Colour red too bright on 1chip snes with RGB cable

[Visker]

I recently bought a RGB scart cable with Csync for my SNES.
Some reason the colour red when it goes into deeper red goes orange, less bright red shows as normal red.
One way to reproduce the issue is to run Super Street Fighter 2, when a fight starts ends or starts the level fades in and out.
When a fighter with a red shirt is on he will show red when fading in but when the picture is full bright the colour goes to a sort of orange.
Below are 2 pictures taken from the tv running the 240p test tool. The pictures look identital in person.
The SNES is a Super famicom 1Chip-01. Ive tested with composite and S-video cable which showed the red just fine.
Ive googled a bit after the issue and found out 1Chip SNES almost always gives out a too bright picture which can be fixed with 3 x 750 ohm resistors on the RGB channels, though the picture when comparing to S video/composite doesnt seem off brightness wise overall.
Blue and green show just fine in testing compared to other cables. Ive also noticed there are caps on the RGB wires within the cable.

http://imgur.com/a/ZGGc9

Any help would be appreciated

[Guspaz]

Does this issue occur with other systems? Maybe it's an issue with the monitor.

[Visker]

I also have a PAL SNES with SCART + luma which works just fine.
And oddly the Luma scart also works perfectly on the super famicom.
Even though the PAL Luma cable has resistors in it and the NTSC cable has caps in it.
The NTC Csync cable was tested on the PAL SNES but doesnt work as expected probably cause the PAL SNES can only output Luma sync at best and not Csync.

[FinalBaton]

SNES' RGB signal(only. does not apply to S-video and composite) is a lot brighter than most consoles' (not sure if this plagues ALL SNES mobo revisions though. but it must affect at least a couple of them because I frequently see this problem mentionned online). Maybe that's what it is.

I mean look at your 2nd pic : the color ramps' gain are WAY overblown on all colors. not just the red. The end of the ramps should look like what's between 7 and 8. They hit that peak WAY too early.



Personally I adjust my SNES' signal with an Extron RGB interface (dial the 'gain' down)

Maybe there's a way to attenuate the signal by modding your SCART cable. But I couldn't tell you how to pull it off since I'm not knowledgeable when it comes to modding



I would start with that step, and then if the reds are still off I would take more actions