My GF has just dug up her old PSX (Aus PAL) which is chipped but when we tried playing a few NTSC games they all display in black and white. I remember when I got my PSX (SCPH-5002) chipped many moons ago, I had to get a 'colour correction' chip as well as the modchip to allow NTSC games to be played in colour. It definitely isn't the TV as I know its NTSC compatible and we tried 2 different TV's.
The PSX is a SCPH-9002 and from memory these ones only required 2 points to be soldered together for colour correction? I've tried searching the web for some diagrams or intructions but have come up short
Thanks.