Nintendo NES parts

[frombauer]

I live in Brazil, and we have an unique color system here called PAL-M. It's closer to NTSC than PAL since it is 60Hz.

I have an old NES console which was, as all old consoles at the time, "transcoded" to PAL-M so it would work on our TVs. Thing is, this process degrades color quality.

But now, all TVs sold here support NTSC natively. So I want to reverse the process that was done (not by me).

Thing is, there is a board inside the NES with 3 wires soldered to different spots at the PCB. But only removing those wires does not do the trick. I suspect the crystal was replaced. The crystal is a metallic part on the bottom part of the PCB.

In this pic of a PAL unit (only one I could find), it's an orange part on the top left part of this image:

http://www.18minutes.net/kennchen/nes_pcb.jpg

The thing is, I need to know the specs of the original part... anyone can help?