1980 Sears (Sanyo) 25" Console TV CRT Problem

Originally Posted by Username1

well, with the service switch on, there should be less current drawn on the tube. I imagine also as the picture gets dark, hv would go up, and the tube would spark again... does the hv go up on dark scenes? Maybe you should tone it down a bit?

I tested the HV with the brightness/contrast at minimum, and it was a very steady 29KV, which is what the tube was rated for (29-30KV.)

The only adjustment for HV was a 3 position jumper; Normal, High, and Low. It was on the normal pin.

The snapping happened at random, mostly on bright scenes.