I repaired over 100 of these T-815 Magnavox sets when they were younger. Trust me, it's not considered an early solid state set.
The only thing your set has that I didn't see often is the stand-alone audio amplifier.
We've all suggest things to check on it for you, but you only come back and announce that something else is wrong. Replacing a single capacitor won't fix but one thing, friend.
Did you actually go through the chassis and re-flow solder on the chassis ground connections, and check the stakes that the plug-in boards connect to? Bad factory soldering was most of the problems I ever saw on the T-815.
Also, check the plug-in boards for bad soldering especially the board plug connectors.
Use a magnifying glass and a bright light to examine the soldering. You will see crack marks around connections. Use a small soldering iron and some decent thin solder to add a tiny amount of new solder to whats already there.
Be slow and thorough with your work.
THE END.
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Bruce
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