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Hard to tell, but I'd guess it's a maybe a bad electrolytic in the video output or in the G1 lines. If you have a schematic, look for a low value high voltage cap (maybe 4.7 @ 160v or @250v, etc), very near where the G1 voltage goes to the CRT. It might be physically near the flyback, or on the CRT socket board itself. Just a guess here....
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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