NTSC to PAL problem

[Plaguebearer]

I got a little nasty problem. I have a NTSC/PAL multiselect widescreen tv set and a PS2. Its chipped (Neokey) and I use the Action Replay 2 (v1.6) for my backups. The psx backups I use (PAL and NTSC) are running just fine without any problems. If I run a PS2 NTSC backup the screen just turns into black & white like it can't handle the NTSC input! I tried patching some backups with a NTSC->PAL patch but it does not help. Do I need a special RGB SCART cable or something? Any help would be great!

thanx in advance!

For info: I got a V4 PS2 (PAL) with AR2 v1.6.