S-video mod

[Jorge Nuno]

Pin 15 is chroma and pin 16 is luma. The mod in this case is really simple, you just need 2 resistors and 2 caps maximum.

[villahed94]

Jaxmazon, don´´t worry my explanation works both for CXA1145 and MB3514, they have the same output and pinage

[jaxmazon]

Right I just finished modding my megadrive with s-video and I was unsucessful I don't understand what I did wrong I soldered everything correctly. I did however not use a PCB mountable s-video connector could this be the reason its not working? my tv detects that there is s-video but when I turn on my megadrive nothing happens and yes I have a game inserted.

[SithWarrior]

Hi if I were to do this mod would I still able to use the RGB scart cable in the future?

[villahed94]

Of course sith, rgb can still be used. but jax... is the soldering point fresh? No pin shorting? Are the minicaps in good state? How many W is your soldering iron? The last one matters because I killed 2 Genesis with an 80 W iron!!

[SithWarrior]

Thanks villahed for the reply once I get some time and the parts I'm gonna try this out on a VA6

[villahed94]

You´re welcome, add some rep if it was helpful!

[Kingbuzzo]

I did the mod based on the Jamma Nation X tutorial with the kit they sell.

they posted kit instructions here. Keep in mind that the mod is for a Neo Geo AES but it uses the same CXA1145 encoder chip.

A word of advice, on my Model 1 Revision 1.5, I had vertical lines all over the place. I added a 1k B pot to the chroma line in between the 4pin din, and the positive leg of the capacitor. I usually have it set around 480-500 and sometimes more.

My mod...



The image truly does look great though. Scanlines and colours coming in beautifully.

I also used their guide plus a few emails of their own guidance to have only one AC adapter powering both the model 1 Sega CD and model 1 Genesis. I used a 9V 4.5a PSU for some Nikon Camera and a 2.1mm power barrel daisy chain that guitar stores will sell for Effects pedals. Just had to make sure I had it was centre negative.

Long story short, my eyes are happy, and so is my wall outlet!

[jaxmazon]

Of course sith, rgb can still be used. but jax... is the soldering point fresh? No pin shorting? Are the minicaps in good state? How many W is your soldering iron? The last one matters because I killed 2 Genesis with an 80 W iron!!

Hmm my iron is 50w so that can't be the issue.. Could it be that I have put the transistor on a board? I did it this way since it easier to solder for me

[Jorge Nuno]

Try connecting pin 16 and ground to the Svideo plug directly. It should give you a B/W image, if you did it right.

[jaxmazon]

Try connecting pin 16 and ground to the Svideo plug directly. It should give you a B/W image, if you did it right.

hmm okay but the bottom to pins of s-video are grounded? before you said that all I needed to do it use 2 resistors and two caps could you explain this further please. You said I do not need a amp I am using a transistor is that wrong? btw thx everyone for the help so far I will give everyone rep

[villahed94]

No, 2n3904 works well

[SithWarrior]

Another question would anyone know where I could get a the S video Jack in Canada?

[Kingbuzzo]

Another question would anyone know where I could get a the S video Jack in Canada?

I don't know where to source the gold plated jacks, but you can buy them in the mod kit that Jamma Nation X sells. That'd be your best all in one solution.

Otherwise, I consolized a 2 slot MVS with parts from Digikey.

buy the par here..




You can either mount them with the nut inside or outside whereas the gold plated ones only mount one way and require some very fine rotary tool (dremel) work to make the mounting flush with the case.

The svideo jack is in stock here..

http://search.digikey.com/scripts/Dk...ame=CP-2840-ND

[Jorge Nuno]

hmm okay but the bottom to pins of s-video are grounded? before you said that all I needed to do it use 2 resistors and two caps could you explain this further please. You said I do not need a amp I am using a transistor is that wrong? btw thx everyone for the help so far I will give everyone rep

For testing, you dont need anything, just wire Y and Gnd (yes both bottom pins are Gnd).