PSOne(NTSC J) displays no color for PAL CDs

[REDFlELD]

I have a japanese PSOne console modded that can play all region PS1 games but for PAL games it displays black and white only. I'm using a multi region TV btw so I'm guessing I have to solder something to make my PSone display PAL color correctly.
Can someone direct me to a website detailing how to fix this problem. Thanks in advance.

[Emanuel]

Your SCPH-100 PSone doesn't have the colour correction modification done.
So it outputs two video signals:
- NTSC 60Hz, 3.58 MHz colour carrier (standard for NTSC)
- PAL 50Hz, but something different from the standard 4.433 MHz PAL colour carrier. This happens in PAL mode because the quartz crystal and PLL used in the SCPH-100 are specified for NTSC frequency only. The TV can't detect this nonstandard frequency of the colour carrier and you have black and white on PAL games.

You have to do the colour modification so your PSone will output the following:
- NTSC 60Hz, 3.58 MHz colour carrier (standard for NTSC)
- PAL 50Hz, 3.58 MHz colour carrier (standard for NTSC)
Your TV must allow a 50Hz video signal (PAL standard) with a 3.58 MHz colour carrier (NTSC standard).

The modification is done by cutting one track on the back of the motherboard and by linking one pin of the video generator IC to 3.3V as in the following picture: