Trinitron KV-32XBR35 Picture Goes Black, Sound Fine

[JPSanMo]

I am having issues with my Trinitron KV-32XBR35. When I turn it on, the picture comes on and then suddenly turns off after a little bit. Other times, the picture does not come on at all. However, the sound works perfectly.

Thumping on the side of the TV will cause the picture to come on momentarily. It used to stay on for a fairly long time after a thump, but now it is lasting shorter, sometimes only staying on for a second before going black again.

I am assuming it is something to do with the power supply to the picture tube and not the tube itself since the picture is perfect when it is on. Another idea I got from some posts Ive seen on the boards is that it may be overheating or have a faulty sensor that thinks it is.

Does anyone have any suggestions as to what the problem is?

Is this TV worth salvaging? What do you think it would cost to repair? Could I do it myself? I have a soldering iron and basic electronics understanding & skills.

I already bought a replacement, but am wondering how much time/effort I should sink into repairing this one. Should I just sell it? If so, for how much?

Any help is appreciated . . . Thanks!