I have two different PCBs that are exhibiting the same problem. At first I thought it might even be something wrong with the CPS-2 A board, but Zero Team (a Seibu Kaihatsu game) does the same thing.
Darkstalkers runs at 59.63Hz which I thought might be the issue, but Zero Team runs at the standard 60 Hz and has the same issue. While I haven't found anything that really states it, I'm guessing the horizontal hold is what adjusts the frequency, right?
Mr Driller 2, Soul Edge, CombatTribes, and Simpsons Bowling all work fine.
NBA Jam comes up, but it's really dark on screen. This one I'm currently chocking up as probably having something wrong with the PCB (although if anybody has any ideas I'd love to hear them).
I'm hoping to pick up a JAMMA cabinet with a working monitor at one of the upcoming auctions. That would definitely make it easier to troubleshoot if I knew they worked in a different cabinet/monitor.