If anyone has had experience with this game, I'm looking for some direction. Game powers on, basically all lights on the playfield and back box. The display shows a number and then they go blank.
Watching MPU LEDs, both light up and then go off. There is not the expected flash twice occurring. Am getting proper power to the board, measuring the 5VDC on it. From what I can determine, the CPU is trying to boot but does not. On occasion, I'll get some in game sound/sounds when powering up. Usually just a quick blip of sound, but not always the case. (getting a little further on boot?)
No change in LEDs or game if I disconnect the driver board. What I am starting with, it has the Scanbe IC sockets on the board, so I'm in midst of replacing those sockets currently. Quite familiar with Galaga, where this is a must do approach. If I'm lucky, this may just fix the issue. Seems continuity with the 40 pin connector between the two boards is just fine, I hear these can cause problems, but I don't think that is causing it to not boot.
Any other suggestions? Problem is, the machine is at my brother-in-law's, an hour drive away, and I don't have a test bench set up. So pretty much after replacing the sockets, I'll drive up and plug it in to see if it fixes the issue.