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Power supply is my initial thoughts, but then again it could be that one of the three CRT's tubes has an issue. My thoughts is that it would be best to bring it to a good TV repair shop. Why spend money on a power supply and then find out it's a CRT. Blessings, A/V Media Guy
you have a high voltage arching problem. the crt has about 33000. (thirty three thousand) volts on it. the anode lead is arching to the chassis(ground) around the crt(picture tube). the anode lead is the big red wire on the very top of back of crt. with the back off, you will see the big red wire and it will have a suction cup about 4 inches round connecting to picture tube. unplug. silicone around suction cup. let dry for 24 hours. enjoy. you might get a little shocked even when unplugged, but wont hurt you.
The set has gone into protective shutdown. This is to prevent further damage. The most common part failure is hte horizontal output transistor. This is a 3-legged part attached to a heat sink close to the flyback transformer (part with large red wire coming out of the top). Try replacing that part.
Keep us posted.
These RCA televisions are notorious for this problem. You will need to
have a technician change a chip called the EEPROM which
holds the memory settings. The memory gets corrupted and the chip needs
to be replaced or reprogrammed by unsoldering it, removing it, and
inserting it into a device. After this is done it can be reinstalled
and your sound will return.
Sorry, that is common for generic replacement xformers for
your make / model . There are some adjustments to minimize
the effect in servicer menu...............you can try turning down the
screen control a bit....................T.