There's possibly an issue with a fuse blown. The serial number and machine build could be in the era of it being either a fuse and or a on with analyzer functions. Any way to switch out a display with a known good one? To eliminate harness... etc. have had 2 in about 1k machines that all of a sudden just quit working. Maybe just best after the troubleshooting doesn't find the issue is replacement. That was our 2 repairs to resolve the issue.