My TZ does the same thing (but maybe not as loud as yours) after trying both a new Vishay and a Rottendog high voltage board. I don't notice it during play, but if anyone has any other suggestions, I'd love to hear them. I even tried a few different kinds of ferrites I got from work (placed on various ribbon cables, as well as the wiring at the speakers).

I had something similar on my Fishtales. The DMD was old and I replaced it with a fresh new vishay and its now all good

Just bumping this thread from 3 months ago in the hope that someone has a solution.

I have a pretty new DMD and I am not sure I want to spend the money on a new one on the hope that it might work.

I have a brand new DMD and I have the same issue in my SFII.

My guess is some sort of bad ground?

My only repair solution is to have music on in the background. :p

My IJ has sound from the DMD also the same as you described... I tried hooking up a different DMD to it and it still made the noise. Anyhow I am still looking for a solution also

I have read that tightening down all the boards in the backbox can sometimes fix this issue. This didn't work for my Tommy, but it's worth a try.

bumping this old thread...I have a DMD that is super noisy and trying to figure out the reason. No signs of outgassing or anything however if I throw in a new DMD the noise goes away. What on the actual DMD would cause this?

If the display is a Cherry, the only way to get rid of it is to replace it. They are notorious for being "buzzy". By comparison, a new Vishay is stone cold silent.

viperrwk

Depends on the machine too, DE-Stern Whitestars always hum and buzz to the display, no fix I'm aware of.

if b/w, it can be a no ground issue, but usually means the display is on it's way out, even if not gassing.

Resurrecting in old thread. I’m having an issue with my white water dmd. Very noisy. Changes with what is displayed. Grounds are good.