Hello, I have a jvc av27730. When the set has been running for awhile (heats up...few hours) the picture disappears but the sound is fine (possible zzzt sound). If you leave it on for awhile, the picture comes back up. Original fix, kids tapping set would restore the picture. Now, that does not work. The set works better when cold. I checked for cold solder joints, could not find any. No swollen caps, burnt components or abnormal board discoloration. Where do I start. A schematic would be helpful also.

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