I've been having trouble with my DH DMD and have exhausted all my options.

The photos show a couple examples of the issue.

Random rows on the DMD light up and images are often garbled or refreshing slowly.
The DMD also hums quite loudly, especially when I screen test the rows. Columns don't hum.

The backbox includes brand new boards for MPU, Power Driver, and DMD Controller and all have been tested to be working.
I've swapped all serial cables and the DMD with my Judge Dredd, and everything works fine over there.

The game "thumps" pretty hard when I turn it on and it kind of lets out a short buzzing "whine" when I turn it off. The game plays as normal. The issue only shows up on the DMD. And the loud sounds when turned on and off.

Beyond my very limited troubleshooting capabilities at this point. I've had a couple technical friends chip in, but they're stumped too. A grounding issues was suggested, but don't know where to go with it.

Any help, advice, ideas would be greatly appreciated.

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Thank you, I did try the applicable recommendations and everything seemed to check out.

I skipped the tests on the DMD controller, MPU, and power driver. The DMD controller and power driver work fine in JD and a friend tested the MPU in his DH and it worked okay.

The vast majority of recommendations revolve around those three boards, but they're not the issue

Added a video to show the problem and you can hear the buzzing of the DMD.

The knocker even seems to jump slightly when the machine is turned on.

Measured the voltages going into the DMD and they check out.

I have a new rottendog dmd controller and it produces the same problem.

The DMD works perfectly with no errors in JD.

The same applies to the MPU, power driver, and DMD controller. They all work perfectly in JD. (A pleasant unplanned benefit of owning two WPC-S pins.)

It has to be one of the other boards or something else altogether?

Thanks! I did swap the ribbon cables, but the problem still persists.

Someone suggested that I put the JD DMD into DH. I did put the DH DMD into JD, but the DMD worked perfectly in JD.

I don't know much about testing for AC ripples... any pinball related links to learn more? I googled around but didn't find anything helpful.

I have tested all the voltages that I could on the power driver and DMD, but they all checked out.

That aligns with my concern...

The machine "thumps" pretty loud at the start and it seems get a power surge every time the machine is turned on.