graphical error

Hey y'all, first time poster and new retro candy cab hobbyist here. I recently acquired a used Net City cab and some arcade boards, purchased separately. I've had pretty good luck with my CPS2 Super Turbo board and my MVS but my coveted Darksoft 3rd Strike board has some graphical and sound...

When I got it, it was suicided. No sign of corrosion or leaks whatsoever, very clean board. Installed an Infinikey and it came back to life, but I'm seeing some weird rows of "dots" (pixels) almost in a grid pattern across the screen during startup, the warning screens, and the intro. However...