The dot-matrix display keeps resetting over and over, even in attract mode. The 5 V at the display controller is good and the same happens with a replacement LED display.
DMD keeps resetting in attract mode: torn ribbon cable at the display controller
Cause: The ribbon cable to the display controller board was torn where it plugs into the controller.
Checks
- Measure 5 V at the display controller and replace its power header and connector if it is low.
- Note that the display's 12 V feed is unregulated and reading around 17 V there is normal.
- Inspect both ends of the display ribbon cable closely for cuts or tears, and try a known good cable.
Fix
- Replace the damaged ribbon cable.
Systems
Games
Related tips
- 192x64 display EPROMs must be 120 ns or faster
- Dot matrix controller CPUs by display size
- Display freezes or shows garbage after warming up: reseat the display controller ROMs
- Frankenstein: CPU and display EPROM types and latest versions
- Setting up a replacement 192 x 64 display
- Large 192 x 64 display blanks or resets (Sega bulletin 106)
- Install kit 500-6326-00, part 2: display controller end
- Running the large display on the bench
Source: Pinball Repair help group!! (Facebook group)