Hi everyone,
I'm having a problem with the digital display on my Bally Night Rider machine. I just got this machine up and running after many years in storage. The back cabinet had been disconnected and separated from the lower cabinet. I cleaned all the wiring harness connections that had been disconnected and re-connected them. Everything seems to be working fine except the thousands digit on all four player screens does not light up. Seems as if it might be related to a power issue for that particular digit.
Can anyone lead me in the right direction to troubleshoot and repair this issue?
Any help is appreciated!
Thanks, Tom

Thanks for your replies. I found a dirty connection on the MPU which corrected the issue of the missing digit on two of the displays. It turns out the displays for player 3 and player 4 are missing more then one digit. I cleaned the connections at the displays but it didn't help. I removed the displays and looked at the circuitry but couldn't see any issues. I'm thinking it's a problem with the display circuit boards. Any thoughts?

Thanks!