Museum of the Game® & International Arcade Museum® Forums
I have a black and white 3 board stack space invaders game.
I have been able to rule out the PSU and monitor and driver board using external power supplies and monitor.
It worked once for a short bit after removing the monitor from the cabinet and putting it back in for inspection but only for a day.
I have checked on the board stack and I'm getting all my voltages as expected across the 3 boards.
The game is playable even with the messed-up display. the bases are still there you just cant see them and as the invaders make their way down the screen more show up and you can shoot them even off screen including the ufo.
I am comfortable with a soldering iron and scope.
I was hoping someone could give me an idea of what chips to look at and test.
I do have a schematic that is very close to my machine it has some extra chips but seems everything else lines up
Looking at the above PDF I feel like my issue is in the bottom right page 8 looking at those chips and working backwards.
I have been able to rule out the PSU and monitor and driver board using external power supplies and monitor.
It worked once for a short bit after removing the monitor from the cabinet and putting it back in for inspection but only for a day.
I have checked on the board stack and I'm getting all my voltages as expected across the 3 boards.
The game is playable even with the messed-up display. the bases are still there you just cant see them and as the invaders make their way down the screen more show up and you can shoot them even off screen including the ufo.
I am comfortable with a soldering iron and scope.
I was hoping someone could give me an idea of what chips to look at and test.
I do have a schematic that is very close to my machine it has some extra chips but seems everything else lines up
Looking at the above PDF I feel like my issue is in the bottom right page 8 looking at those chips and working backwards.