I'm not aware that the Jap PS2 will accept the NEO2 modchip. I have used since XMAS the MODCHIP.COM chip which uses the "swap trick" (search on this forum for those key words).

www.modchip.com

I also use an NTSC-PAL convertor (bought from Maplins) to play NTSC games on a PAL TV via the AV cable