A few more clues before I call it a night:
I'm getting a response from the brightness control. When I decrease the brightness, the flyback starts clicking like mad and fills out the screen, somewhat. It more flickers with each click. The picture does grow larger. The picture was shrinking when I increased the brightness before I started.
Also, now the flyback is ringing at me. I'm not sure what that means, or if that makes sense. I took a video of it.
I'm noticing that, when I stick a screwdriver near the flyback ring, small blue sparks jump to it. I think that's normal, but maybe not? Maybe I need to treat the flyback with some corona dope?
I decided to stop taking voltages since I wasn't sure if the ringing was dangerous. I measured two of the three sources, and noticed they were actually running about 10 VDC higher than they were supposed to. I'm not sure if that's within tolerance or not.
https://www.youtube.com/watch?v=A3hx...ature=youtu.be