Panasonic TC-P50G20 Problem

[sprocket]

I'm trying to help a friend fix a 50" Panasonic TC-P50G20 Plasma TV that gives the 10 code when plugged in

This is my first time with a Plasma and don't fully understand what board does what

I have gathered some good info on it and tried to pin down which board is bad by using their procedures and things don't seem to happen the way they explain it

I also have taken voltage readings from various places and have those

I could use some help getting the right board at the price they cost

Thanks in advance

[tw2005]

Re: Panasonic TC-P50G20 Problem

A little light on info. Explain what you have tried and your results.

Most likely though is shorted Vsus on the SC board, that's the most common fault and the buffer boards may be shorted too and will need checking.

Like most Panasonic SC boards they're scarce to find at times, you're definitely going to pay what they cost and not cheap at the moment unless you have component level fault finding and soldering of small component skills.

i have repaired three of these boards yet to see anyone else have a go and also repair there's . A few have started but did not come back with any results.

I assume your SC is TNPA5081AF , these too will work TNPA5081AP, TNPA5081AW not that improves what's for sale but at least you know if any of these pop up you can use them.

[sprocket]

Re: Panasonic TC-P50G20 Problem

Correct it is a tnpa5081af

first plugged in I get 2 clicks and then the 10 code
unplugged P2 to SC and P11 to SS and still 10 code
unplugged P35 from PB with the 2 above still unplugged, still 10 code

checked vsus and vda for short to ground and found them not shorted

I have a flash of the 15v on pin 7 of P6 and 15v from drain of Q355 and 100+ on P2
These are very brief and then shuts off

I might add that the green leds on both SC & SS light a little and the fade out

[tw2005]

Re: Panasonic TC-P50G20 Problem

Try disconnecting SC20 ribbon from the SC

[sprocket]

Re: Panasonic TC-P50G20 Problem

10 code

after the 2 clicks and shut down, if I press the power button should I here a click (relay)?

I don't

[tw2005]

Re: Panasonic TC-P50G20 Problem

This one could be A-board. I'm thinking of suggesting disconnecting all flat ribbons from the A that go to the C boards and the SC, all power from the SC & SS, disconnect the power that feeds the c buffers, disconnect anything connected from the SS to the C board.

If still 10 A-board would be a real possibility but there may be a flow chart to follow.

If the 5V is shorted that can trigger 10 blink too.

I have done the above on a 2010 HD model to prove the A-board and under this conditon It simply powered on. No display of course but took the opportunity to measure the PSU which was all good.

Have not done it on this model though.

[tw2005]

Re: Panasonic TC-P50G20 Problem

Have you got the Service manual?

Also this is a generic list from a training guide for SOS10

Abnormalities of the F+15V.
 Reasons:
 The P board is not generating the F+15V
 SUB Voltages are affected by the K board or by
metal object present in the SD card slot..
Shorted Vsus (By the SS board or SC board).
Shorted Vda (By the panel, or any of the C board)
Wrong diagnostic by the A board.

[tw2005]

Re: Panasonic TC-P50G20 Problem

Try this guide although 42" it's FHD and same generation,

Just following what you said it sounds like you may be following the flow chart anyway?

[tw2005]

Re: Panasonic TC-P50G20 Problem

I've got a TNPH0893 out of a US GT25 same panel and boards otherwise. Not sure how close it will be to your 0834 for onboard comparison??

Can't hook it up though, I don't mess with mine now, MRS don't like me messing with it for testing anymore.

[tw2005]

Re: Panasonic TC-P50G20 Problem

10 code

after the 2 clicks and shut down, if I press the power button should I here a click (relay)?

I don't

Not sure, when mine shuts down after a couple of minutes the relay clicks. That's normal shutdown with the remote into standby.

Mine is set to last state if the power fails so with the master on if it blacked out, when power resumes it auto starts. If it was off at the time in standby, it would remain in standby.

[tom66]

Re: Panasonic TC-P50G20 Problem

That is normal behaviour for Panny's, I think they do it so they can download a DTV guide update or firmware update over the air if there's one available, my PZ80 clicks on about once an hour for 20 seconds to do this.

[tw2005]

Re: Panasonic TC-P50G20 Problem

That is normal behaviour for Panny's, I think they do it so they can download a DTV guide update or firmware update over the air if there's one available, my PZ80 clicks on about once an hour for 20 seconds to do this.

Really, I know if I'm silly enough to stay stuck on this forum into the wee hours of the morning mine does that for an update at 3am. never realised it was hourly but then it's on when we're home so that'd be why I only notice it whenn all is quiet.

[sprocket]

Re: Panasonic TC-P50G20 Problem

I tried undoing ribbons etc and power won't stay on, still 10

I have what I could find for a service manual. but with all the revisions etc, I'm sure they are accurate

One walked me down to disconnect A1 and asks if it shut down with a 10, that removed power to the K board blink led so I had no idea

I'll check out the 5v tomorrow and let you know... thanks for all your work

Yes I have that manual and tried to follow the chart but just does not calculate

[tw2005]

Re: Panasonic TC-P50G20 Problem

I would hardly call it work. pretty boring sitting here with nothing to comment on . Anyway not sure how much more I can help but I can say that I induced a 10 blink caused by the A-board when the 5V line was shorted by a couple of octal buffer ICs. Blew them twice to get sos 10. Long story but was a very bad TV with corrosion and shorting SC20 ribbon.

That was SOS10 with everything disconnected but don't get your hopes up it's the same but maybe elsewhere.

[sprocket]

Re: Panasonic TC-P50G20 Problem

Thanks again tw2005 for your help

I'm reporting back on the results

Even though I had the brief 15v etc. the digital never had time to reach full readings so I spaced it off as that

I done some more checking and jumping and found what I thought was a bog down (just couldn't produce the amperage) in those voltages, so I ordered and got a Power Board and BINGO that was it

[tw2005]

Re: Panasonic TC-P50G20 Problem

good result considering the A board would have been impossible to find. Don't see too many PSU issues either normally.

[SpinMaster12]

Re: Panasonic TC-P50G20 Problem

For my TCP50G20, I have verified that all of my components are good, however the last SC board I put into the TV blew out. Could the actual plasma panel possibly be responsible for shorting the SC boards? And if so, is there anyway to test the panel itself?

[Borghi]

Re: Panasonic TC-P50G20 Problem

I have a TCP50G20 that has 4 blinking lights. According to what I have read, it is probably the P board, but may be the A board. Any suggestions on how to pinpoint the cause??

[tw2005]

Re: Panasonic TC-P50G20 Problem

I have a TCP50G20 that has 4 blinking lights. According to what I have read, it is probably the P board, but may be the A board. Any suggestions on how to pinpoint the cause??

Most likely SC board, stick to one thread otherwise all the replies will be scattered

[GuyTV]

Re: Panasonic TC-P50G20 Problem

I must stress the fact that the TNPA5081AP will not replace the " AF ".
The SC41, SC46,& SC42 are made different. They don't fit on the SU & SD boards. If one wants take a chance in interchanging those connectors, you can try that. I have bought a "AP" to replace a defective "AF" , but I don't want to try the interchange. I will not risk blowing the SC board I just bought.
Interchanging the connectors might work. It's at your risk.
It is almost impossible to find a reliable seller for a "AF" board.
I will rebuild the the two bad "AF" that I have here. I did a couple B-4 with success.