After replacing a GI connector, part of the general illumination works but several strings stay dark and some GI outputs read 0 V, although the fuses and test points are fine.

Several GI strings dead after a connector repair: lifted pads at J115

Cause: The pads for pins 3 and 4 of the GI input header J115 on the power driver board had lifted, so the voltage reached the header but not the GI fuses.

Checks

• Pull each GI fuse and test it out of the holder; check the fuse clips too.
• Measure from the J115 header pins to the GI fuses on the board: voltage at the pin but not at the fuse means a broken pad or trace.
• Inspect J115, J120 and J121 headers and plugs for burning.

Fix

• Repair the lifted pads by running jumper wires from the header pins to the traces (or fit a new header), and repin any cooked GI plugs.

Unplug the game before working on the power driver board.

Systems

• WPC Dot Matrix

Games

• Gilligan's Island

Related tips

• GI string dead after connector replacement: broken traces
• General illumination strings
• One GI string is out
• No GI at all
• Lamp matrix faults with all lamp transistors good
• Test GI outputs on the driver board
• WPC lamp matrix and GI driver parts
• J115 GI input pin map (WPC-89/WPC-S driver board)

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