Before you can even think of disassembling any Nintendo device you have to face the same problem with every console except the Wii: the screws of the enclosure. And the most tricky fact of these screws is their type because this is not a reasonable standard screw.

These four screws I'm talking about are a compound of a flat plate with a thicker convex layer with six notches in the brass.

This bit is a Nintendo Reduced E Series bit size 8. Found at http://eazypower.com/shop/nintendor-tee-...

I couldn't find anything suitable in the internet, so I built one on my own in this way:

Using a steel rod of about 8 mm diameter.

I tried to mill three teeth with equivalent distance around the boundary of one end of the rod with an angle grinder. After that I drilled a hole perpendicularly in the center of the rod. Taddaah... a working screwdriver!

Now let's begin the Teardown.

Make sure to have a game disc inserted to avoid damaging the lens. Flip the unit upside down and remove the screws sitting in the four holes with your possibly self-made screwdriver. Don't remove the enclosure yet!

Turn the device on its stands again, now lift the top case off. It'll come up easily.

Unsnap the controller port cover and the rearmost I/O-cover by unsnapping the two snaps on the sides of each cover. Don't remove the controller panel yet.

Then remove the heatsinks of the memory card slots (necessary step).

Now start removing the 'normal' Phillips #0 screws.

Start by removing the fan assembly.

then unscrew the 12 visible screws on the edging of the now not any more so cubeshaped GameCube.

Now you can lift the drive assembly up. You maybe have to loosen it a bit with a screwdriver or a heavy duty spudger.

The mainboard is now visible.