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That set looks like it uses the 9-160 power supply module. These modules were prone to having poor solder connections. The edge connectors on the module were prone to develop intermittent connections.
You'll need to pull the module and resolder pretty much everything on the board. Pay special attention to the flyback transformer, power resistors, and the big diodes that come off the flyback transformer.
Clean the edge connectors with contact cleaner.
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