Sounds like to me this is a High Voltage issue on the DMD controller board. Normally when you see that wavy background, the -112v and -100v drifted out of spec, closer to -130v and -118v, or even higher. Do you have a multimeter to be able to test these voltages to confirm?

If it turns out to be a voltage problem as mentioned, you can upgrade to a ColorDMD, which does not use these high voltages, which means you can skip repairing that part of the DMD controller board.

I beta tested the LED display for Party Zone. It has a lot of good color that works well with this title.

I have 12 ColorDMDs, and my scores always drop as I find myself looking at the animations too much when I play.