Troubles with AES and Sony TV

Ok, let's explain it. My TV is a Sony, big model, 4/3 wich can switch to 16/9. The trouble is that with my modded AES it's always switching between 4/3 and 16/9. I use a RGB cable, and all the RGB i've tried made this. Cinch and S Video don't. Any idea?

open up the scart plug and unsolder or cut the wire to pin 8, see if that fixes it. pin 8 is the 4th top pin from the left if the longer side is pointing right and is at the top, looking at the plug from behind.