Panasonic P50S30 No picture, power recycles

[Audioplus]

Panasonic P50S30 powers up and keeps recycling, no picture, can't turn off with remote except to unplug.
Is this a power supply issue or SC Board?

Thanks to anyone for assistance!

[tw2005]

Re: Panasonic P50S30 No picture, power recycles

It would not hurt to check out the SC board and measure the voltage from the PSU but I'm leaning towards A board. Could be a bad flash IC, I've had and A board do this, endless loop of restarts and I had a flash IC shorting out which was my fault as I had removed it but had a pool of flux trapped under it and it did some weird stuff until I cleaned it.

[Audioplus]

Re: Panasonic P50S30 No picture, power recycles

I won't have a chance to look at this unit until tomorrow. Do you have any idea what the voltage from the PS is supposed to be or will this be posted on the panel?

[tw2005]

Re: Panasonic P50S30 No picture, power recycles

I won't have a chance to look at this unit until tomorrow. Do you have any idea what the voltage from the PS is supposed to be or will this be posted on the panel?

You don't get that info any more from 2010 on for panel voltages. I'd expect a shutdown and error blink if it was bad or shorted. Endless restarts sounds like A board.

As a rough guide from a 42" 2010 HD

Vs = 191.5V
Vad = -190V
Ve = 125V
Vda = 55V

Then you have the usual 5V, 15V and then there's sub voltages from that that the A boards produce.

You'd need the manual and reading the schematics is hard as the quality is poor, block diagrams are ok I think.

[Audioplus]

Re: Panasonic P50S30 No picture, power recycles

TW, thanks for your input, have the unit, powers up with remote, red LED stays solid red and unit doesn't do anything, have to unplug to power off, same with manual turn on.
I did repost from scratch when I determined that it's not recycling or LED flashing, I'll have a chance to disassemble tomorrow AM.