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I like where this thread is heading
If you did find the equivalent PAL IC then that would be very interesting, i searched hi and low for it and cam up with nothing. This statement puzzels me though : From my memory, and it was a long while ago i looked into this, but the NTSC decoder IC should be all that you need to change within the tuner to get it to work. If you have found the exact PAL counterpart for the original NTSC IC, you should only have to change this part of the tuner to have it work with Australian PAL encoded TV signals (of course there are the accompanying crystals and other external components that will need to be modified to). So i don't know what else about the tuner you are refering to that concerns you?
If your talking about tuning in the correct TV channel frequency then there is nothing to change, as all the 'tuner' part of the TV tuner does is tune in the selected frequency, the decoder IC's do the rest and are the part that doesn't allow the tuner to work here in Australia. So tuning in 209.25MHz (Channel 10 video carrier here in Sydney), is no different to tuning in 209.25MHz in Japan which may be station 'XYZ', its just the decoding that is different.
I havn't looked inside the navi unit, touch screen display or radio unit yet, although i do have a complete set in my garage to play with. The only thing i looked at was the tuner, and i took pictures of all IC's in it so i could try and work out the circuit and what needed to be replaced.
Yes with an expensive convertor ... not worth it.
Best thing is to get something that has a video out and outputs to NTSC. I bought a Zen Vision M, its a 60GB player that plays divX. Hook that up to the AV channel via the video input on the tunner box in the boot. Then u can watch wat ever u like