Mitsubishi WD-52825 hum bars on ext inputs

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docaudio
Mitsubishi WD-52825 hum bars on ext inputs

Thankfully this TV has not exhibited the BGLOD so far, but has developed serious hum bars on all external inputs - Componet, s-video. (Haven't checked HDMI yet)

It is heat related, when first turned on the bars aren't too bad, but after  20-30 minutes, the TV is pretty much un-watchable.

OTA antenna input is good and DVR recordings are good (even if sourced from an external input) ??? Weird..

I have the service manual, and have board level repair knoweldge.  I also have a dozen or so 1000mfd Panasonic caps ready to drop in, thinking I had power supply issues, but after searching the posts here, I'm thinking I have more to do.

The service manual shows basic disassembly, but no componet layout or schematics. Hopefully someone has the additional info available here on which board to go after and possible parts to check and/or replace.

Thanks in advance,

Bill

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