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Your post has been moved to the RCA forum to maintain forum organization and to make information easier to find.

IIRC, that model is a CTC169 chassis, a rather old set. These have probably a dozen different failures that I have seen that cause vertical collapse. There is no simple symptom-repair relationship that is very common that I can relate. Leaky caps, open caps, open resistors, bad diodes, bad transistors...these just need old fashioned get out the schematic and scope, trace the circuit troubleshooting. Not a good DIY project unless you have some TV repair skills and equipment. There are also several other common failure areas that I would be looking to do in these as preventative steps at this age. Several areas where there are bad caps and other issues. This could be a tough project if you don't know this chassis quite well, or even if you do.
 
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