Quoted from desertT1:
My Dolly Parton was working just fine yesterday and today it's doing something I haven't run into yet. Each digit of the display that should show some info (and maybe even some that wouldn't normally) was showing a "3". It has an Alltek MPU, so I'm hoping that isn't where the issue is, but since it is on all 5 displays I wouldn't think it's a chip on a single display.
you can also try just one display at a time to rule out a problem display effecting the rest of them. otherwise connector problem at MPU J1 seems likely. also make sure no switches are shorted. you can unplug the switch connectors on the right side of the mpu to see if the display issue clears with them off.