Some backbox or playfield GI lamps are out and the J115 connector on the power driver board is burnt through, with a loose wire.

Burnt J115 connector on the power driver board: GI current, re-crimp

Cause: J115 carries the general illumination current from the transformer. Over the years the heat at the old connector pins cooks the housing and header.

Checks

• Inspect J115 and the matching header on the board for browning or burnt pins.
• Check the board header solder joints, which often crack or burn too.

Fix

• Have the burnt header replaced on the board.
• Replace the connector with new crimped .156 Molex pins and housing, or fit a new transformer-to-GI harness.
• Converting GI to LEDs lowers the current through the connector.

Unplug the game before working on transformer wiring.

Systems

• WPC Alpha-Numeric

Games

• The Machine: Bride of Pinbot

Related tips

• Burnt spade connectors in the power box
• Repair a burnt GI connector on the driver board
• Lamp matrix connectors on the driver board
• GI string dead with a scorched connector
• GI connectors on the driver board
• Check the AC power input connectors too
• Resets from worn power connectors between transformer, driver and CPU boards
• J115 wire colors on games before Twilight Zone

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