Starting a game fires every flipper briefly, then none work.

All flippers kick once at game start and then go dead

Cause: A flipper switch board connector is unplugged from the Fliptronics board (CPU board on WPC-95), so the game reads every button as pressed and the secondary 50 V fuse blows.

Checks

• Check the flipper opto board connectors are plugged in.
• Check the flipper fuses.

Fix

• Reconnect the boards and replace the fuse.

Systems

• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)
• WPC-95

Related tips

• One flipper dead and its button fails switch test: dirty flipper button opto board
• Upper flipper sometimes weak, then buttons dead after cleaning: replace the flipper optos
• Fliptronics flipper does not work: test the flipper opto board
• How Fliptronics flippers work
• Checking flipper buttons and EOS switches in switch test
• Fliptronics and WPC-95: weak flipper
• Flipper stuck up but drops when the power goes off
• Upper flipper switch reported bad on a game with no upper flipper

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Two, Clay Harrell (pinrepair.com)