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Thread: sega Genesis s video mod help

  1. #1
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    Default sega Genesis s video mod help

    So I am planning on doing a s-video mod on my Sega model 1 it has a Sony cxa1145p video chip.I plan on using it on a Polaroid LCD TV 1080p.
    Now with that being said I have looked all around the web and every mod I look at is different in some way one says I need 2 npn the next says only one 1 says 1 33 ohm resistor the other says 23 or 27.
    So if you have done this mod and have it working on a like model TV can you please tell me the parts you used in what order you put them or post a link thank-you

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    Here is a link: https://cooltrainer.org/2011/06/17/m...ve-over-drive/
    This also has instructions for overclock and region switch, but I've never done those, just s-video and comp/stereo jacks.

    Modded around 6 or so gennys this way, and gives excellent results. I pulled +5v from pin 12 of the cxa1145 though, but it doesn't really matter where you get it from.

    Here is another link to instruction for Neo-Geo that is done exactly the same way as the Genny (as it has the same cxa1145 chip) with good pics:
    http://www.jamma-nation-x.com/jammax/neogeosvideo.html

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    Default S-Video mod Diagram

    Here is a diagram I made of the S-Video mod I used for my Genny

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    Last edited by Altair8800; 01-22-2013 at 11:32 AM.

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    A few things I should point out with that diagram...
    1: You don't have to grab 5V from either of the 7805s, you can get it straight from the CXA1145 from either pin 12 or 19. The second pin of the 7805 is actually ground so you don't wanna do that.
    2: The negative lead of the capacitor for the chroma section should be towards your output, not your input.
    3: A breadboard is actually totally unnecessary, you can solder everything directly to the CXA1145 and it'll be fine. Doing that cuts down on interference too since you don't have extra wires laying around.
    4: This mod is actually applicable for *any* system that uses the CXA1145, including the SMS, X'Eye and Neo Geo AES.
    Last edited by ApolloBoy; 01-22-2013 at 05:23 PM.
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    I have a model 1 Genny on its way to me, and I'd really like to mod it for s-video, but I've never soldered anything in my life.

    Can you ruin anything with a botched mod/soldering job?
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    Quote Originally Posted by Gentlegamer View Post

    Can you ruin anything with a botched mod/soldering job?
    Hell yeah, you can! I would not try this unless you are fairly good and have some experience.
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    Quote Originally Posted by MachineGex View Post
    Hell yeah, you can! I would not try this unless you are fairly good and have some experience.
    Agreed.

    This is not for someone who's never done any soldering before. The fact that you asked tells me you should get some experience first, or send it to someone to do it. However, I've a better suggestion for you. Get an RGB cable, an RGB to component converter, and an RGB switch so you can run audio. No soldering required, and it will have a higher quality picture. I would suggest the stereo mod and running RGB to component. I just don't get going to all the trouble of converting to s-video to be honest.
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    Quote Originally Posted by Polygon View Post
    Agreed.

    This is not for someone who's never done any soldering before. The fact that you asked tells me you should get some experience first, or send it to someone to do it. However, I've a better suggestion for you. Get an RGB cable, an RGB to component converter, and an RGB switch so you can run audio. No soldering required, and it will have a higher quality picture. I would suggest the stereo mod and running RGB to component. I just don't get going to all the trouble of converting to s-video to be honest.
    Are there specifically recommended cables?

    I'm finding SCART cables that would then need a converter for component, s-video, etc.
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    Quote Originally Posted by Gentlegamer View Post
    Are there specifically recommended cables?

    I'm finding SCART cables that would then need a converter for component, s-video, etc.
    Yes, you're going to have to use a converter cable. SCART cables are for RGB which needs to be converted here in the states. So, you will need the SCART cable and a converter. Any cable should be fine for a Genesis.
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    Quote Originally Posted by Polygon View Post
    Yes, you're going to have to use a converter cable. SCART cables are for RGB which needs to be converted here in the states. So, you will need the SCART cable and a converter. Any cable should be fine for a Genesis.
    Being from USA, I have no experience with SCART connectors, such as what the male and female look like...

    Would this http://www.ebay.com/itm/Sega-Megadri...item1c22478a02

    Connect to this http://www.ebay.com/itm/DN00-New-RGB...item484d71be75
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    Won't fit. That would be connecting male to male.

    The box you linked is for TVs who accept s-video from their SCART input. It doesn't do any format encoding.
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    Quote Originally Posted by theclaw View Post
    Won't fit. That would be connecting male to male.

    The box you linked is for TVs who accept s-video from their SCART input. It doesn't do any format encoding.
    Yeah, I thought those both looked like male connectors.

    I think this is what is needed for conversion to component: http://www.ebay.com/itm/NEW-SCART-RG...item337dfa167b
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    Yeah the most basic type. It only transforms RGB to component. No upscaler, scanlines, picture resizing, or other gizmos to deal with. Any of that you can add your own as necessary.
    Like 240p 60hz input, will remain 240p 60hz output. Etc.

    An audio adapter is important to remember though!
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    Quote Originally Posted by theclaw View Post
    Yeah the most basic type. It only transforms RGB to component. No upscaler, scanlines, picture resizing, or other gizmos to deal with. Any of that you can add your own as necessary.
    Like 240p 60hz input, will remain 240p 60hz output. Etc.

    An audio adapter is important to remember though!
    Which is why I'm going to mod my Genesis with stereo outputs on the back. Well that, and to get actual stereo. However, is there a converter you'd suggest that handles the audio as well?
    Atari: 2600, Jaguar
    Microsoft: X-Box, X-Box 360
    Nintendo: NES, GB, SNES, N64, GameCube, GBA SP, Wii
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    Sony: PS1, PS2, PS3
    Wanted: 5200, 7800, GBC, 3DS, Wii U, SMS, Nomad

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