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Agree 100% with Kf4rca on the tuner ground issues with these. As the miroprocessor-eprom controls everything with all service adjustments and tuner alignment via data to the LSI "tv-on-a -chip" these grounds will cause all sorts of intermittent issues. Unsolder the tuner shield on the bottom of the PCB and inspect / resolder all the tuner frame to board joints. These sets kept a lot of repair shops in business near the end of the line!
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