Quoted from Hawk007:
aww too bad someone close to you or yourself does not have another dmd to try or dmd controller board. I bet its the ram on the dmd controller board. If your not going to repair it swap the controller first.
Seen that lots. Same as bad caps but that usually causes rolling. Cables are number 1 and as you tried reseating them along with replacing them so we can rule them out.
Little tip......make sure your dmd controller is 100 percent before plugging in your new display!
no sense potentially hurting a new display..
Good luck and cheers
My stuff arrived a day early, so I just got it installed. I replaced the DMD controller first as you suggested and it does appear to have resolved the vertical lines!
Removing the old controller and getting a look at the back side makes it pretty apparent that there's probably a failure in the lower, high voltage section. The PCB looks pretty crispy.
After replacing the controller, the DMD was still making a high pitched squeal and I can't remember if it's normal or not. No matter, because I also installed my new ColorDMD! It really does make this old game seem new again and I'm quite happy with the purchase so far.
I managed to fix a few other problems it had tonight too, so I think it's officially playable now! One thing I'm not sure how to fix is that it almost always kicks 2 balls out of the trough to start the game instead of 1, but I'll start a new topic for that.