Here's what I posted in the neo-geo.com forums:
I waited until now to post about my initial experience with the PCE Super SD System 3, because I wanted to have something factual to present, to discourage people from reporting problems that are likely not the result of the SSS3 itself.
When I first went to try out my SSS3 I was surprised to find that I don't have or have misplaced official power supplies for my white PC Engine, SuperGrafx and TurboGrafx-16. So I used one of those modern cheap Sega Genesis/SMS and NES 2-in-1 power supplies with my white PC Engine and SSS3. I also could only find csync Genesis/Mega Drive 2 scart cables with audio left/right breakout (by retrogamingcables).
I wound up with a worse version of the kind of lines and static that seemed to be the issue with the old board. Behind the lines was a color correct nice RGB image though. My PC Engine has an internal RGB mod and using that output produced a perfect picture. I didn't post about it here or anywhere, because I wasn't using a stock power supply and the audio breakout on the cable might also be a contributing factor.
Today I finally had time to find an official SMS power supply and using it with the same setup, all of the visual noise/static and strong lines are already gone. There is only faint diagonal jailbars, the kind you typically find with stock RGB for 240p consoles which actually output RGB without mods.
So I'm still not using the correct power supply and not the ideal scart cable, but the picture quality is already as good as or better than typical console stock RGB quality and much better than PC Engine RGB mods by people like doujindance.
I'm sure that there are still going to be people posting complaints online, saying that the RGB issue hasn't been fixed, neglecting to mention that they're using random power supplies or RGB cables. When I finish putting together an overview video of the SSS3, I'm going to include an uncut segment showing what happens when using a substitute power supply and then switch to an official one.
Everything else about it works great. I recommend unchecking "Boot To Last Game" until the In-Game Trigger is fixed (if it isn't already). I'm not making separate folders for games sorted by letter or favorites or anything. Navigation is so fast that it's not necessary.
FX Unit Yuki: The Henshin Engine works fine, but for some reason the redbook audio even at the lowest volumes, has some kind of reverb distortion, as though the volume is cranked all the way. Maybe ripping the pressed disc will produce something different? All ripped CD games I've tried so far, even mp3-to-wav conversions, sound normal.
This product is a dream come true and I can't wait till I've finish converting the rest of my mp3 isos to wav and loading the complete set onto the 256GB card I bought for it.
Thanks a lot Terraonion.