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Problem solved. The pcb was ok, the -5V on pin 5 in my jamma cab wasn't working. The problem was hard to find because only some games make use of the -5v. Thats why most jamma games and MVS worked fine.

Thanks DogP. Now I know where to start. I know what you mean with touching the pins on the solder side. Sometimes the images gets blured when you thouch some pins with your hand. I have a lot of boards with the Z80 processor so it can be tested. Thanks, TTT242

Hi everybody, I have a lot of boards that are to be repaired when I have some spare time. I have done some simple repairs on a few boards but when it gets a little bit more difficult... I have a Empire City pcb. It plays very good...just no sound at all. It's a game that I used to play a lot in...