XtraSmiley
Legendary
No, it definitely could be the SG. Many of them are crap and use poor circuitry for video out (or at least not as good as the HAS).
Arcade PCBs are complex and wildly different than one another so it doesn't necessarily mean your PCB is bad.
Arcade PCBs are complex and wildly different than one another so it doesn't necessarily mean your PCB is bad.