2011 Panasonic Viera TC-P50X3 50" plasma dead
 

No power at all. Removed back and metered both fuses and beeps on both. Do these have to be removed to test or is there something else I need to be looking at? No bulging caps.

I did also notice when plugging into outlet, there's a relay click but no lights or power.

Check the Mosfets in the PS for short.

Ok, thanks!

Only time I've ever had dealing with mosfets was in an xbox 360. Im a bit confused as I tested what I thought were mosfets but the only one that beeped on the multimeter was actually a shottky barrier diode. What should I be looking for on here? I think I'm missing something 😕

Probably it will have a permanent resistive load in the PSU (but only older PSU's have it), then the solution for testing is desoldering. Or, is a special MOSFET with a Schottky diode in antiparallel, normally used for syncronous rectifying.

So I should take it off the heat sink and remove from board before testing? It's a YG862C15.

According with the data, is simply a Schottky diode. But in doubt, desolder some terminal, or remove them. To be sure if is not a subsequent circuit having trouble (like a post buck regulator going do-do).

Ok, hopefully today, I can get around to it.

Would you be able to mark all of the ones I should remove as I'm not sure which ones to check?
https://flic.kr/p/2rDEQSL

Outrageously busy now but... you can measure all, note that Schottky will have a typical low value of measurement (in the diode scale of a DMM), like 80-160 (after some seconds for charging the caps), you can need to remove only the ones that measure far from it (eg. if one measures 30, or short - near zero). Ordinary P-N diodes will measure 450-700.

Ok, I'll check in the morning.

Ok, i tested all the "similar in appearance" components mounted to 3 different heat sinks and got the following readings from each:
204 - YG862C15
689 - K3607
2.793 - YG971S8
847 - 06N903
1.180 - K8A50D
961 - K8A50D
1.676 - K20A60U
2.746 - Y0972S6

Not sure if I did this right but I had my meter set to diode testing. Triangle pointing to a line.

At least none indicates shorting. In relay clicks, my fear is taht some another board have trouble. This is way outside my field since I changed the job just when LCD and plasma started to proliferate.

Yeah, alot of changes since crt design. Most techs never moved on.