The DMD doesn't light because fuse F116 keeps blowing, taking out the 12 V/5 V feed the display needs. A previous owner had replaced the display thinking it was dead.

DMD dark and F116 keeps blowing: battlefield switches making the pusher run wild

Cause: A battlefield (mini-playfield) switch was triggering with no ball present, so the optos and the mini-playfield pusher went haywire and the pusher motor overloaded the fuse.

Checks

• Check F116 and the 12 V at the DMD supply connector before blaming the display.
• Watch the mini-playfield switches and optos in switch test with no ball up there.

Fix

• Adjust the mini-playfield so its switches only close for a ball, and clean the optos.

Systems

• WPC DCS

Games

• The Shadow

Related tips

• Switch matrix fuse F115 (F101 on WPC-95) blows as soon as it is replaced
• Fuse F116 keeps blowing
• WPC power driver board fuses and what they feed
• Which fault blows which driver board fuse (WPC-89/WPC-S)
• Finding whether a blowing fuse is a board or wiring fault
• F11 blows after a few games: shorted flasher leads on J122
• Flippers, mini playfield and optos dead with endless ball search: blown 12 V fuse
• F111, F112 or the line fuse keeps blowing

Source: Pinball Repair help group!! (Facebook group)