Right after a new clock driver board is installed, the colour LCD display (an aftermarket DMD replacement) flickers and goes completely black, though the game still plays and 5 V reaches the display controller.

Display goes dead after fitting a new clock board: check fuse F116

Cause: The 12 V fuse F116 had blown. The display needs 12 V as well as 5 V, and the fuse was hidden behind wiring so it was missed at first.

Checks

• Measure all the driver board test point voltages, including 12 V, not only the display's 5 V.
• Find and test every fuse, including ones hidden behind wires, with a meter.

Fix

• Replace F116 with the correct slow-blow fuse.
• If it blows again once the clock board is reconnected, look for a short on the new clock board or its wiring before fitting a larger fuse.

Systems

• WPC Fliptronics

Games

• Twilight Zone

Related tips

• F116 blows a few seconds after power-up with a new clock board: uncut header pins
• Sound and DMD controller fuses (WPC-89 and WPC-S)
• DMD dead though display and controller work in other games: CPU board fault
• No coils, lamps, GI or flashers but display and sound work: check blanking
• Opto still dead after replacing both sides: the new transmitter can be bad
• WPC-89/WPC-S driver board fuse ratings

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