Recently acquired a Who Dunnit I am working through getting to 100%. Lights, switches and mechs are all working correctly.

The last issue is the DMD. It tests fine and is bright. However there are missing elements to dmd graphics for certain “shades” or intensities of the pixels.

For example, when choosing a suspect their names do not appear under each character. The Who Dunnit logo is partially “hollow”. The Bally logo is missing the drop shadow ect.

I have reseated ribbon cables and replaced the ribbon cable from the driver to the DMD.

Just went from .4x to 1.2 problem still exists. New ribbon cables.

Display test passes.

It’s some type of issue where the signal for those particular shades aren’t making it to the DMD.

All of the dots work. Since DMD’s are a monochrome “shades” are rendered by the luminance of the pixels.

A specific range of that luminance isn’t being sent to the DMD

Swapped DMD, issue still present

Even with the colordmd it was missing colored areas.

Problem traced to aftermarket xpin xp-WPC-ctrl dmd driver board.

Thank you to all who tried to help resolve the issue.

Was in the machine two owners ago. I would prefer to put a correct original board back in.

Machine fixed with a WPC DMD board.