S-Video on PSOne Screen. You can't do it..

Stab · Post by **Stab** » Fri Jan 06, 2006 11:29 pm

Harshboy wrote:

In the first pic where it sais to take the cap off, can you just rip the whole thingy off and solder to the board? O is there something important about it that will break the screen if i take the whol thing off?

I found that after taking the cap off, the image was lacking a lot of color. I put it back on and there was TONS more color, almost too much! You may want to try it with or without, and see what suits your needs better. Having it off completely wont hurt anything though, its the same as having only one side connected, no current gets through.

Harshboy · Post by **Harshboy** » Sat Jan 07, 2006 8:44 am

So in reality, i could just solder wire to one side....and then solder it to the other side?....or just put a blob of solder there, and solder the luma wire onto it?

Stab · Post by **Stab** » Sat Jan 07, 2006 12:38 pm

You COULD, but then you'd have a LOT more color, and everything will look oversaturated.

Harshboy · Post by **Harshboy** » Sat Jan 07, 2006 12:46 pm

O well.....i wont mind

sniper_spike · Post by **sniper_spike** » Sat Jan 14, 2006 10:52 am

segasonicfan wrote:Has anyone had any real success with this mod (i.e. noticeable video quality difference)? I tried tweaking it abit by removing the chroma killer trap on pin 59 and isolating luma better with an additional resistor (like the datasheet recommends). However, I keep getting the same result- images that look the same as composite (I can't notice any difference). I know the chroma and luma lines are seperate though because at input they read different voltages and produce a bad image when swapped...so they ARE going in seperately, I just think the chip is mixing the signals internally

It doesn't say on the datasheet that it has a dedicated S-Video mode, only that it ACCEPTS Y/C inputs....but maybe it's only capable out OUTPUTING Component, RGB, and Composite..... :/

-Segasonicfan

So then what's this all about?

segasonicfan wrote:SUCCESS!! After a couple hours tinkering and looking over the schematic I managed to output full S-Video. And the quality is WAY better than composite! This is good news for Atari makers and those with DVD players with macrovision (like the PS2) =) What I'd really love to do now is get component video working on this but that's gonna be hard....=/

-Segasonicfan

segasonicfan · Post by **segasonicfan** » Sat Jan 14, 2006 5:04 pm

obviously I was mistaken. After another couple hours examining everything I can't notice a difference.

-Segasonicfan

G-force · Post by **G-force** » Sat Jan 14, 2006 6:27 pm

So the S-video looks the same as composite?

That's a bummer, I was looking forward to getting better looking video with my N64.

segasonicfan · Post by **segasonicfan** » Sat Jan 14, 2006 6:41 pm

yes...from what i can tell. I believe the chip is mixing the Y/C inputs internally

-Segasonicfan

Kurt_ · Post by **Kurt_** » Sat Jan 14, 2006 7:32 pm

But that's good news for newbs like me.

It means that to get a good video signal, we don't need to do all that work

daguuy · Post by **daguuy** » Sat Jan 14, 2006 7:39 pm

actually it means you can't get a good signal, even if you do go through all that work

Kurt_ · Post by **Kurt_** » Sat Jan 14, 2006 7:41 pm

There's absolutely NOTHING wrong with RGB

(To be honest I can't tell any difference between normal/s-video from my gamecube)

And I've got 20/20 vision.

sniper_spike · Post by **sniper_spike** » Tue Jan 17, 2006 4:09 pm

For the last couple days I've been looking for some alternatives to this mod. Mainly trying to find a video encoding IC that supported Y\C -> RGB. I first found this-- http://web.archive.org/web/200112062203 ... ircuit.gif
first it's for VGA and not exactly easy.

So frustrated about this almost-victory I kept searching. I stumbled across this little sucker-- http://home.att.net/~billhudson/rybyrgb.pdf
close, but no cigar.
I found some links directing me to a perticualr site, none of them hit bang on what I wanted, but I still explored the site. I found this page-- http://www.epanorama.net/links/videochips.html and started looking through the columns for something that sounded good. I noticed repetative entrys in the "Analogue video encoders" portion (the AD72x series). Rather intrigued by this I decided to check out the site. After just a few clicks of the mouse, I found myself on this lovely page-- http://www.analog.com/en/subCat/0,2879, ... 5F,00.html
and I exclaimed to myself "It's a gold mine!"

Now I was looking for a datasheet for any of the RGB outputting IC's for some example circuits. Finding one quickly, for a split second I thought my journey was finaly over! But alas, the "datasheet" was so crappy--it barely had anything!
http://www.analog.com/UploadedFiles/Pro ... _FINAL.pdf

Oh noes!

I didn't give up, I kept looking through the list and found another IC-- http://www.semiconductors.philips.com/c ... 0A/N1.html , and also after searching through the forums, finding this page-- http://www.epanorama.net/phpBB2/viewtop ... svideo+rgb . Sweet!

I'll be looking into both of them later, but now I've got some other work to do.

Jeepin_CJ7 · Post by **Jeepin_CJ7** » Wed Feb 22, 2006 1:35 pm

Any update sniper?

TIA

Foxx373 · Post by **Foxx373** » Mon Jun 12, 2006 1:28 am

segasonicfan wrote:yes...from what i can tell. I believe the chip is mixing the Y/C inputs internally

-Segasonicfan

Its been a while since i posted, Been kinda busy, and the the noobs... dear god set me free.

Anyways, Ive done some work on my screen. no luck getting it into Compinent mode, I need a logic anylizer which I just have no money for. No matter how elaborate my home made one is, it just doesnt do the job.

As for the S-Video, Im pretty sure it muxes the Y/C channels internally no matter what. I have done everything I could think of to try and isolate them, and nothing worked. I also looked at the flowcharts of the screen/chips and it does seem that the Y/C do hit a muxer internally.

Spike - Word of advice, Analod Devices give out samples of their stock, get a bunch of stuff. I was able to get a CRAPLOAD of AD742 ICs to make RGB to Composite/Svideo converters. I wouldnt reccomend taking a Y/C signal and demuxing it into a VGA. Think of a video signal like a modem connection. You only have so much bandwith going down the line. S-Video splits the signal into 2 seperate streams, allowing more data flow, like having 2 modems. VGA uses 5, Reg, green, blue, H-Sync, and V-Sync. Nothing you do can make a Luma/Chroma signal look any better than it allready is. Its like having a fast 3meg DSL/ connection, but downloading from a server that can only send at 500k... get the point? There is only so much "data" for the S-Video, and if you split it into RGB/VGA, its still only going to have that limted amount of "video data" Read this if this is still all hazy and confusing: http://atarilabs.com/meat/2000/1201_videoprimer.shtml

segasonicfan · Post by **segasonicfan** » Mon Jun 12, 2006 4:02 am

ahhh this post keeps haunting me...lol.

Yeah, I think the only way to unmix the S-Video internally is to feed it the proper logic levels via the I2C bus and the AN Samsung chip which no one has a datasheet for. I don't think this or Component will ever happen on the PSOne screen and have thus given up working on this :(

-Segasonicfan