rev a cube sound but no video please help

[itspietime]

its a rev a cube and i cut from the gba port to the a/v port just next to the diagnal line connected to the a/v and i need to know where to relocate the video to pleas help thanks
UPDATE: i im getting a signal now back its really dark and flaxy looking

 

[carbsdog]

variable resistor mayhaps? might not even help just a suggestion

 

[Abb_eliten]

PAL or NTSC board?

Sounds like you might have got a hold of one of the S-video or RGB lines instead of composite video.