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If you are getting video hum change the big lytics on the secondary side of the power trans on the PS board. My Zenith badged JVC had a lytic fail badly there...Picture was barely noticable behind the hum, audio was lousy with the HiFi cutting out regularly...I changed that cap (IIRC it was 2200-3300 at 16-35V) and it went from crap to a solid performer.
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