I have a megadrive/32x and snes that work as i get image and sound using a scart but when i try the n64 or ps1 i get only audio using composite cable. I also trieds the snes scart cable but again only got sound.
I also have a special cable for the n64 that uses s-video and when i run this through a bandridge scart selector https://www.amazon.co.uk/Bandridge-Performance-Automatic-Selector-Switching/dp/B0015YYN2Q/ref=sr_1_7?ie=UTF8&qid=1506261736&sr=8-7&keywords=scart+selector
I get sound and a very dull barely visible poor image.
Both devices are unmodded and PAL and i also have a normal n64 composite cable that produces sound and no image.
The sound comes from the ossc and it does not say lost sync and the led stays green, also tried devices with and without the selector using a composite to scart adapter.
I read a post that was similar but for another device that seemed to suggest lack or RGB support through the converter and scart selector?