Start by removing the display ROM and reseating it. Do you have an EPROM burner?

It’s a 6264. Try swapping it from a display board or CPU board from another game and see if it clears up the issue.

Yes, but from my experience these would cause full scenes not to display and show “display override” errors as the display receives bad commands.

There are small variants but I was told all 6264s are cross compatible. If you had other DMD games you could just buy NVRAM for one of your other games and put the old 6264 chip in your display.

Not in this case, his issue is with regards to the actual pixels on the display. The MPU can only send commands to display a scene, a number/letter, or blank the screen.

It looks like all 4 jumpers control the brightness, and each jumper represents a bit in a 4 bit value for brightness.

No problem, I've never actually seen one of these Boston Pinball displays until now. Just a guess (but it could be one level of brightness for each jumper too).

It’s looking like that so far.

Ask for a refund from Boston Pinball.

Well you may be out of luck then. Check out this thread, I would vouch for the excellent color DMDMK66 display.

https://pinside.com/pinball/forum/topic/dmdmk64-new-dmd-multicolor-by-pinballsp-is-on-the-way