DC VGA cord problem

[rana]

Hi i try to make my own vga cord for my Dreamcast
i buy a RF UNIT to take out all the necesary signals and i think i do all correctly but i have a problem  the  image looks like a negative picture if i disconect the ground looks ok but too dark  maybe is a ground problem  but im newbie on this  and i dont know what can i do
Thanks for any help

Sorry for the bad english because i speak spanish

[rana]

i`ve fixed the problem using a 120 ohm resistors through the syncronization signals
Thanks every who have been read my post

[kendrick]

Does anybody know if the problem with lack of brightness is also present in some of the commercially available VGA adapters? I just got a brand spanking new 10-inch VGA monitor for Christmas (portable gaming, ho!) and I've noticed that the whites are bright, the colors are vibrant but the shading is overwhelming. Just curious to know if anybody else has applied a similar fix to non-homebrew boxes.

-KKC, who has a 20-pound frozen turkey and can't think of a thing to do with it that doesn't require hours of preparation...