Quoted from mizzou:
Ok, got the solenoid and phantom switch issues resolved. I'm now noticing that the dmd is acting funny..certain animation sequences will just go blank half way thru (like the death star being destroyed) and I'll just be stuck with a blank screen for a few seconds. Other times it will just display the current rom version at random times (not when in holding both flippers for status check) would I be correct in assuming this is a board issue? Anyone encounter something like this before?
I had strange DMD behaviour on a Star Wars before .... garbage on display, stuff cutting out, freezing, blanking etc. Turned out to be a flaky ribbon cable. A new cable sorted it out.
In the first instance try reseating / swapping ribbon cable ends over.