What you need:
Tri-wing Screwdriver
Flat head Screwdriver
Precision Phillips head Screwdriver
Razor Knife (Exacto, Stanley Knife): optional for removing paper feet undamaged
Container for screws
Step 1:
Remove the controller port and memory card doors.
To do this, open the doors and push them towards the top side of the console, then pull out.
This does not take much force.
Step 2:
Turn the console upside down.
Remove the two plastic feet carefully with the flat head screwdriver.
Remove the two paper feet with the razor knife.
Remove the four tri-wing screws that have been uncovered with your tri-wing screwdriver.
Step 3:
On the side with the serial number:
Remove the plastic foot
Remove the paper foot
Use the Phillips head screwdriver to unscrew the battery screw and remove battery.
Step 4:
Remove the black Phillips head screw that is under the plastic foot.
Remove the triwing screw in the battery compartment and the screw from under the paper foot.
At this point, there is only one screw holding in the faceplate (The part with the buttons),
so handle carefully.
Step 5:
Turn the console so that the controller ports face you.
Remove the three black screws with a Phillips head screwdriver.
Remove the two shown in blue first.
Remove the one shown in red last. It is holding on the faceplate.
Step 6:
Carefully remove the faceplate by pulling out slightly and then laying down as pictured.
Unplug the connector cable.
Try not to use too much force.
Step 7:
Back on the controller port side, remove the black controller port cover.
It comes off very easily if you pull from the top memory card slot.
Step 8:
Underneath the controller port cover you will find more screws.
Using the tri-wing screwdriver, undo the two screws as pictured.
Step 9:
Remove the top plastic cover by pulling up gently on each of the four corners,
then lift straight up evenly.
Note: that when re-assembling, there are metal tabs on both sides of the lid that you may have to push inwards slightly before the lid slides into place.
Step 10:
Remove the four dvd drive screws.
It is better if your screwdriver is slightly magnetic for this part.
Step 11:
Carefully lift dvd drive up enough to fit your fingers between the drive and the motherboard casing.
At this point you will feel some resistance. This is caused by one of the dvd drive cables getting caught on a piece of plastic.
If you look into the gap you have made you should be able to see it.
Slide your hand in there and gently pull the cable forward, then continue lifting, but only lift the side farthest from the controller ports.
Disconnect the wire cable by pulling it straight out. The ribbon cable is held in place by a hinged connector. Use a fingernail to pull it up and unlatch it.
Congratulations.
You have disassembled your Wii.
Have fun.