Difference Between US PS2 and JAP PS2

Computer Exchange in Rathbone Place does the Jap PS2 for around £375. Anyway, about that NTSC thing - If the Jap PS2 was as PAL as you say, how come it won't play UK DVDs? At least not on my chipped PS2.

I have noticed however that an NTSC backup will only play in colour on my PAL TV through the AV sockets if I go through an NTSC - PAL convertor and PAL backups will only play in colour on my PAL TV through the AV sockets if I bypass the NTSC-PAL convertor.

That suggests to me that the PS2 puts out what it sees on the disk.

Does anyone know any more? Especially how to get UK DVDs playing on a Jap PS2.

Cheers all