Psone s-video and composite inputs

segasonicfan · Post by **segasonicfan** » Wed Oct 13, 2004 8:48 am

Hey, I just had a few questions concerning the psone screen. I read on another forum (i think the bit-tech forums) that the psone screen can be hooked up through s-video....yet I don't know where the crominance line would be. anyone know how to do this?

Also, my psone screens composite video looks unusually crappy. it seems to have a lot of vertical lines through it. theyre stationary, so it's not a grounding problem. its not a bad connection either, ive checked it repeatedly. is this common or is it my screen?

also, does anyone have the pinout to the a/v and headphone jacks? im not sure im getting the pins right since I cant figure out ho toget composite with stereo sound using the jack. someone has to know how to do this (that hasnt dismantled their screen...)

any help is much appreciated!

-Segasonicfan

MR.MOD · Post by **MR.MOD** » Wed Oct 13, 2004 1:57 pm

I don't think that the screen has svideo well not at least on the connectors. You might be able to put it in one of the lcd controller chips but I haven't looked at that yet.

To get composite with stereo you need one of these cables http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 21385&rd=1

notice how many connectors it has on the 3mm jack.

Or you could hook it up directly like this http://benheck.com/ipw-web/bulletin/bb/ ... 9&start=15

I'm not sure about the video quality though. Might be your connectors, video source or the screen. My screens quality is pretty good though.

Post by **gannon** » Wed Oct 13, 2004 2:22 pm

From my understanding, the psone lcd can only use composite and rgb. It gets composite from the 3mm jack, and rgb from the psone a/v jack.

segasonicfan · Post by **segasonicfan** » Wed Oct 13, 2004 3:58 pm

I know where the jacks are and what theyre for...I was asking for the pinout under the jacks. eh, dont worry about it, I'll just use some RCA stereo jacks.

I have that cable pictured, it just isn't working, I think I have the wiring wrong or something. When I use RCA jacks it's fine though. *shrug*

I guess my PSone just got messed up from my tinkering and it has a poorer composite output. The RGB is still perfect though, so I guess it doesn't really matter.

As for the S-video, here's the site I found:

http://forums.bit-tech.net/showthread.p ... 951&page=5

Here's a quote:

"Alright, so I'd need a Sony-brand car adapter for sure? Cool. About the S-Video. Here's a pic of a cable: http://edomekuvat.soneraplaza.fi/la...2001/svideo.jpg

Is there no port on the lcd that the s-video cord will plug into? Ah, I guess there is: "All you need for S-Video is the right cable. There's a port on the back of the LCD that you plug it into, then plug the other end into the TV-out on your video card. No soldering, no messing around with Powerstrip or having to use a second video card. The picture's not too bad either." - MegaRouge found one! Maybe there is hope after all! Hopefully he can tell us which cable will work like this."

If you look further down through the article you'll find they actually have the screens hooked up and displayed (and also on another bit-tech forum), so I figure it has to be possible...maybe the chroma line is mixed with the composite signal or something? Luma is already there, so Chroma must be possible...

-Segasonicfan

Post by **gannon** » Wed Oct 13, 2004 4:09 pm

They basically used the 3mm jack. It only accepts composite video, so I suppose they soldered the luma and chroma lines together and just hooked that up to the composite input.

Edit:
ok, I finally checked out the picture of the cable they wanted to use, and all I'm going to say is that that won't work.

Dave · Post by **Dave** » Wed Oct 13, 2004 6:55 pm

segasonicfan I get those lines when I use the 3mm composite jack too. Yeah, that sucks

but after a while you don't really notice them.

JackFrost22 · Post by **JackFrost22** » Thu Oct 14, 2004 4:25 am

I get BIG lines when i use ether with my universal power supply but when I plug it into my nes at the same time I don't geet any lines. My supection is that its the amps. But it couldn't be. Could it?

stereth · Post by **stereth** » Thu Oct 14, 2004 2:51 pm

The PSOne screen does not accept SVideo. You can convert SVideo to composite, but the result is worse than native composite.

For the A/V input, you need a four-conductor plug. Tip is left audio, first sleeve is right audio, second sleeve is composite video, rest is ground. I haven't gotten it to work myself, but I'm sure that's how it's connected.

HK-47 · Post by **HK-47** » Thu Oct 14, 2004 3:08 pm

A bit off heres how it goes:
1 - Left Audio
2 - Video
3 - GND
4 - Right Audio

Hope that helps.

segasonicfan · Post by **segasonicfan** » Thu Oct 14, 2004 8:33 pm

Dave-thanks for your input on the ...erm output

I'm glad to know it's not just my screen, so hopefully I didn't damage it. I;m going to test it again using the official AC adapter, I just realized I hadn't done that yet! I'll go off and test it now...

HK-47- I think you (and everyone else) isn't realizing what I am asking. I am askign for the pinouts to the BOTTOM off the 3mm jacks...on the PCB itself. I'm not sure I have the pinout right...I'm trying to connect the audio left/right outputs (for headphones) and the video/audio inputs to the PCB with the 2 jacks. I cut out that portion of the PCB for use on my portable with the Sony screen. If someone has the pinout that would be very helpful.

As for the S-video---I really don't understand how they think they got S-video on that screen over at bit-tech, but you and I are of the same opinion that it isn't really possible. Hrmm.

As for the A/V in cable...that pinout seems to be a lot different that what my cable is doing. My RCA input is using pin 1 for video and pin 4 for ground...maybe that's the problem--I need a new cable...
Can anyone verify this?

Thanks guys,

-Segasonicfan

segasonicfan · Post by **segasonicfan** » Fri Oct 15, 2004 4:45 am

Hey guys, guess what---

the PsOne screen DOES do S-video!! :O

I just tested the connection myself. It's very odd but it certainly works. Using my DVD player's S-video output I connected a 3mm double sided stereo jack to the ps one screen. I'm not sure which was chroma and which was luma (because I don't know the internals of the DVD player), but they're there. Here's the weird part: one is connected to composite in, and one is connected to ground (???) Sure enough though the DVD was playing on my PS-one screen.

And it was DEFINITELY S-video because it didn't have all the crappy lines that show up when I input composite.

So does anyone believe me? Go try it yourself!

-Segasonicfan

Post by **gannon** » Fri Oct 15, 2004 5:08 am

So no part of the luma and chroma are being bridged by the connector?

segasonicfan · Post by **segasonicfan** » Fri Oct 15, 2004 5:35 am

Nope, not at all. In fact, when I tried that with my Genesis I didn't get a picture. I don't think you can simply connect the two for composite, b/c of the sync info split between them. In any case, they weren't touching and the quality was better and I didn't have the composite lines (just on my screen) so I'm very sure it's s-video

-Segasonicfan

Post by **gannon** » Fri Oct 15, 2004 7:51 am

Actually, you can connect luma and chroma to make composite, I've done it with my video card that only outputs s-video and it works fine.
That is odd though

segasonicfan · Post by **segasonicfan** » Fri Oct 15, 2004 8:20 pm

did a lot more testing with this today...not sure what to make of the results.

the lines are definitely not connected, I even used different RCA stereo cables and one that I cut with the 3 wires separated (and individually insulated) at the ends. I connect to of the wires, one to ground and one to composite in, and I got the video again.

The other weird thing is though, when comparing my DVD video between composite input and s-video, I can't see any noticeable difference. However, I am using the s-video output and I do get a picture...so I'm not sure how that works. The quality is good though, for some reason much better than when I connected my N64 to the composite input.

I hope somebody else can try this and tell me what theyre take is on it. I'll keep on testing with other s-video outputs.

-Segasonicfan