Police Academy?

>>243209
Looks like the board's fine, but the monitor has faulty sync.

Bad news: it's a lightgun game, so you need to have a CRT.
Good news: it could be as simple as a dodgy wire.

You can test the monitor with any home console from the '80s-'00s and a SCART lead; I recommend the original Xbox, as the AV connector and video chip is the same for all regions, so even if you're in the USA, you can softmod it and fit a SCART cable.

If you're in Europe, you can test the board with any old CRT TV and a JAMMA/SCART adapter. SCART TVs will accept arcade RGB signals just fine.
If you're in USA, sucks to be you.

If you know the board's outputting a good signal, and the wire's good, and the monitor's still not syncing, it's time to google "CRT repair FAQ", and see what it says. You can also take the monitor to any TV shop; they'll be able to work on it because it's just a big TV. If you bring them whatever you were testing it with, that'll help.

I'd recommend replacing every single electrolytic cap on the motherboard. It won't take much longer or cost much more than trying to identify the bad caps and just changing them.

>>243246
Should I replace the capacitors on the game board or on the TV board?

>>243262
Hi, that may not work, but caps are cheap and its worth a try.

>>243262
TV board. You want to replace, at a bare minimum, the ones in the horizontal oscillator (which you can find by tracing from the sync pin).

But make sure you're feeding in a valid sync signal first. There's no point dismantling the monitor when it's just a loose or broken JAMMA wire.

>>243281
Dude, thanks so much