Most of the playfield GI stays dark after a burnt J115 connector and its header pins were replaced. The GI fuses test good.

GI string still dead after replacing J115: broken through-hole, add a jumper

Cause: Heat damage had broken the plated through-hole connection between the J115 header pins and the GI triac circuit, so two pins had no continuity to their triac legs. The triacs themselves almost never fail.

Checks

• With the board out, check continuity from each J115 pin to the matching triac leg and fuse.
• Check the GI fuse clips for loose, heat-damaged grip.
• To test a triac, briefly bridge its middle and top legs with the game on: if that string lights, the triac (or its drive) is at fault; if not, the fault is in the wiring or board path.

Fix

• Solder jumper wires on the back of the board from each dead header pin to the triac leg it should reach.
• Replace all the GI connectors and header pins at the same time, since the others are usually heat-damaged too.

The GI circuit carries 6.3 V AC at high current; burnt connectors are a fire risk, so replace them rather than reseating them.

Systems

• WPC Fliptronics

Games

• The Addams Family

Related tips

• GI string dead after connector replacement: broken traces
• Continuity checks after replacing GI header pins
• One GI string is out
• J115 GI input pin map (WPC-89/WPC-S driver board)
• GI fuse keeps blowing: isolate driver board or wiring
• Won't start after a power surge, 5 V reads very low: failed C4 on the power driver board
• GI will not dim or will not turn off
• Lamp matrix fuse F114 (F106 on WPC-95) keeps blowing

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