I have an NBA Jam board and sound card. I don't have any cables with it. Will the main board power up without the sound board? Does anyone know where I can get a cable set for it?
You can use the main board without the sound board.
Check therealbob in the past he had the three cables you're looking for. If you're going to order the other two cables you might as well get one for the volume as well.
It's not a power supply issue. I put it in a JAMMA cabinet that I know works with other boards. I just replaced the power supply and have verified all the voltages under load. However, there may be voltage problems on the board itself. I haven't done anything with it, but plug it in to see if it works. This is one of a bunch of boards that I got in a lot.