I'm working on a Stern Magic. About half of the feature lights are not working. For example the High Score light is out. If I connect to ground it lights. No light when connected to the driver board. I connected a jumper from J2 - pin 23, still no light. I did the same for Game Over (J2 - pin 11) - no light. Those two lights are from two different decoders (U2 and U3).
I suspect the problem is in the lamp address or lamp data connectors from the MPU. How can I test these inputs?
All the connector headers and crimp connectors are new but I've found 3 bad connectors already. (in the displays and the switch matrix)
Thanks
Bob