Racking my brain on this problem. Turning to the forum for thoughts. Hopefully someone has been through this

Problem: Stern NASCAR has been playing without issue for many years. Turned it on and the DMD is displaying garbage (see pics). Game will start and play without issue but the DMD stays garbage.

Troubleshooting To date:
- Swaped displays. Same thing happens with a different DMD
- Checked voltages on Display Power Board. All good.
- Absolutely no acid damage. Game was HUO and clean as a whistle.
- Reseated and checked all ribbon cables. Swapped ribbon cables. Same thing occurs.
- No visual issue on the display controller board.

I don’t have another stern to try swapping the display controller. The 5v to the display driver is good.

Thoughts?

Dave

FDA4FBFB-5505-43B0-A2EB-B19C43D6294F (resized).jpeg

CD2A5473-7899-47A7-8EB4-DBB401505868 (resized).jpeg

Yup. Removed the batteries and the holder (cut the zip tie). Not a trace of acid.

Voltages are as follows:
-110v
-97v
5v
67v

By what I see from the attached, the voltages are close to “nominal”

Dave

AAA9DFE9-FFB1-4C68-8373-8717D3CD8AD4 (resized).png

FDB476A5-FBE7-4C31-976A-680C3044FBEC (resized).jpeg

5v is good to the Display Controller Board. Checked voltage at connector on board 4.95v and 5v led illuminated on Display controller board.

When I swapped the DMD I only swapped the display and used the old display controller board as this is my only stern so no other game with a similar board. The DMDs and ribbon cables I could use from my Williams.

I also checked both the 26 pin ribbon and the smaller one by swapping with no change.

Just trying to get a second opinion before I order a new display controller board. Also, I see they are $220 at Marco for a stern board but looks like Ks sells a rottendog version for $140. Anyone had any experiences with this rottendog Board?