Had the day off so i've been messing with a few of my project machines.About a month back i picked up a very nice condition magic sword game.It was never in an arcade and instead was owned back in the day by a college student who had it in his dorm room for him and his friends.Well he's older now and has kids of his own so its now in my game room.He stored it in his shed and i was expecting the worst but to my surprise its clean as a whistle inside and looks like it never had dust or a mouse in it.He told me it worked well when he put it away but 15 years later he tryed it and all the lights come on but has a blank white screen.
I figured it was dirty connections or bad power supply but i've cleaned everything and tested the power supply and have power to the board but nothing further.i tried the board in another jamma cab and same thing.tried another board in the magic sword cab and its fine.So i'm pretty sure its the board.I've reseated and cleaned all the ram chips,checked for any visable burns or damage and can't find anything anywhere.I beleive him when he said it worked when stored so i'm wondering what else might have gotten dirty just sitting there.I know that game has a sound problem with the c board i think,but i get nothing out of it at all.
So my question is,where do i go from here?What can i test or check on the board to find the problem or narrow it down?It is in such nice shape and looks so clean i'd like to keep it a magic sword,and a replacement pcb isn't in the budget.There's gotta be somewhere i'm not looking or missing,just haven't run into a completely dead board before and don't know where to start.