I’ve been trying to troubleshoot a problem with my NGG for a couple of weeks and have been entirely unsuccessful.
As far as I can tell, I randomly get activation of the right popper with the associated right white upper flasher and the thumping noise that generally precedes a ball popping out to the right flipper.
In diagnostic mode, the opto did not appear flaky, but nonetheless, I replaced it. I also swapped in a different Opto board and the issue continued. I also swapped in a new CPU board from rotten dog, using my same chips, and it also followed.
In diagnostic mode, I activated every switch and did not get any aberrant behavior for the right popper Opto. I also replaced diode‘s on everything in the switch column and row just to be careful, and I activated every switch and got no suggestion of a short.
Oh, I also shook the cabinet as hard as I could while in switch mode and have not seen any flaky Opto’s.
When playing, I cannot figure out a pattern for why it activates.
I have not rebuilt the connectors, but none of them (both the under play field connector and the back box connectors) look damaged or affected in any way.
Does anybody have any suggestions here. I am getting stumped on this one.