I'm casting my mind back as to stupid things I've done that could have caused the GI to stop working. The biggest culprit... Accidentally touching an alan key between a flipper switch and the metal housing of the score board under the maze. Sparked and I assume blew something. I've checked fuses but all seems fine.Check the pins for dry joints
I fear more so something has blown/fried. I accidentally touched an alan key between a flipper switch and the under playfield scoreboard metal housing. Sparked and GI went on vacation idiotyou won’t get a continuity beep across that,try measuring its resistance instead.
your problem is probably a loose connection or bad header pin. .