PS1 RGB SCART cable - some help please?

Okay. So I've recently bought an obscure video cable for the PS1 (SCPH-1160). I got it for the main fact that it had all 12 pins,so I was able to use it with SCART.

And so,I've started building the cable using this diagram:




Now here is the problem - using a SCPH-5552 console (which I know uses a CXA1645 video encoder),I am getting the following results:

-TV TELETEXT OFF - NTSC games play in black and white (COMPOSITE)
-TV TELETEXT ON - Teletext becomes transparent,everything becomes much clearer and in color - this tells me it's in RGB


Any help? I was able to get it once to show RGB without teletext on but I can't do that on.

I can post pics if needed. Just let me know.

 

Some of RGB cables don't have 180 Ohm resistor - check it.

 

Will try and see. I did the mistake of using the 3v6 diode on 5v. *facepalming myself for how dumbo I am*

 

Okay,I've added a 220 Ohm resistor instead of 180 ( I didn't have any laying around so I took one from a fried PSU) and now this happens:

RGB works without teletext on - tried with SCPH-5552 model PS1 and NTSC copy of Abe's Exoddus. Another problem arises though: changing channels while the PS1 is on results in the RGB image of the PS1 scrolling slowly,while the audio of the channel I tune on is intact. This stops as soon as I turn off the PS1.

 

It sounds like the TV is losing sync. Use Luma for sync instead of composite video. If you want to mod the console, cut the Composite video line on the multi-out and then send true C-Sync to the composite pin. The quality will be much better than composite video and may fix the problem. It could also be just the TV. Are you sure it fully supports 60Hz RGBS?

 

I can't cut Composite video - it's used for the C-Sync pin of the Playstation side. And yes,I am very sure it fully supports any kind of RGBS,be it 50Hz or 60Hz. It's a Magnum TV 5520 VT Stereo television made in Germany. It supports RGB,PAL and PAL60. Doesn't support pure NTSC though (displays in black and white) so that's why I opt for PAL60 on Composite,or RGB if available.

 

The PS1 mod I mentioned removes composite video from the multi-out and replaces it with C-Sync, sending that signal down the same wire normally used for composite video. C-Sync is the purest sync signal used in RGBS. The TV and cable will work fine and give a cleaner image. After all, it's what RGBS was designed to use for sync. Using Composite video as sync can cause artifacts like a checkerboard pattern and ghosting. C-Sync is inside Composite video but it's compressed and messed up by the rest of the video signals bundled with it.

I'm not sure what the problem is but if it only happens in NTSC games, see if C-Sync fixes it.

 

You mean soldering the wire in the picture?


Also,the problem is regardless of what video mode it is in. I mean it outputs RGB normally but changing to any channel (1,2,3 etc.) will result in the same RGB image scrolling through. It disappears if I turn off the console.

 

Yep, just like that picture. You will have to cut the Composite Video trace leading to the Multi-Out. That picture is missing the required components though so wire it like this: C-Sync leg > 75 ohm resistor > 220uf capacitor > Composite Video Multi-Out pin. Without the resistor and capacitor, it won't work.

That scrolling image is weird. Does it do this on any other TV or just this one?

 

It's the only one to do that. Also,it's the only one in my house to have a SCART socket. The other two have the usual composite plugs and the one in my kitchen also has RGB (YPbPr) plugs.

 

By any chance is it a Zenith TV? The PS1 had sync issues with those and required a mod to fix it. Sony did the mod back when the PS1 was commercially relevant but they don't do it anymore. If you can, find a schematic for it and try it out, it might fix it.

 

No. I said above it's a Magnum TV 5520 VT Stereo TV. According to what scarce info I could find about it,it's built by Beko.

There's no sync issue in AV mode. It works fine. It's just that the image of the RGB output shows up over the normal cable (RF) channels.

I'll do a video right now and pack it up in a .rar so you can see what I am talking about.

Also,any PS2 hooked up on the cable has a red tint over RGB,and Y Pb Pr gives a color-embossed like picture.

 

Ah I see, must've missed the brand name earlier.

That's an odd issue. Usually a red tint means an improperly shielded cable with cross-talk but since it doesn't do that on the PS1, we can rule out cross-talk. The video will definitely help out.

 

Okay. Here are the videos.

Download them fast

http://speedy.sh/QSa9p/PS1-PS2-RGB-cable-quirks.rar

 

How do you use that site? Can you post it to YouTube? You can set it so only people with the link can see it if you need to.

 

I could post them to Youtube but it takes very long since the files are big and processing takes quite a lot of time.

I chose to upload them to a RAR file because it's easier. I do have a small (5MB) version of the RAR file but the quality is mediocre.

I will try to upload them to youtube right now though.

UPDATE:





Don't mind the "AV 1 VCR" thing - I just set it to show the VCR text,but it actually isn't only for VCRs. It's just an in-menu editable text.

 

That's really odd. I've never seen an issue like this before. Have you tried another RGB SCART cable?

 

I can' try another RGB cable. That is the only RGB SCART cable I have. The only difference between the diagram I used is that mine omits the three 220uF caps,which are just there to smooth the output. Everything else though,is done as shown in the diagram.

 

Try using the caps. The official cable has them wired up.

 

Tried that - didn't make any difference.