Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

[TJGarltic]

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

I need help also on my P50S30..replaced sc board..got full picture and sound but ribbon cables were not making good contact with su/sd boards on a couple connectors..tried to reseat one and set shut off and went to 7 blinks.. now have su/sd isolated, jumper on sc50 and i get sound and set lights up..once i connect either buffer, 7 blinks...freshman here so please be gentle

Did u ever fix this cuz i have exact same issue. Done isolation test and sc board is good.

[TJGarltic]

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

Did u ever fix this problem cuz i have exact same issue?

[foxyUK]

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

The driver chips and transistors will also have shorted--Killing the new parts.

I use a 100W inky bulb, 240V in series with the Vs supply in an attempt to prevent failure of the new parts when checking for failed driver chips and transistors...

I was wondering whether a 300w limiter on the mains input would help to protect Vsus shorts (on the 42" sets it seems to blow the P board FETs and slow-blow fuse when the SC IGBT's go)... but then found your tip here, which sounds more promising. Guess you have to cut a Vsus lead and fix afterwards?
Do the sets work normally with that small voltage drop, if no shorts?

[Moreno83]

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

Hello, I am hoping this would be a good thread to get some help with my Panasonic Viera TC-P55ST50 television that gave me the 7 blink code yesterday.

I took the back panel off, and tested the resistance on the connector pins of the SU and SD board following this video: https://www.youtube.com/watch?v=_oX8hMcXjWg

And found that the SD board had multiple pins shorted out on two connectors. I ordered a new SD board (part # TXNSD1REUU), but I want to check if the SC board is bad as well. I tried to find a service or troubleshooting manual that may go over this process but was not successful. Can anyone point me in the right direction on how to do a resistance test to see if I should replace the SC board as well?

Thank you!

Just measure the fets near the buffer boards. They are in the same area as DAF30. ( top side of the sc board ).
You probably only have a shorted buffer board.

[bantambourg]

Hello, I am hoping this would be a good thread to get some help with my Panasonic Viera TC-P55ST50 television that gave me the 7 blink code yesterday.

I took the back panel off, and tested the resistance on the connector pins of the SU and SD board following this video: https://www.youtube.com/watch?v=_oX8hMcXjWg

And found that the SD board had multiple pins shorted out on two connectors. I ordered a new SD board (part # TXNSD1REUU), but I want to check if the SC board is bad as well. I tried to find a service or troubleshooting manual that may go over this process but was not successful. Can anyone point me in the right direction on how to do a resistance test to see if I should replace the SC board as well?

Thank you!

[mpcgsy]

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

Hi

I also get the screws from Farnell - 249-4525 (approx. 6.5p per screw if ordering 100+)

Cheers

Mike

[mpcgsy]

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

Hi

I get my IGBT devices direct from Panasonic - only about 80p each.
(p+p £3.50 per order)

Regards

Mike

[Behemot]

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

Similar here, those who had that usually want another one.

[Moreno83]

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

There is a big demand here for Panasonic plasma's. Strange "nobody" in the USA likes plasma's anymore?

They all go for the cheap wallmart tv's?

[freakaftr8]

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

Im glad that they didnt! Thanks to this problem i sold many plasmas haha.

I know right! Then I wouldn't have 5 Panasonic plasmas stacked up in my house waiting on repairs if I want to do them or not or just part them out because I don't think I'll sell them for a profit.

[Moreno83]

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

Then you are lucky because most of them are fakes.

[Behemot]

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

Of ali, seems almost like they've been reused, from the appearance.

[Moreno83]

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

If you ever put your hand on the back the plasma display panel after it's been on for a while, you will notice the massive amount of heat being generated off the back of the panel. This causes undue thermal stress to the screws that are holding the boards on. Also expands and contracts the lugs that the screws are screwed into. Fans installed or not..

What Panasonic should have done, Along with other manufactures would be to have each floating ground tied together in some way so if one lost connection the other one would make up for the lost connection. That essentially would save a lot of boards from ill certain doom.

Im glad that they didnt! Thanks to this problem i sold many plasmas haha.
Where did you get the 30F131? Thought there were only fakes?

[freakaftr8]

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

If you ever put your hand on the back the plasma display panel after it's been on for a while, you will notice the massive amount of heat being generated off the back of the panel. This causes undue thermal stress to the screws that are holding the boards on. Also expands and contracts the lugs that the screws are screwed into. Fans installed or not..

What Panasonic should have done, Along with other manufactures would be to have each floating ground tied together in some way so if one lost connection the other one would make up for the lost connection. That essentially would save a lot of boards from ill certain doom.

[Behemot]

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

Have you noticed this thing actually has fans? FOUR of them? Plus the metal frame is the most massive one I have ever seen. No wonder the thing is heavy like hell! How can that actually undergo any mechanical changes? Besides, ALL of the screws of all boards were so screwed. That's clearly from the factory as it is definitelly not stressed equally on every place.

[freakaftr8]

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

Your desktop displays are not mounted against a back of a plasma display panel that is of self emmissive technology. Couple that with the fact that the sustain boards undergo a tremendous heating and cooling cycle, Against another sheet of metal that also goes under heating and cooling cycles at infrequent times, So yes the screws no matter what you put in there will back off eventually. No amount of thread locking compound is going to fix that problem.

When they build an engine for a car that uses a cast iron block and aluminum heads the bolts at hold the head down no matter what eventually loosen up and blow a head gasket. This is due to Infrequent and inefficient heat cycles between the block and the head because the head being made of aluminum gets hotter much faster than a block does. Similar situation

[Behemot]

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

Excuse me, but that does look like BS. I've had way too many ordinary desktop displays in my hands, and no matter what type of screws it had, I never found any so loose as most of them here. Why this TV should be any different and the problem should be in the screws themselves?

[NYKing]

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

Replacing three RJP30H2A and three 30F131 seems to have done the trick for me. I've also refreshed the leayer of (leaded) solder from both sides of the board under the screws and tightened them properly. Most of the screws on all the boards were not tightened really firmly, if that happenes so often, that makes me wonder whether them Panasonic engineers are idiots (don't think so when they managed to make the rest of the TV), or it was deliberate.

The OEM screws get loose over time so you should get locking screws instead:

http://www.shopjimmy.com/panasonic-x...-screw-kit.htm

Probably a cost cutting measure to use the cheaper non locking screws or not hiring good QA people at Mexican plant. Blame the accountants/executives lol

[Behemot]

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

Replacing three RJP30H2A and three 30F131 seems to have done the trick for me. I've also refreshed the leayer of (leaded) solder from both sides of the board under the screws and tightened them properly. Most of the screws on all the boards were not tightened really firmly, if that happenes so often, that makes me wonder whether them Panasonic engineers are idiots (don't think so when they managed to make the rest of the TV), or it was deliberate.

[Behemot]

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

Removed the board, it was arcing almost under each single screw to the point the solder oxidised and turned black. All three of the power FETs are shorted, so which kit or components should I grab to ensure everything else whch may also be bad is OK now?