I'm trying to debug a GI issue on Gilligan's Island. Burnt J120 and J121 IDCs have been replaced, J115 IDC has been replaced, fuses have been checked. None of these have fixed the problem so far.

Only certain GI chains (orange and yellow) work, purple, brown and green do not. Per pinwiki http://www.pinwiki.com/wiki/index.php?title=Williams_WPC#General_Illumination_Problems , I checked the voltages between a specific GI chain and its tracer on J120 and J121 and get 6.5 VAC for orange and yellow, but only 1.5 VAC for brown, green and purple. Pinwiki only says if you have voltages using this check look elsewhere, but doesn't elaborate if the voltage isn't between 6 and 7 VAC.

My thought is next to check the voltages at J115 to see if I'm getting what I'm supposed to there. If so I can surmise the problem is between J115 and J120/J121 (i.e. triacs). I was going to check the triacs but the link in pinwiki to that procedure is dead.

My question is, what should the AC voltages be at J115? Do I check them using TP1?

The article talks about checking J115 pin 11 and the AC power input connector. What about the other J115 pins? I checked fuses F105 to F110 out of their bases with a multimeter and all tested fine.

I haven't gotten there yet - it's very awkward as the backbox door is right in the way to get good access to the triacs. I suppose for a continuity check the board could be out of the game but I was hoping to avoid that.

Thanks to everyone. Turned out to be a horrible attempt by the previous owner to replace the pins on J115. The board was badly burned and the traces had lifted on almost half of the pins. This would explain the hack I found where a connector was soldered in the middle of the board to bypass the GI fuses and J115.

Some lengthy surgery later and all GI are up and running. However, based on the condition of the board and traces at J115 I'm leary how long my repair will hold out.

If by stitch you mean running a wire through the hole then yes.