Panasonic Viera TH-65PZ700E shuts down when warm

[dicky96]

Hi guys
I have this beast of a TV in my workshop, it's soooo bloody heavy I can't lift it onto a workbench

When switched on it runs for about 40 minutes then shuts down with a Red flashing LED on the front

You can press the power button and it will flash green and power up again for a several seconds or maybe up to a minute, then shut down again.

Cooling down the two PCBs near the centre, which both appear to be PSUs, didn't seem to make any difference.

I cooled down the PCB on the right (looking from the rear) and then the TV ran for 5-6 minutes before it shut down. That PCB is marked TNPA4012, one of the Sustain Boards.

Assuming I determined the faulty PCB, Are there any common causes of this fault, otherwise i can get a replacement board inc postage for about 50 euros if the customer wants it fixing.

Pics of the behemoth........

[dicky96]

Re: Panasonic Viera TH-65PZ700E shuts down when warm

Additional info
It originally ran for about 40 mins with the back on. This is what the owner reports.

The four cooling fans are spinning.

[Diah]

Re: Panasonic Viera TH-65PZ700E shuts down when warm

check all Fans , if one spinning slow it will go to protecting mode. clean them and oil the shift of them.

[dicky96]

Re: Panasonic Viera TH-65PZ700E shuts down when warm

Good call - definitely the single left hand fan had a problem.

I noticed it was lazy when spinning up then it went up to speed so I didn't think any more of it. I cleaned it and it ran for about 20 mins then shut down.

Now I can see when I power up the TV the other three spin up but that one is just twitching. It's not the bearing, the fan spins freely if you give it a push. I replaced it with a PC fan and it's running now. I'll leave the TV on and see what happens

Cheers
Rich