Super Famicom JR - black and white output

[spaghetticode]

Hello, I made the Super Famicom RGB mod explained here, everything is set properly but the screen is B&W only. I have other regular Super Famicom consoles and they work fine with this cable and monitor (I'm using OSSC).

I think it's unlikely, but I'm wondering if this may be caused by the SCART cable that doesn't have csync?

I tried to debug the issue, and it seems all wires are connected properly and work fine singularly. For example, if I leave only the R wire attached, the picture becomes red, same for the other 2 colors. Does anybody know the reason for this?

[spaghetticode]

Also, just wanted to add that I had checked wires continuity, plus there's no short with them.
I'd like to hear from people that are using the SNES mini or SFC Jr with RGB mod, what mod they're using and SCART cable specs

[Sumez]

I can see you getting a b&w signal from the S-video output, but there should be absolutely no way to actually display that via an RGB channel, unless both the Red, Blue, and Green connections are all getting the exact same signal, since there is no dedicated "luminance" signal in the RGB standard. But I'm not sure how you'd get that if there's no short between the three.

My best bet is that you're not actually looking at an RGB display mode, but OSSC isn't able to handle anything else via scart, is it?

I'm curious what you mean by the cable not having csync. There's no way to display a stable picture at all without a sync signal, you'd just get a complete garbled mess. Do you mean there's no composite video (which would be dedicated by the source, not the cable)? Or are you expecting sync-on-green?

[Kez]

OSSC can handle YPbPr via SCART.. I guess if somehow the luma (or composite?) signal was getting to the green pin, and the OSSC was in YPbPr mode..? Seems like a stretch though.. and that wouldn't make the all red/green/blue pictures described here. Somehow the R, G and B pins must all be getting the exact same signal as you say Sumez. Perhaps if you can run the 240p test suite and look at the colour bars we might get more of an idea what is happening.

Pictures of the mod may also help shed some light!

[spaghetticode]

Thanks for your comments, I eventually was able to fix it. I had accidentally shorted these pins by wrapping the resistors together, instead of connecting them as per the picture. It now works fine!

Regarding what is called the csync wire in the guide, it gets connected to pin 3 (which not connected in my SCART cable). I found this pinout which correctly says pin 3 is for csync, still I get a good picture without it being connected.

So, unless somebody can explain me the reason for adding pin 3 as wellI think I'll leave it disconnected, given it seems to be working fine without it.