Hello everyone, i recently purchased an official snes european scart cable. I do not own a TV with scart input but my sony PVM 2950 has RGB input. So i made myself an adapter with some bnc and rca jacks and a female scart connector. The adaptor connects all of the following: CSync, Red, Green, Blue, Audio left, Audio right, and a universal ground. When i plugged it into my tv, it did not work. I got red and blue curved lines scrolling rapidly vertically on the screen. I think this may be the image not syncing. I checked my adapter with a multimeter and everything checks out so i think it's the cable... can somebody help me fix this so i can enjoy the glorious RGB?
An official PAL SNES SCART cable won't work on a NTSC SNES or Super Famicom without modification.
An official or third party GameCube SCART cable will work perfectly on NTSC SNES machines though.
Look at the differences here (http://members.optusnet.com.au/eviltim/gamescart/gamescart.htm#snes), basically to NTSC-ize your cable remove the little board with the resistors inside the SCART plug, install the usual capacitors on the RGB lines and join the rest of the relevant signals (sync, audio, ground).
Quote from: 133MHz on June 09, 2012, 05:47:23 pm
An official PAL SNES SCART cable won't work on a NTSC SNES or Super Famicom without modification.
An official or third party GameCube SCART cable will work perfectly on NTSC SNES machines though.
Look at the differences here (http://members.optusnet.com.au/eviltim/gamescart/gamescart.htm#snes), basically to NTSC-ize your cable remove the little board with the resistors inside the SCART plug, install the usual capacitors on the RGB lines and join the rest of the relevant signals (sync, audio, ground).
I have a universal multi Xbox/PS2/GC rgb scart cable, and I can also confirm that the gamecube one works with my US Snes on NTSC televisions. :)
Of course, I'm just using a scart rgb to component video transcoder.
Thanks!
Update: i fixed the cable to be like the picture. Excluding the plus 5V because it's not used. The image looks perfect, but it is scrolling or wavy and messed, but it also only appears when there is no sync. As soon as i plug in the composite signal to the sync, the sound and the image go away. But if i reset the system, a barely distorted image appears for a few milliseconds but no sound plays. Then no image. Help? The c sync works perfectly as a video display in a regular composite image and sound works.
Quote from: famiac on June 10, 2012, 09:45:06 pm
Update: i fixed the cable to be like the picture. Excluding the plus 5V because it's not used. The image looks perfect, but it is scrolling or wavy and messed, but it also only appears when there is no sync. As soon as i plug in the composite signal to the sync, the sound and the image go away. But if i reset the system, a barely distorted image appears for a few milliseconds but no sound plays. Then no image. Help? The c sync works perfectly as a video display in a regular composite image and sound works.
This is getting a little too much out of my territory, but maybe your display simply can't accept a PAL Scart signal or whatnot. Once again, my only experience is with an NTSC TV with a true Euro scart input (Bang & Olufsen), and on other TVs with a transcoder.
I'm probably not helping much, but possibly a Japanese RGB cable (or rewired for Japanese RGB) would suit your situation?
Im using an ntsc snes and the cable has no reason not to work. It corresponds exactly to the diagram minus the extra 5 V wires
They all share the same ground by the way. (in my setup)
Quote from: Phosphora on June 10, 2012, 11:03:00 pm
This is getting a little too much out of my territory, but maybe your display simply can't accept a PAL Scart signal or whatnot.
PAL/NTSC issues won't matter much through RGB, and even then the output frequency is determined by the system, not the cable.
Bump. Please help. Im Leaving town soon and i wanna see if i can fix this.
Are you sure you're connecting C-sync and not composite video? I got a wobbly picture from my RGB-modded NTSC Nintendo 64-system whenever I tried to play PAL-games (using an import-adapter, of course) before I replaced the composite video signal with C-sync as per this guide:
http://www.mmmonkey.co.uk/console/nintendo/rgbntsc.htm#fourx (http://www.mmmonkey.co.uk/console/nintendo/rgbntsc.htm#fourx)
Quote from: untinip on June 14, 2012, 03:41:39 am
Are you sure you're connecting C-sync and not composite video? I got a wobbly picture from my RGB-modded NTSC Nintendo 64-system whenever I tried to play PAL-games (using an import-adapter, of course) before I replaced the composite video signal with C-sync as per this guide:
http://www.mmmonkey.co.uk/console/nintendo/rgbntsc.htm#fourx (http://www.mmmonkey.co.uk/console/nintendo/rgbntsc.htm#fourx)
That might do it. Most PVMs are fine with composite video as a sync signal but I know some throw a hissy fit if it's not a proper sync signal.
Ah ok. Let me try that.
C-sync is pin 3. So it should be a simple mod. When rgb modding a famicom, is it possible to get a C-sync instead of composite video? Or, there's a sync stripper chip, but i forgot what the name was...
Quote from: famiac on June 14, 2012, 12:38:45 pm
C-sync is pin 3. So it should be a simple mod. When rgb modding a famicom, is it possible to get a C-sync instead of composite video? Or, there's a sync stripper chip, but i forgot what the name was...
The 2C03 outputs sync where the composite video would normally be on a 2C02 (pin 21). The chip you're thinking of is the LM1881.
Thanks a bunch! I got it working! Yes. But i think it looks worse... XD
For some reason the colors look washed out. They bleed into each other. It's so weird, i thought rgb was supposed to do the opposite... Any idea why that's happening?
Edit: i turned brightness all the way down and the picture is waaaaay better but there's still that bleed effect but it's faint. Any idea what that is?
Some pictures of your display / wiring / setup could be of help. ;)
For the record, my Sony PVM-1351 displays the RGB + CVBS as sync of the SNES perfectly, RGB lines decoupled by 100µF electrolytic caps and everything else wired straight through (modified PAL SNES SCART cable + SCART to BNC box).
Im leaving town tomorrow morning. Ill take pictures in a week when i get back
You're using a PAL SCART-cable with an NTSC SNES, right? Then, as 133MHz said, you need to add a 100µF electrolytic capacitor to each R, G and B-line. See this page:
http://gamesx.com/wiki/doku.php?id=av:nintendomultiav (http://gamesx.com/wiki/doku.php?id=av:nintendomultiav)
The capacitors remove the DC offset from the signal. That's probably why you get such a bright picture.
I used 220 microfarad caps because that's what this website shows: http://members.optushome.com.au/eviltim/gamescart/gamescart.htm
Yeah, I meant 220µF. I was thinking of my Nintendo 64 RGB-booster again... Please post some pictures when you get back.
I definitely will. Thanks to all for all the help!
Could it be possible that the picture is getting interference in my homemade adapter? It's not shielded at all, the wires are open, the wires are super thin, and everything is exposed. (lazy as hell i know, but i just wanted to test before spending 40$ on a proper adapter) The wires are really short though. (2-4 inches each)
Yes, that's why I asked for pictures of your wiring and setup, even though 15 kHz video is usually quite forgiving of bad cabling.
Ok. Ill shed 40$ on this: http://www.retrogamingcables.co.uk/sony-pvm-scart-convertor-bnc