Quoted from ForceFlow:

The video is a big help. It looks like it's dropping the tens digit occasionally--whenever the number is supposed to hit 6,7,8, or 9, the tens digit disappears.
First, I would try replacing the display EPROM. It's possible that the data where image data for those numbers are stored got corrupted/erased. If that doesn't work, then maybe also replace the game EPROM on the MPU (probably not likely to be the issue, but it's an easy issue to rule out).
With the game off, reseat the ribbon cables on the MPU, DMD controller board, and DMD. Again, probably not the issue, but an easy step to rule something out.
After that, I would guess there might be a possible logic issue on the MPU or DMD controller board, but probably more likely the DMD controller board. Do you have another working game you could swap boards with? That would be a quick way to see if the issue is on that board or not.

Quoted from ForceFlow:

Just as an additional thought, if it does look like the DMD controller board has an issue, the first thing I would try to test/replace would be the RAM. Whenever there's a weird issue on that board, more often than not, bad RAM seems to be involved.

Quoted from ForceFlow:

Just as an additional thought, if it does look like the DMD controller board has an issue, the first thing I would try to test/replace would be the RAM. Whenever there's a weird issue on that board, more often than not, bad RAM seems to be involved.