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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.
It actually comes of the tube, it is just clipped in there. Warning!! before you do this, rig up a small screw driver, tie a wire to the metal part, on the other end of the wire hook up a alligator clip or a clamp, the tie a really long wooden handle to the screwdriver. You will use this to discharge the tube safely. The picture tube carries enough charge to kill you even after it has been turned off!!! The lethal charge can remain in it for up to three days.
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.
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.