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

[A.J. Franzman]

And it works! I used 3 100PF compacitors that I pulled off of a GBO board.
I got em near the Link cable. There should be 4 capacitors there that say 101 on them. De solder them and hook e'm in series(i cut up a breadboard)
that way you have 400Pf. I am using 3 out of the 4 compacitors and it works fine.

Capacitors in series do not add, they divide. Four of 100pF in series equals 25pF. Three of 100pF in series = 33.3pF. If you want to increase capacitance, wire them in parallel. Then the values add.

[chaostic]

So, can someone post a schematic for this mod?

C----Unsoldered Cap
Y----Soldered Cap
\---Connector where?

CGround----Composite in Ground?
YGround----Composite in Ground?

Also, would connecting a switch to allow composite in to still work affect the circuit? (set up so both C and Y get disconnected at the same time from the board)
Soldered Cap-Left Pole Throw 1
Unsoldered Cap-Center Pole Throw 1
C cable- Right Pole Throw 1

Empty- Left Pole Throw 2
Y cable- Center Pole Throw 2
Cap- Right Pole Throw 2

Or is the switch neccessary (I ask because of the unsoldered cap and don't know if this makes composite unable to work.).
I plan on making a connector board so that I can have a svideo connector as well as rca connections for composite and audio L/R and the 3.5mm connector it has now. I do no want to solder to another cable or system (I want to be able to use any source and not be limited to one).

[Stab]

Thanks for the tutorial! I setup Svideo for my PC but I have a problem, I get vertical bars on my screen that really look bad.





Sorry for the (lack of) focus in the pics, Im sure most of you know how hard it is to take a decent picture of an LCD. Has anyone else experienced this or know how to resolve it?

[segasonicfan]

yea i have...haven't devloped a fix for it yet though Oddly, my PS2 modchip seems to have fixed the problem with Y correction...

I was working on a very hard mod last week to get the monitor to think RGB mode but strip the sync from a composite signal (to get rid of the PS2 RGB green tint), however you might want to do the reverse. I can help a little....the LTS chip that no one can find a schematic for handles the screens mode. +5v (logic hi) on pin one is Composite input. GND (logic low) is RGB input. You can fool it into taking composite sync from your computer possibly and take just the other video information from the Composite signal. To do this I would say add +5v to pin 1 of the LTS, input composite from the video point by the AN chroma encoder chip and cut the preceeding traces. Then feed in the Sync line though I'm not sure exactly where....maybe to the MB TFT controller.

eh...it's a hard mod ;P

-Segasonicfan

[Stab]

That wouldnt work because my videocard is too stupid. It barely outputs Svid most of the time.

By the way, What are the R_YIN and B_YIN near where the luma gets connected? The way they're labeled it would seem like component, but the manual you have doesnt say anything about it really. Component would be awesome.

[segasonicfan]

doesn't work. You need to tell the chip to enter the component mode via programmed I2C bus.

-Segasonicfan

[daguuy]

are there verticle lines on s-video no matter what you use or is it just with that computer?

[Stab]

Well I dont have anything else to test with, and it looks fine when I use my computer on my 1080p projector. Also, segasonicfan said that he has the problem too, so im guessing it has something to do with the way its wired up.

[Harshboy]

Just finished taking the pics It's a pretty simple mod to do and I made the pics self-explanitory:



Just disconnect that one side of the cap. This disconnects the chroma and luma inputs from eachother.



Connect Luma to the Composite signal in. This will switch it out of Analog RGB mode (I believe it detects the Sync line).

And voila! Ground your S-video (obviously) ans you're good to go =)

-Segasonicfan

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?

[Turbo Tax 1.0]

you have to disconnect the one end of the cap so no you cant remove the whole thing yoiu have to be semi careful

[Harshboy]

but wut if it does come off? Am i screwed? Is my screen dead?

[Turbo Tax 1.0]

let me guess, yours came off?


its no big deal just put it back

[Harshboy]

yea, it came off.......i just put the wire under the thing( on the left side) and taped it back on for now.....should be fine...i hope So how do i get the cap off, instead of just prying the whole thing off? It's way too small!

[Turbo Tax 1.0]

try heating the one end with your iron and prying it up with a mini screwdriver try not to leave it taped its really not to secure, you dont wanna have it fall off and short is what i mean

[segasonicfan]

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