S-video mod

[jaxmazon]

But RGB IS the best quality picture possible!

http://nfggames.com/atarilabs/meat/2...eoprimer.shtml

oh dam lol btw thats a good read thx Killbean and villahed94

[villahed94]

You´re welocme, if you have a problem, you can contact me!

[jaxmazon]

You´re welocme, if you have a problem, you can contact me!

Thanks again, I just found out something very strange and Im a bit upset lol the motherboard killbean showed is a 1992 motherboard and I have a 1993. The chip on my 1993 motherboard is alot smaller and still has the same amount of pins so Im guessing I can still do the mod on my 1993 motherboard. I also noticed that the 1992 motherboard doesn't have the JP1,2,3,4 well I couldn't see them so I can't move my switch mod onto the 1992 board . The main reason im doing the s-video mod is that my tv suffers the RGB shift where the picture is 15% to the right .

again thanks for the help guyz

[Jorge Nuno]

Seems to be like a VA6.8 or a VA7 pcb revision (or maybe an unknown one? <- In this case PICS PLZ ).

To fix your "RGB shift" you need to use the CSync signal (all RGB cables using the video signal as a sync suffer from this)

[jaxmazon]

Seems to be like a VA6.8 or a VA7 pcb revision (or maybe an unknown one? <- In this case PICS PLZ ).

To fix your "RGB shift" you need to use the CSync signal (all RGB cables using the video signal as a sync suffer from this)

CSync signal? how do I use that to fix my RGB shift? thanks

[Jorge Nuno]

Well you have to modify the cable or the connector and you also need a resistor of 0.5k~1kOhm, take out the composite video signal and put CSync with that resistor/potentiometer in series

[TmEE]

I'm now wondering how will the Csync fix the RGB shift... I have a jumper in my MD to select between the Csync and Cvideo for sync for SCART and in both cases the image stays where it is...

[Jorge Nuno]

Well yeah there isn't any difference, I appologise.

I guess my TV was calibrated already for the MD

[jaxmazon]

Well yeah there isn't any difference, I appologise.

I guess my TV was calibrated already for the MD

no worries thx for help btw I giving rep for people who try to help . Anyway Im gunna try to mod my megadrive with s-video asap when I finish I will post pictures

[cityofc]

I would be interested in seeing pictures and getting your opinion of the difference in video.
Thanks.

[villahed94]

Ok, post us, but try TmEE´s csync, it should work no more off-centered screen.
By the way post pics of image and board, the chip it´s maybe a smaller version of the cxa1145, it should work as well.

[MindController]

NOOOOOOOOOO
DON´T try that mod, use jamma-x nation one, it is easier and delivers an even better image. Just google it.

I wish I had seen this thread when I started and failed my first two attempts lol.

Yay for easy mods!

[jaxmazon]

Ok, post us, but try TmEE´s csync, it should work no more off-centered screen.
By the way post pics of image and board, the chip it´s maybe a smaller version of the cxa1145, it should work as well.

Okay heres a megadrive board that I have that uses the normal cxa1145 chip


By ssj4jaxmazon at 2010-09-13

and heres the board I am using which has the switch mod installed and the small chip (I know its messy lol)


By ssj4jaxmazon at 2010-09-13

heres the chip upclose sorry for blurry picture


By ssj4jaxmazon at 2010-09-13

The chip has the same amount of legs as the cxa1145 so I guess the s-video mod will still work.

[Jorge Nuno]

Your second board is a VA6.8 and you don't need any amplifier for the SVideo lines with the MB3514.

(If you think your console is messy, you should see mine... )

[jaxmazon]

Your second board is a VA6.8 and you don't need any amplifier for the SVideo lines with the MB3514.

(If you think your console is messy, you should see mine... )

what do u mean? how do I do the s-video mod?

(actually ignore that question lol, do u know what number each leg is?)