Any pcb nerds here?

So, long story short: whilst trying to put my Double Dragon board into free play, I flipped the wrong dip switches and the screen inverted. Flipped them back, and nothing changed. My screen is upside down, and turns out the board was already in free play. Hit the micro switch on my coin mech to see if I could actually get a credit; nothing. Jumped out the terminals for 1p credit on the jamma harness and; nothing. Anybody got any ideas?

I believe Jammarcade.net had a similar issue with a Double Dragon PCB. I hope it doesn't involve having to probe and replace TTL chips, like they had to do :(

Here are the schematics for the Double Dragon board, taken from Jammarcade.net: https://www.dropbox.com/s/kti8i6s6lf...ragon.pdf?dl=0