Did you have any luck with this? It seems like you might be the only one in the thread other than myself trying to get results with the Worthington mod and the OSSC. I'm also curious what SCART cable you're using, especially if your 64 is NTSC like mine.
I installed the mod but during my test run attempts I haven't seen any response from the OSSC. Most likely it's the scart cable I'm using, which at this point I'm fairly certain at this point PAL RGB cable for gamecube. Seems maybe I should be using an NTSC scart cable (I previously thought this was an oxymoron) with some kind of cysnc functionality,
like this one. I haven't mucked with any of the csync related pins because I don't yet know if it'll do me any good.
The only other equipment I had available to mess with was to try plugging my gamecube into the OSSC with the scart cable. This resulted in sync from the OSSC, but in the form of a black screen. I imagine that's not too surprising given that it must be a PAL cable. (Also I've since seen it suggested that a cable mismatch the other way around can damage a tv! so that was probably a dumb idea, though my OSSC seems unharmed.)
Unfortunately no luck so far. We get image, but it's still got those awful wavy lines like in the photo.
The guy who is doing the mod install for me is extremely skilled and he's tried everything he can think of and he even contacted Tim Worthington himself who offered a bit of advice but had never seen this specific issue before. We haven't been able to find any photos or screenshots online of anyone with the same issue.
So far we've tried:
-2 different OSSCs
-2 different NTSC SCART cables one of which was high end
-2 different N64s
-an isolated clean 3.3v power source
-multiple different types of sync signal
-replacing the ribbon cable with magnet wire
-replacing Tim Worthington's plastic fine pitch adapter with a PCB adapter
So I finally gave up and ordered a different RGB mod based on Borti's design last night.
If you're getting OSSC recognizing a signal but no image, I'd be very careful. I think maybe what happened to my Tim Worthington mod was we might have had a solder bridge between several of the legs of the IC you solder the mod to and that might have damaged the mod (I had two other people attempt to install the mod on a third N64 before someone told me about the guy who is working on it now who has waaay more experience with console mods), but yeah I had the same thing, OSSC recognized a signal, but no image.
With regards to SCART cables, I'm still a little iffy on some of the details, but from what I understand:
Yes there is a difference between PAL and NTSC SNES/N64 SCART cables. If you have the wrong region they will not work properly. That said, if you're comfortable enough soldering the RGB mod, you should be able to relatively easily rewire the SCART cable to match your region's pinout. There are a number of websites with all the pinout information.
Different types of sync can have better results, but the difference is usually subtle, and should work without you having to modify anything.
Also, composite sync/c-sync is completely different than sync-on-composite, which is such a needlessly confusing and annoying choice of terminology.
Hope maybe some of that helps, I know how frustrating it can be; I've been wanting this mod installed for months now, and having seen how amazing the deblur looks even with the ugly wavy lines on my current broken Tim Worthington mod makes the wait even more difficult. I really, really hope the Borti mod works when it gets here in a few weeks, heh.