A general illumination string is out and its power driver connector is browned or burnt.

GI string dead with a scorched connector

Cause: Heat damage in the GI connector on the power driver board.

Fix

• Repair the connector (new header and housing/pins) or bypass it.

Switch the game off before pulling fuses or touching the transformer area.

Systems

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

Related tips

• Backbox GI out while flashers work: burnt connectors at J120 and J121
• Repair a burnt GI connector on the driver board
• Resets from worn power connectors between transformer, driver and CPU boards
• GI connectors on the driver board
• GI out because the GI connector burned
• Check the AC power input connectors too
• Lamp matrix connectors on the driver board
• Burned power driver board traces at the header feeding AC to the Fliptronic board

Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer