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That TV is one of the most troublesome of its time. Sylvania made that set for RCA as well so you may see the identical TV with an RCA label.
The top PC board is a source of bad solder joints, poor quality components and bad ground connections. The heat from the sweep circuits cooks the PC board and its parts. The board material is very fragile and the conductor will easily separate. Make sure the PC anchor screws are tight on the supporting rails as they provide a ground path.
Carefully flex the board and look for changes. Allow plenty of time.
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