Panasonic G20 Failure :/

[tom66]

Re: Panasonic G20 Failure :/

No, Panasonic very rarely have bad caps, extremely unlikely to be the problem.
Suspect a shorted SC board.

[aleshaak]

Re: Panasonic G20 Failure :/

Thanks! But i read that 4 blinks is P board. For SC board is 6 blinks
viz. 6 blinks: Driver SOS 1 SU-Board / SD-Board / SC-Board / SS-Board (SC/SS Energy Recovery Circuit)

Is there any possibility to prove which board is broken? By mutimeter, or by connecting and disconecting boards and watching led error codes?

[tom66]

Re: Panasonic G20 Failure :/

If the SC or SS shorts it will cause a mis-detection of P board fault leading to 4 blinks.

You can determine the failed board by unplugging the SC board or SS board.

When the SC is unplugged, if it is the P or SS it will blink 4 times, otherwise it will blink 6 or 7 times.

When the SS is unplugged, if it is the P or SC it will blink 4 times, otherwise it will blink 8 times.

With both boards unplugged, if it is the P then it will blink 4 times, otherwise it will blink 6, 7 or 8 times.

[aleshaak]

Re: Panasonic G20 Failure :/

So i try it. Looks like SC?

All borad plugged blink 4 times
SC is unplugged blink 7 times, and electric smell from upper part of SC (strange, because is unplugged)
SS is unplugged blink 4 times
Both unplugged blink 7 times

I try to probe with multimeter. Set to 200 ohm. And on SC connector show me nothing, but sometimes "flash" between 100-195..

[tom66]

Re: Panasonic G20 Failure :/

So SC is bad on this model.

[Jonkke]

Re: Panasonic G20 Failure :/

Hello from Finland,

Also my Panasonic TXP50G20 died last weekend. At first the led of death gave 4 blinks.
Then I started to diagnose the problem guided by instructions given previously in this topic. I diagnosed that SC board was dead because:

Both plugged 4 blinks
SC-unplugged: 10 blinks
SS-unplugged: 4 blinks
Both unplugged 10 times

SC board had also burnt circuits. So I ordered another SC-board from ebay and installed it.. Now TV won't start but the led has changed its signal. Now it gives:

Both plugged 6 blinks
SC unplugged 7 blinks
SS unplugged 6 blinks
Both unplugged 7 blinks

According to service manual of TCP50G20 (not sure if the codes are the same in my model TXP50G20) 6 blinks mean SC energy recovery unit or A-SC FPC DET. Have you guys any idea what are those or is also my new (used) SC-module somehow faulty. Or do you know if there is any difference between SC-cards in models TXP50G20E and TXP50G20B.

What should I do next before I give my money to official Panasonic service guy?

I would be glad for any help.

Br
Joonas

[Jonkke]

Re: Panasonic G20 Failure :/

Hello from Finland,

Also my Panasonic TXP50G20 died last weekend. At first the led of death gave 4 blinks.
Then I started to diagnose the problem guided by instructions given previously in this topic. I diagnosed that SC board was dead because:

Both plugged 4 blinks
SC-unplugged: 10 blinks
SS-unplugged: 4 blinks
Both unplugged 10 times

SC board had also burnt circuits. So I ordered another SC-board from ebay and installed it.. Now TV won't start but the led has changed its signal. Now it gives:

Both plugged 6 blinks
SC unplugged 7 blinks
SS unplugged 6 blinks
Both unplugged 7 blinks

According to service manual of TCP50G20 (not sure if the codes are the same in my model TXP50G20) 6 blinks mean SC energy recovery unit or A-SC FPC DET. Have you guys any idea what are those or is also my new (used) SC-module somehow faulty. Or do you know if there is any difference between SC-cards in models TXP50G20E and TXP50G20B.

What should I do next before I give my money to official Panasonic service guy?

I would be glad for any help.

Br
Joonas

When I push the power switch the screen flashes for a second, goes black again and then the led gives six blinks.

[tom66]

Re: Panasonic G20 Failure :/

This is a common SC board failure, although there are also reported issues with the A board causing mis-diagnosis of 6 blink error.

[MyHD120]

Re: Panasonic G20 Failure :/

Tom, to your knowledge, do all the Panasonic Plamas have a Green Light
on the SS Board. I too, have the 10blinks, When i turn power on, my SC
board has a Green led that lights up, but not the SS board. Also my
A-Board has a Red light that comes up. Wonder if I have a Bad SS board.

Quick question: Do the green LED's stay on or fade out after a few seconds? Is the fading out normal? I have a long post with pictures coming soon but the answer to this question might help diagnose the problem. Thanks

[tom66]

Re: Panasonic G20 Failure :/

They should stay lit as long the plasma panel is being sustained (making a picture appear.)

[tw2005]

Re: Panasonic G20 Failure :/

It's possible the Sc you got was bad. just received a bad one from EMOS TV myself although I never installed it, just belled out the parts and found 3 transistors shorted and also suspect shorted SU board. And this was from someone with 20years in the business?

I have also had the displeasure of not checking the SU/SD boards for short and blowing a good SC TNPA5081 board. from what I've seen so far SOS6 generally ends up being a bad SC.

You could jumper SC50 , disconnect the buffer boards and confirm or meter out the board on all the large transistors and diodes for short.

watch out for the onboard green LEd to light on the SC if only for a moment. Have also had one of these go open and force a SOS6 but that would be a rare fault.

[tom66]

Re: Panasonic G20 Failure :/

Nobody in the business ever tests the boards pulled from TVs, other than attempting to power up the TV before they are pulled. If there are suspect boards they are sold faulty. You really think every used board supplier has a jig to test SC, SS etc boards?

[tw2005]

Re: Panasonic G20 Failure :/

Nobody in the business ever tests the boards pulled from TVs, other than attempting to power up the TV before they are pulled. If there are suspect boards they are sold faulty. You really think every used board supplier has a jig to test SC, SS etc boards?

Well there's a lot of liars out there then Tom if that's the case. Definitely claimed to have been tested and i even gave him a list of known FETs which go short on this board for him to confirm to which he simply referred me to google his business suggesting he knows what he's doing.

Does not take much to get the meter out and test for shorts. most of us here seem to handle that.

A fool I must be.

[tom66]

Re: Panasonic G20 Failure :/

Well there's a lot of liars out there then Tom if that's the case. Definitely claimed to have been tested and i even gave him a list of known FETs which go short on this board for him to confirm to which he simply referred me to google his business suggesting he knows what he's doing.

Does not take much to get the meter out and test for shorts. most of us here seem to handle that.

A fool I must be.

Testing transistors is fair enough, but I had a faulty SC board with nothing shorted, at all, still didn't work -- in the end, apparently one of the gate driver ICs is a common failure, but I'm not sure if that was the fault. Thing is, with a cracked screen, you can't tell if the SC, SD, SU, or SS are good, and a cracked screen can potentially damage the SU and SD. The only thing you can do to be sure is to install it in a known good TV.

[laurence1023]

Re: Panasonic G20 Failure :/

Hey every one when i turn my Panasonic TH-42PZ80B on the light flashes green then flashes red and it flashes red 7 times i have checked the ss board and the sc board when i unplugged one or both off them they flash for 7 - 8 times if you need to know how many times it flashes red when either one is discounted just ask would you lot know what is wrong with it?

[rmalbers]

Re: Panasonic G20 Failure :/

Nobody in the business ever tests the boards pulled from TVs, other than attempting to power up the TV before they are pulled. If there are suspect boards they are sold faulty. You really think every used board supplier has a jig to test SC, SS etc boards?

You are right, it's rare that people have the setup to test but there are some that do, like this place:
http://www.moduslinkptstvboards.com/
(I'm don't work for them or anything, I'm just saying if you look at this and compare with others (like you are talking about), there is a huge difference.)