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Those Sanyo/Fisher sets are loaded with ceramic mini-modules, which have primitive foil-side mounted components. You might try tapping each one and see if you find a bad connection. If so, you can unsolder and remove the mini-module, and resolder all the connections on it carefully. Those caused a lot of audio and CRT drive problems. Also, the table model stereo Fishers with speakers mounted on the sides of the cabinet had problems with the speaker foam surrounds dry-rotting and ripping apart.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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