I'm having an issue with my RFM (wells-gardner k7302) monitor where the picture shakes when the ball is up in the pop bumpers, i.e. jostles/vibrates the cabinet. I've just done a complete recap and reflowed the solder on all of the header pins, but that still didn't solve the issue. I think, I've at least isolated it to a problem on the main board as I can replicate it when I lightly tap on it's mounting plate. I think my next thing to try will be replacing the flyback, but I wanted to check with the forums to see if there were other ideas out there before throwing money at it! Here is a video of the issue:

Thanks for pointing me to the HW circuit, as soon as you said that it made sense but I hadn't put it together. Found a cold solder joint on a capacitor, and reflowed.. bam.. issue gone. THANKS!