I have a Bally lamp driver board that will not light four different lamps even though their transistors (2N5060) test good out of the game. Upstream, they go to three different IC's. Is it possible that they will fail in test mode and/or gameplay but pass an out of game diode test? If I put a separate ground jumper on the ground tab, they will light.
New! Dark mode!
Browsing Pinside at night? Getting tired of all the white? Switch to dark mode using the button in the top right (or CTRL-B)!