Nec PX-42VM5A Dead from Standby

[JohnCT]

Originally Posted by MIPS

I'm poking at this again.
I need to make room and it's last call on this panel before it's off to E-waste.

Any chance you had removed the rear cover and plugged it in? Pioneers have a trap switch that must be defeated once the rear cover is removed and the AC applied (or turned on depending on model). If that happens, there is a procedure to recover the operation of the TV.

You should be able to see the panel "prime" when turned on. In a dark room, turn the display on and see if you see a dull gray from the panel. It should be there and not flickering while the display is powered up.

If you suspect a wayward cap on the main or any of the boards, preheat the boards with a hairdryer or a heat gun (careful with that). Give a long heat soak getting the suspected board nice and warm over say 10 minutes. If you have a lazy cap, that will give the cap time to soak heat to the core. Warm caps are happy caps.

If the display powers up, power down the display and get an ESR meter and have at it. If you don't have one but have a scope, scope the positive side of all caps and look for a high waveform of noise. Even warmed up caps will show noise if they're weak. If you find one or many (most likely), hit them gently with some cold spray and and see if the waveform doubles - those are most likely the culprits.

John