasonic TH 42PA20 shut down issue

I got bit, will order the replacement part tomorrow! Thanks for all the info.

- Ryan

GrafxWerks

Panasonic TH 42PA20 shut down issue

Thanks to the information on this thread I have installed the new part in my Panasonic. The Panasonic part is actually a voltage regulator according to the package coding, probably a $5.00 part from an electronics dealer. It cost $20.02 from Panasonic plus shipping, but I, like most, people here was so desparate to get it fixed that I forked out the money. It seems to me that Panasonic should at least provide the part for free.

Let's see how that could work. They know how many sets they have made, after all they have these things called serial numbers. Panasonic could ship one voltage regulator to each incident of an owner indicating the problem, when and if the person calls in. Maybe they could keep track of this in a modern device called a database and a computer! Naw, thats too easy. Let's pretend that there is no real problem and tell people when they call in that they have to pay $200+ for a service call and subsequent repair (another $200) and then they can argue with Panasonic to get their money back if and only if Panasonic agrees. But let's see, if we admit there is a problem, people might expect us to fix it. (Duh)

I wonder how much bad will has been generated by 42 inch EDTV Panasonic plasma screen purchasers of sets made between June and August of 2003. It seems to me from reading this thread and my own experience, that failure of this set due to this voltage regulator is just a matter of time, not an isolated incident. Panasonic should take a cue from Phillips, who is currently doing a recall fix of US sold plasma TV's which had a faults capacitor. Cheers!

As long as I'm on a soapbox, I have an observation for anyone (perhaps another techie). In troubleshooting this set, prior to replacing IC551, I plugged the set into an isolation transformer to make sure I had no ground problems. The unit would not even stay on for 5 seconds before shutting off in some LED blinking shutdown mode. I checked all line voltages and they were fine. After replacing the infamous IC551 I have been running the unit for the past two hours on this very same isolation transformer. Any thoughts, anyone.

I think it is time for Panasonic to issue a recall on this set and voluntarily fix the problem. Admit you have the problem and be up front about it. I'm fortunate in that I got the set as a gift and my costs of fixing it have been the part and aggravation, but as much as I like the plasma TV, I know my next high end electronics purchase will not be from Panasonic, it will be from somebody who I think will stand behind their product. (see above)

All comments, positive or negative aprreciated.

Thanks,

BugBitten

BugBitten

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by GrafxWerks
I got bit, will order the replacement part tomorrow! Thanks for all the info.

- Ryan
For anyone in the Toronto area, I ordered the part through HyTech Electronics and pulled the board myself. They had the part the next day and installed the chip in less than 1/2 hour. Great service, and total cost was under $80 CAD! Their contact info is on the Panasonic website.

Thanks to everyone who contributed to this thread, it saved me several hundred dollars. Removing the circuit board was a slice, by far the hardest part was lifting the Plasma off the wall!

Cheers,

- Ryan

GrafxWerks

Panasonic TH 42PA20 shut down issue

unfortunately joined the club

i turn it on (switch), led is green for 3 seconds, then a wide horizontal bar flashes and then it turns off, followed by blinks

i think it blinks twice, then solid, then twice again

after that the tv wont turn on through power button of remote

i have a clip of a video but the site wont let me post it (spam prevention)
its at vimeo, enter search term "panasonic plasma busted"

my model is pwd6, business model

this happened the same day some guy was doing home inspection at my house. i suspect he f'd with the outlets but he says nothing he did coulda broke my tv. im so mad

called media associates in mountain view, they said theyd charge me $110 just to diagnose.. wtf

any input would be nice, thanks

kewlio

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by kewlio
unfortunately joined the club

i turn it on (switch), led is green for 3 seconds, then a wide horizontal bar flashes and then it turns off, followed by blinks

i think it blinks twice, then solid, then twice again

after that the tv wont turn on through power button of remote

i have a clip of a video but the site wont let me post it (spam prevention)
its at vimeo, enter search term "panasonic plasma busted"

my model is pwd6, business model

this happened the same day some guy was doing home inspection at my house. i suspect he f'd with the outlets but he says nothing he did coulda broke my tv. im so mad

called media associates in mountain view, they said theyd charge me $110 just to diagnose.. wtf

any input would be nice, thanks
Two blinks is not the classic failure. More than likely a scan drive problem unrelated to the power supply or your inspector.

Send a PM for more details.

TW

Techniwizard

Panasonic TH 42PA20 shut down issue

Sorry to ramble here, but I really hate getting screwed and so please bare with me while I vent for a moment...

I have a TH-42PA20 that went black on me last week. When I turn it on, I hear the relay click but the screen doesn't light and then I hear another click of the relay (as if the TV is shutting down) and the LED blinks one shots flash, followed by a long flash and repeats (which persists til the set is unplugged). I called Panasonic and they denied any known problems and referred me to Elite Electronics in Alameda. They guy at Elite said that 'it sounds like a power supply failure, which will cost $500 for the part plus labor, which would cost a few hundred more'. Needless to say, I was a little surprised that he could diagnose the problem in 3 minutes of conversation so I called Panasonic back, who told me that indeed it was impossible to know if a power-supply has failed and that they would make some phone calls on my behalf and help to get me to an authorized repair service (truth be told, they were very helpful). They recommended another place in Foster City who asked about the LED sequence and then said that the service call would be $95 and that the repair labor cost would be $395 (not including parts, irrespective of the issue).

Thank you VERY much for the recommendation for the self-fix (I'm a technical dude and I'm very comfortable doing this myself). Worst case, I'll call Media Associates. It is very nice to hear that there is a professional repair alternative available in the Bay Area.

What is really frustrating to me is not that there is a problem with the TV (stuff happens, right?), and not even that Panasonic is not admitting to the issue (oh well), but instead, to add insult to agony, they don't even have the decency to police their 'authorized service agents' to ensure that their consumers don't get screwed when it comes time to fix the problem.

Anyhow, thank you all for your help here!

sfplasmadude

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by kewlio
unfortunately joined the club

i turn it on (switch), led is green for 3 seconds, then a wide horizontal bar flashes and then it turns off, followed by blinks

i think it blinks twice, then solid, then twice again

after that the tv wont turn on through power button of remote

i have a clip of a video but the site wont let me post it (spam prevention)
its at vimeo, enter search term "panasonic plasma busted"

my model is pwd6, business model

this happened the same day some guy was doing home inspection at my house. i suspect he f'd with the outlets but he says nothing he did coulda broke my tv. im so mad

called media associates in mountain view, they said theyd charge me $110 just to diagnose.. wtf

any input would be nice, thanks

Yikes, I just tried to post a message and I could not post so I will try to summarize again. I have a TH-42PW5 and I am having the same issue. Powers up for a few seconds, 2 flashes and then the power supply relay shuts off. Diagnostic LED's on the SS and SC boards light up. D6769 first, then D6765 (SS) and D6583 (SC) concurrently and then all 3 turn off < 1 sec later when the relay turns off.

I found a good Panasonic service manual on the net:

Google "gphd5_techguide", since this forum will not let me put a link in this post yet. Should be on wimtv.be site.


Flow chart on page 42 says to check SS/SC LED's. Although they turn on only momentarily I assume the SC/SS boards are OK. VDA voltage seems OK so it then points to the D1 board. Anyone have any ideas on how to debug the D1 board? I really don't want to swap the board unless I know that it is bad.

A quick probe of the a few "SOS" signals seem to indicate some protection problem but I have not had a chance to probe with a scope.

My manufacture date is September 2002 (I think, not at home now) and it has worked flawlessly until now.

Any help is greatly appreciated.

Dead_42PW5

Panasonic TH 42PA20 shut down issue

Remove the mounting screws and pull the SU pcb loose from the SC pcb. Leave the ribbon cables to the panel connected. Power up and look for a good lower half screen. If so, replace the SU pcb, If not, replace and do the same to the SD pcb and look for a good top half screen. If so, replace the SD pcb. If neither, possibly the SC or one of the other boards are bad. They all interact so it is hard to pinpoint except by substitution.

The guide you have is for an HD unit. Yours is standard definition so the circuitry is different although similar. TH42PW5UZ is the same as the industrial TH42PWD5UY in that model year except the video inputs are BNC jacks instead of common RCA jacks.

Techniwizard

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by Techniwizard
Remove the mounting screws and pull the SU pcb loose from the SC pcb. Leave the ribbon cables to the panel connected. Power up and look for a good lower half screen. If so, replace the SU pcb, If not, replace and do the same to the SD pcb and look for a good top half screen. If so, replace the SD pcb. If neither, possibly the SC or one of the other boards are bad. They all interact so it is hard to pinpoint except by substitution.

The guide you have is for an HD unit. Yours is standard definition so the circuitry is different although similar. TH42PW5UZ is the same as the industrial TH42PWD5UY in that model year except the video inputs are BNC jacks instead of common RCA jacks.

Thanks for the leads. I cannot get to it until this weekend but I will update the board when I get additional information.

Dead_42PW5

Panasonic TH 42PA20 shut down issue

Thanks to the tech guys on this forum, I had the above mentioned shut down fault. Purchased the uprated 551 IC. Fitted it myself, works great. Again, many thanks.

s4c

Panasonic TH 42PA20 shut down issue

No luck with the SU/SD boards. However I did some more probing on the SOS signals (Digital Volage Meter only) and found out that there are multiple failures. It appears that the failures are all related to the scan and sustain pulse generation circuitry. I took a brief look at the schematics and the digital signals which control the high-voltage generation originate in the D2 board. To really check this out I will need to probe with an oscilloscope but I was wondering if the you think that D2 failure seems reasonable or could it be D1 or both D1 and D2. Any ideas on how to narrow this down?

Thanks

Dead_42PW5

Panasonic TH 42PA20 shut down issue

[b]Dead_42PW5

I have a TH-42PWD6UY with the same exact problem as yours and kewlio. So far from talking to a local television service repair technician and a EXTREMELY helpful Senior Engineer with Panasonic we have come to the conclusion that it is possibly the scan drive pc board. 2 blinks on a 6uy (most likely the same on a 5 series) refers to a problem with the scan drive, and after trying the SU and SD pc board test with no resolve I will hopefully be trying a replacement SC board in the near future.

PowerStrokeHD

Panasonic TH 42PA20 shut down issue

I'd be really upset if a few yr old plasma had problems, you guys paid a premium for these panels and feel panasonic should really own up to the problems even after 5 yrs
It's s shame!!
Only thing is i'm glad i bought mine at Costco's and i'd really use it if i had problems, e-bay is also a good place for cracked panels, i'd def get a "parts" panel.
Good luck to you all!

Bud-man

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by PowerStrokeHD
[b]Dead_42PW5

I have a TH-42PWD6UY with the same exact problem as yours and kewlio. So far from talking to a local television service repair technician and a EXTREMELY helpful Senior Engineer with Panasonic we have come to the conclusion that it is possibly the scan drive pc board. 2 blinks on a 6uy (most likely the same on a 5 series) refers to a problem with the scan drive, and after trying the SU and SD pc board test with no resolve I will hopefully be trying a replacement SC board in the near future.
My probing seems to point to protection on both the SC and SS boards turning on. Not sure if one causes the other to fail or from a common source and at the same time. You might want to verify it by looking at the diodes on each SOS signal prior to the wired-OR connection where all diodes are connected. On SS there is a window comparator which looks to see if a divided-down voltage is between 5 and 10 volts and I am getting about 1.5V DC. This is apparently a high voltage signal (10:1 divider so looking for about 50-100V peak) so even though I am measuring DC it is still way too low and should fail. I also see "SOS" failures on other high voltage related signals generated on the SC board. The HV generation all seems to be controlled by D2 timing/logic.

Can you ask your Panasonic tech if he thinks the D1 or D2 board is bad and how would we verify it? Also, how did you contact the tech. Can anyone call or do you have to be an authorized repair center, etc. If I could talk to a tech it would be alot of help.

Dead_42PW5

Panasonic TH 42PA20 shut down issue

You're not kidding. My manufacture date was November 2002 (I think I posted September previously) and I purchased around May 2003. So it's 3 years old and cost me $4000. I cannot believe that the big electronics firms still only offer a 1 year warranty when all electronics component vendors offer better warranties.

Hard disks: 3-5 years.
Computer RAM: lifetime.
Video cards: 3-5 years

It's just a big scam to force you to pay an extra 10-25% for an extended warranty when the electronics should last the lifetime of the set. Any electronic part that fails after the infant mortality period (the period when failure occur do to manufacturing defects) is due to poor design. Most IC's are designed for at least a 10 year lifetime under extreme voltage and temperature stress. This is 10 years operating, not 10 years calendar. They basically don't stand behind their design quality and expect you to pay extra to CYA. If some of the vendors offered a longer warranty this would be a huge competitive advantage but I don't see it happening any time soon.

If a $200 DVD player fails after 3 years I'll take my lumps but for a $4k set to fail in 3 years is a real pisser. Plus, you need to spend a ton of money to get it fixed. Those D1/D2 board cost about $650 apiece.

Dead_42PW5

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by Dead_42PW5
My probing seems to point to protection on both the SC and SS boards turning on. Not sure if one causes the other to fail or from a common source and at the same time. You might want to verify it by looking at the diodes on each SOS signal prior to the wired-OR connection where all diodes are connected. On SS there is a window comparator which looks to see if a divided-down voltage is between 5 and 10 volts and I am getting about 1.5V DC. This is apparently a high voltage signal (10:1 divider so looking for about 50-100V peak) so even though I am measuring DC it is still way too low and should fail. I also see "SOS" failures on other high voltage related signals generated on the SC board. The HV generation all seems to be controlled by D2 timing/logic.

Can you ask your Panasonic tech if he thinks the D1 or D2 board is bad and how would we verify it? Also, how did you contact the tech. Can anyone call or do you have to be an authorized repair center, etc. If I could talk to a tech it would be alot of help.

Well unfortunately I have no degree in electronics so I have not done such a indepth diagnosis of any of the boards. From what I understand anyway, most technicians would not do this either as the most common way of fixing these panels is to keep swapping boards until the problem is resolved.
Both the engineer and the local tv tech said the SC pcb could be my problem, but short of them physically seeing the unit its only a logical guess. Unfortunately talking only gets you so far and swapping boards gets it fixed!

Dead_42PW5 check your PM's

PowerStrokeHD

Panasonic TH 42PA20 shut down issue

I don;t like the sounds of that because I am planning on buying a similar model

b_rad4

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by b_rad4
I don;t like the sounds of that because I am planning on buying a similar model
The "Shutdown Issue" is related to the Panasonic 6th Generation Models. Newer generation plasmas can have problems with the power supply but nothing to do with the above posts.

.

BruZZi

Panasonic TH 42PA20 shut down issue

wow, there is a ton of information in this thread. i have a TH50PHD7UY and i am experiencing this problem. it's been about 16 months since i bought the plasma so it is out of warranty.

when i turn on the tv, it is green for a few seconds and then immediately blinks red. it blinks for 6 times and then stays steady red and then blinks again, etc.

i called panasonic support and they wouldn't help me much...just referred me to the local service techs. local service techs said they never heard about this problem and they would have to send someone over, etc.

guy came by today to check it out. he took the tv apart, ran a bunch of tests and said that he's never seen this happen and that it's a weird issue that i'm having, etc. he said that he thinks it's the "SC board" that is bad. he also didn't give me an estimate but said that he'd call next week after doing more research. his "ballpark" figure was $600-$1000 to fix this!

i told him i read about this on the internet and it might be a power supply unit that is bad, etc. he said he'd do some research on the internet also.

obviously, this guy didn't seem to know what he was doing. i paid $45 to have him come out.

anyone know of a tech who can fix this in the southern california area? thanks.

RVD.

RVD

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by RVD
wow, there is a ton of information in this thread. i have a TH50PHD7UY and i am experiencing this problem. it's been about 16 months since i bought the plasma so it is out of warranty.

when i turn on the tv, it is green for a few seconds and then immediately blinks red. it blinks for 6 times and then stays steady red and then blinks again, etc.

i called panasonic support and they wouldn't help me much...just referred me to the local service techs. local service techs said they never heard about this problem and they would have to send someone over, etc.

guy came by today to check it out. he took the tv apart, ran a bunch of tests and said that he's never seen this happen and that it's a weird issue that i'm having, etc. he said that he thinks it's the "SC board" that is bad. he also didn't give me an estimate but said that he'd call next week after doing more research. his "ballpark" figure was $600-$1000 to fix this!

i told him i read about this on the internet and it might be a power supply unit that is bad, etc. he said he'd do some research on the internet also.

obviously, this guy didn't seem to know what he was doing. i paid $45 to have him come out.

anyone know of a tech who can fix this in the southern california area? thanks.

RVD.
You may want to check and see if all your fans are operational. I remember reading a panasonic service manual and seeing that 6 blinks refers to a fan malfunction. I am pretty sure that a malfunctioning fan could cause a shutdown leading to the 6 blinks. Although if it is the SC pcb you are probably easily looking at $500-$750.

PowerStrokeHD

Panasonic TH 42PA20 shut down issue

it's weird. the technicians left so i tried plugging in the tv set (to mess with the fans). to my surprise, the tv turned on and the light stayed green. so i went ahead and reattached the hdmi cable (i have the hdmi slot extension installed) but no picture. then i noticed that even when i change inputs, there's nothing on the screen. it's like i just get a black screen now no matter what i do but the light stays green. i think i should be seeing "video 1", "video 2", stuff like that on the screen when i press the input button even if there's no picture right?

RVD.

RVD

Panasonic TH 42PA20 shut down issue

thanks to Techniwizard's help, I got this fixed. The two guys who came by last Friday still haven't called. I received some information from Techniwizard about a local technician here so I called him.

The only catch was that I had to bring the unit over to his location. This is tough because the TV is mounted on the wall and the TV is located on the second floor of my house. Last Friday when the other techs were here, we removed the TV from the wall so that part was already done. I spent some time last night with my wife bringing the TV down the stairs and into the car. She was complaining but we got it down...wives don't seem to appreciate physical manual labor.

I took the unit over to this guy's office and about 20 minutes later, he had it fixed. It was a bad SC board. They were able to figure out in like 10 minutes what the other techs couldn't figure out in 4 days and counting...He said that the other techs unplugged a part so that the light would stay green but it was a bad part.

It was expensive but they charged me for the part (he said it was his cost) plus $100 for labor which I thought was fair.

If anyone else is in the southern California area, I would recommend them.

Mir Nazarzai
M INDUSTRIAL AUDIO VIDEO
950 E. Orangethorpe, Unit H
Anaheim, CA 92801
Tel: (714) 992-0984 Fax: (714) 992-0937

RVD.

RVD

Panasonic TH 42PA20 shut down issue

BTW, they have an office in Las Vegas also so they will travel, for a fee of course.

TW

Techniwizard

Panasonic TH 42PA20 shut down issue

Just for the record I bought a TH-42PWD6EX (I am in indonesia) about 28 months ago and recently started having the shutdown problem. I have a plug-in board for DVI and noticed it happens more often on that input when I switch off my DVD player which uses that DVI connection. I called panasonic and didn't do a www search until he was here and didn't find anything. This thread was great finding the problem. Same symptoms high pitch and usually 5 blinks of the LED when I was hit by it. They finally came back today after the initial visit and replaced the power board for the price of 35 US$ workman ship and only charged me for the value of the IC (20.02) so about 55 $ total.... Lets hope it'll stay good now. I had them check the chip Code and it ended with 'M' on the replacement board. Kudos to them for doing it this way.

PS My Serial number is YH3630001, so I guess it was manufactured some where in august 2003.

Thanks a lot for all the Good info in this thread..


Erick

kacang

Panasonic TH 42PA20 shut down issue

Agree with RVD, lots of info on this site. My 50PHD7UY show symptoms similar to what is described in this thread the major difference being that the screen goes black (the led stays green) and I get the yellow ?no signal? on my screen. This happens after few hours of football on a Sunday afternoon. I turn the display off with my remote and back on and everything is fine for a short while and then the sequence repeat itself again. I have experienced the same as described in an earlier post, coax dies (no signal) and I can still watch on the component input. I recently added a HDMI card and now it is worse for the HDMI and coax inputs. Can watch TV for about two hours and the HDMI and coax slots will die but the component input seems to function, screen does blink now and then on the component like it wants to die also but so far it just keeps going. I removed the coax input (slot 2) last night and I it has not gone to a black ?no signal? screen for me after two hours on the HDMI (slot 1 input). So it looks to me like the power supply cannot handle the extra card and the additional current required by adding a card is making the power supply problem worse for input 1 and 2 but not for 3.

Techniwizard or anybody else’s comments will be appreciated very much.

ljo

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by skwiggly
Hey all,
I've got a Panasonic TH-42PX6U with 7 blinks. I unplugged the SU board, bottom half of the screen was ok, so I ordered a replacement SU board. Put it in, the full screen appeared but with black lines across the top, and then a few minutes later, the TV powered down and went back to 7 blinks.

If I only leave the SU board plugged in, the top half of the screen comes on, dark grey color with black lines, then powers down. I've tried replugging the ribbon cables in multiple times, I don't think their alignment/fit is the issue.

Did I short out the SU board? Is there any other way apart from ordering another one to verify that it is in fact the culprit here?

And if I did short it out, does anyone have any spares laying around?

thanks,
Scott
What is the board part number ??? TNPA????

TW

Techniwizard

Panasonic TH 42PA20 shut down issue

Tnpa3818

skwiggly

Panasonic TH 42PA20 shut down issue

Techniwizard,

I am new to the site. I could sure use some your help to troubleshoot and repair my Panasonic TH-37PD25. The TV is about 2 1/2 years old and just suddenly stiopped powering on. The power light flashes 12 times. I am certainly willing to try a repair but could sure use some guidance. Rough quote to repair based on description of problem was $800.00. Iust not sure it is worth repair unless I find part and do myself. Thank you in advance for any help you could provide.

Neubium

Panasonic TH 42PA20 shut down issue

I have a TH-42PA20 that has the 5 blink problem & took it to a local shop & was told they can't fix it. Could I get some info from somebody on what I can do to save my TV. Thanks in advance for the help.

Pendence

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by skwiggly
Hey all,
I've got a Panasonic TH-42PX6U with 7 blinks. I unplugged the SU board, bottom half of the screen was ok, so I ordered a replacement SU board. Put it in, the full screen appeared but with black lines across the top, and then a few minutes later, the TV powered down and went back to 7 blinks.

If I only leave the SU board plugged in, the top half of the screen comes on, dark grey color with black lines, then powers down. I've tried replugging the ribbon cables in multiple times, I don't think their alignment/fit is the issue.

Did I short out the SU board? Is there any other way apart from ordering another one to verify that it is in fact the culprit here?

And if I did short it out, does anyone have any spares laying around?

thanks,
Scott
Doing some more research, and talking to a couple repair shops locally, it seems like the power supply is a very possible culprit. Can anyone advise me on how to diagnose whether my power supply is working or not?

thanks,
Scott

skwiggly

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by skwiggly
Doing some more research, and talking to a couple repair shops locally, it seems like the power supply is a very possible culprit. Can anyone advise me on how to diagnose whether my power supply is working or not?

thanks,
Scott
Probably not the PS. The black lines were caused by misaligned ribbon cables. They must fit EXACT or you will get this symptom. The mismatch probably toasted the new SU board and now possibly took part of the SC or SS boards with it.

7 Blinks is SU, SD, or SS, no mention of power supply.

T Wiz

Techniwizard

Panasonic TH 42PA20 shut down issue

hi there, i have a panasonic TH-42PX60B plasma, following a fuse blowing and being changed in the power supply (plug) i now have power to the set again but 10 blinks and then nothing any help much appreciated ?????

mattymanny

Panasonic TH 42PA20 shut down issue

I have a TH-50PX25 that is dead. The power LED blinks 7 times upon power on. If anyone has access to the service manual for this model, I would like to know how to narrow down which board is the problem. I was able to get a hold of the manual for the 50PX75 and followed those troubleshooting instructions. Basically, It said to unplug SC2 and SC20. Power still went off after about a minute. Then It said to check that pin 1 of P25 was 15V. Mine was 12V (though I don't know if this is normal for the PX25). Then it said to check VSUS at P2 which was 172V.

I'm not sure what to do from here. According to the PX75 manual this means a bad SS board. But I don't know if this procedure can work on the PX25. Any advice?????

Peeep

Panasonic TH 42PA20 shut down issue

I purchased my TH-42PA20, 11-03-2003. It has worked flawless until last week. That is when I jioned the 7-5 red light blink club. It shuts down, power button useless. Unplugging, saying a quick Prayer, plugging back in, the unit may work fine, or shut itself back off. Called Panasonic, they told me I needed to take it to a service center. They WOULD not comment about the shut down issue at all. I am glad I found this forum. I have read every post available. TW seems to be very helpful. Panasonic service center in Montgomery, Alabama, 3D Electronics wants $299.99 to look at the unit, with a $199.99 charge for in home pick up. So I will be out $500! I did pay over $4000.00 for the TH-42PA20 in 2003. I ordered another Panasonic, this time I went to 50 inch model. Hopefully, I will not be foolish for doing so. TW do service centers have some kind of ratings? I found another service center in Columbus, GA (102 miles). I think I will take the TH-42PA20 there, rather than the 15 mile trip to Montgomery.

gobamago

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by gobamago
I purchased my TH-42PA20, 11-03-2003. It has worked flawless until last week. That is when I jioned the 7-5 red light blink club. It shuts down, power button useless. Unplugging, saying a quick Prayer, plugging back in, the unit may work fine, or shut itself back off. Called Panasonic, they told me I needed to take it to a service center. They WOULD not comment about the shut down issue at all. I am glad I found this forum. I have read every post available. TW seems to be very helpful. Panasonic service center in Montgomery, Alabama, 3D Electronics wants $299.99 to look at the unit, with a $199.99 charge for in home pick up. So I will be out $500! I did pay over $4000.00 for the TH-42PA20 in 2003. I ordered another Panasonic, this time I went to 50 inch model. Hopefully, I will not be foolish for doing so. TW do service centers have some kind of ratings? I found another service center in Columbus, GA (102 miles). I think I will take the TH-42PA20 there, rather than the 15 mile trip to Montgomery.
Service Centers need to maintain certain standards to retain their Factory Authorization. Not sure what those are but there are periodic reviews. It may shock you to know that those prices are not out of line. That new models are 1/4 the price originally paid does not lessen the complexity or skills required to diagnose and repair these devices.

That being said, there is enough info in this thread to repair this particular problem on this particular chassis produced during this particular time frame.

If your IC 551 has the noted suffix "B", it is a pretty safe bet that replacing it with the newer suffix "M" IC will take care of the problem.

As some folks have done, check the part on the board. If it is suffix "B", order the new part and either DIY or take the board and the new part to a "TV Shop" and have the part replaced for some customary fee.

You may get lucky and only have to invest $100 - $150 total, and not have to drive 200 miles.

T Wiz

Techniwizard

Panasonic TH 42PA20 shut down issue

Thank you TW. I will receive my new Panasonic TH-50PZ85U early next week.
Panasonic is my choice. TH-42PA20 perform well flawlessly until last week.
After mounting the 50 inch, I will take the 42 place back in the stand and remove the back panel. I will look to see the parts mentioned in this thread.
Not being a TW myself, this maybe as far as repairs I will attempt. Thank you for your advice.

gobamago

Panasonic TH 42PA20 shut down issue

TW,
I have the link to order parts. I read where fans need to be replaced. How many fans should I order for the TH-42PA20? I have the fan part number. I could not find the order part number for IC551M to replace the IC551B? Hopefully my new 50 inch will arrive tomorrow. My plan is to order the parts and pay for their installation
in hopes to save money.
Thanks for all the help!

gobamago

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by gobamago
TW,
I have the link to order parts. I read where fans need to be replaced. How many fans should I order for the TH-42PA20? I have the fan part number. I could not find the order part number for IC551M to replace the IC551B? Hopefully my new 50 inch will arrive tomorrow. My plan is to order the parts and pay for their installation
in hopes to save money.
Thanks for all the help!
AFAIK, there are no fans in the TH42PA20.

IC 551 is C5HABZZ00123

T Wiz

Techniwizard

Panasonic TH 42PA20 shut down issue

The people on this forum have been extremely helpful so far, especially Techniwizard. So thank you all for that.
Techniwizard, I need help with the last few steps here. I have a 50PX25 that blinks 7 times when it is turned on. I would like to figure out which board(s) are bad so I can replace them and enjoy this TV again.

A troubleshooting guide would be very helpful, or at least the page with diagrams for the 7 blink problem. In the meantime, I found 2 resistors on the SC board that are burnt out. They are 0.22 ohms so I am going to try replacing those with new ones and see what happens. I know that often times more than one board is faulty so I really need to know how to narrow it down.

The 50PX25 uses many of the same boards as the 50PX20, 50PHD6, 50PHW6, so a manual for any of those will probably work as well.

Peeep

Panasonic TH 42PA20 shut down issue

LED Chart for TH50PX25UP

7 Blinks is the SCAN area, where you found the 2 bad resistors.
Try to power up with the SU or SD disconnected from the SC board. Leave the ribbons to the panel connected.

Look for a good upper or lower 1/2 screen. The removed PCB is likely bad if the other 1/2 screen appears.

TW

Techniwizard

Panasonic TH 42PA20 shut down issue

Try this link:

http://tsn.pasc.panasonic.com/viewin...C/PVAccel.html

It includes the 50 inch unit.

Techniwizard

Panasonic TH 42PA20 shut down issue

Thanks Techniwizard. I tried turning the power on with either the SU or SD board disconnected from the SC board. No luck. Just the same 7 blinks in either case.

When I press the power button to turn it on, the led is solid red, after 25 seconds, 2 clicks, then 5 seconds go by and another click, then the 7 blink pattern starts.

Peeep

Panasonic TH 42PA20 shut down issue

TW replaced my TH-42PA20 last night with my new TH-50PZ85U. The TH-42PA20 has a build date of AUG 2003. I saw pictures earlier in this thread with the back cover removed. You corrected that post with the explantion that the photos were of the TH-42PA20. What should I expect or be cautious doing removing back cover looking for the IC551?

gobamago

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by gobamago
TW replaced my TH-42PA20 last night with my new TH-50PZ85U. The TH-42PA20 has a build date of AUG 2003. I saw pictures earlier in this thread with the back cover removed. You corrected that post with the explantion that the photos were of the TH-42PA20. What should I expect or be cautious doing removing back cover looking for the IC551?
Leave it unplugged for several minutes so the power supplies will discharge any residual voltages to prevent shock hazards.

Then the worst part is keeping track of all the screws and their locations. There are a couple different types and lengths so it may pay to make a small diagram and/or borrow the cupcake tins from the Mrs. to keep things in order.

TW

Techniwizard

Panasonic TH 42PA20 shut down issue

Quote:
Originally Posted by Peeep
Thanks Techniwizard. I tried turning the power on with either the SU or SD board disconnected from the SC board. No luck. Just the same 7 blinks in either case.

When I press the power button to turn it on, the led is solid red, after 25 seconds, 2 clicks, then 5 seconds go by and another click, then the 7 blink pattern starts.
Sounds like the SC and either the SU and SD are bad.
If you can find the TNPAxxxx numbers from the boards I can take a peek to see if I have any spares.

TW

Techniwizard

Panasonic TH 42PA20 shut down issue

The SC board is a TNPA2914 and I know for sure that it is bad because there are 2 burnt out resistors on it. I should be receiving 2 new resistors today that I can use to replace the 2 burnt out ones. I am curious to see what happens when I do that. Do you think that is a good idea? What are the chances that the bad resistors is the only problem with the SC board? I have attached pictures of the bad resistors.

Peeep

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