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RCA tv's of that era had a thermistor behind the chassis go bad. The big problem is you have to carefully pull the chassis. I have, in a pinch, replaced the thermistor with a resistor as it has not been available for a long time. This thermistor will kill vertical and audio.
Can you get me the chassis (CTC) number and I'll pull the schematic and see what the value is
Sorry to say I'm in New Orleans so I can't make a house call there.
The setup switch does give trouble but as mentioned earlier, does not affect sound.
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