I recently picked up a Bally Power Play machine. After doing some fixes on the rectifier board and reseating some chips on the MPU board, I get the full 7 flash boot sequence, and a neat little chime song.
When I hit the start button I get another song which would indicate the game should start (I think the free play fix was already made before) but the game doesn't start.
If the displays would light up I could try to troubleshoot that, but I guess this should be at the top of my list. I checked the TP3's on each display board and they all get the correct +5V. I don't see them light up at any moment.
Where should I look next?