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if its got no snow at all and no noise at all just a snow free blank raster, then I would check the osc tube in the tuner. But as mentioned it could be a lot of things, but for starters the tuner and the IF tubes would be a good place to start. Some times just wiggling tubes will bring it back to life as oxidation on the tube pins can interupt the circuits.
it really should be checked over for things like HOT current as leaky caps can cause damage to parts that are hard to replace. that being said, zeniths do hold up well and typically require minimum cap replacement.
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