Messed up my Black Widow

Hey guys, I've only posted here a couple times because I'm such a newb that I am embarrassed sometimes but I thought maybe you could give me some pointers on this.

I had a nice working Black Widow game and then acquired a spare complete PCB and decided to test it in my cabinet.  When I put it in, it had issues I won't go into here but I decided to swap my roms from my working board onto that one to see if it helped.  It did, but I got wonky video that's beyond my skill level so I figured I'd just swap the roms back onto the fully working board and sell the the other board as non working.

However, when I swapped the roms back I got zilch from my original board.  No LED came on and I wasn't getting +5 at the board.  But putting the broken board back in still showed life so I knew it was something wrong with the PCB that was originally working fine.

So....I screwed something up when I removed the roms or when I put them back.  Now I've tested resistance between the +5 and the Ground test points and they are shorted together.  Removing all the rom chips leads to the same result....they are still shorted.

I'm stumped about how to figure out where the short is.  Are there any tips or should I just assume this is once again beyond my skill level and send this thing off for repair now?

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Received on Sun Jul 1 01:15:22 2012