[TinCanAlley]

Originally Posted by andy

It's not unusual for the ground wire to act like an antenna and pick up signals from things like the flyback and yoke. It looks to me like you have ringing on all of those signals and voltages. It could be a filtering problem, but I think the ringing itself is the problem.

What voltages to you have on the 240v and 750v boost sources? If one of those is low, it could explain the lack of a bright service line, and be causing the bars.

These types of problems can be real head scratchers and often end up being the last thing you would suspect. It could even be the yoke or flyback. You might want to look for a parts donor in an ugly cabinet. A whole chassis transplant isn't a crazy idea if you value your time.

Those voltages test out as 248VDC and 761VDC. So their not on the low side.

I was hoping someone could look over the schematics I posted earlier and tell me what happens when the setup switch is activated. To me, a beginner, it looks like it does something and collapses the vertical. That's my best guess based on what I get looking over the schematics. If that's what's happening, then the lack of setup line for all but a faint blue is puzzling.

If it comes down to replacing the FB or yoke, I'll live with the bars. I don't want to get that involved. I think for the heck of it I'll look over all the caps and resistors in the 750V boost area. Could be a decoupling cap.