You can probably close this thread now, as I’ve figured out what the issue was: on the Pana Twin, there is a sync dial in addition to the RGB dials for fine-tuning the image. The sync dial on my Pana was at maximum when I got it back from repair originally, which funnily enough worked fine for most of my other boards and on my old TV, so I never really paid it any mind until recently when I needed to get it all hooked up into my capture setup.
So I took a micro-screwdriver and very gently started to dial down the sync dial while the supergun was switched on and connected to the OSSC, and after a certain amount of turning, the picture suddenly appeared, pin-sharp. I’ve done a small amount of fine-tuning, and now the OSSC is picking up all of my boards. I guess the SSV System boards need a lower sync output, otherwise the capture device doesn’t see it at all.
Just gave it another try, but this time I factory-reset all settings on the OSSC before doing anything. Tried Mahjong The Lady Hunter first as I knew that worked, and as expected the OSSC picked it up first time.
Tried an SSV System board straight after, and nothing. Tried going in both directions with H-sync Tolerance as you suggested (with everything else on factory reset), and still nothing. I’m assuming it might have something to do with the game’s native resolution, or something?
It shows “No Sync” on the LCD on the OSSC, but only with SSV-based PCBs. Other PCBs through my capture setup display fine.
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