The +62 V supply is wrong or missing on a WPC-S or earlier controller board.

+62 V wrong: burnt trace under R9

Cause: The trace from the small bridge BR1 runs underneath R9 (1.8k ohm 5 W). Heat from R9 can burn and break it, out of sight under the resistor.

Checks

• Check continuity along that trace, lifting R9 if needed.

Fix

• Repair the trace with a jumper and remount R9 slightly above the board.

High voltage section: work with the game unplugged.

Systems

• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)

Related tips

• WPC display and DMD controller board versions
• Dot matrix display supply voltages
• Flickering dots after repairing an older REV 6 DMD controller
• Dot matrix display faults
• What the WPC dot matrix controller does
• Vertical lines and garbage on the DMD mid-game: press the ASIC back into its socket
• One or two display columns stuck on
• Dot matrix display blank or faulty

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