NOKIA N 80 MMC WAYS

Here is two picture about your nokia n 80 mmc. In two picture you can see the mmc ways and you can solved your problem. You should also check the red marked parts for your mmc problem.

NOKIA N73 MMC PROBLEM SOLUTION

In the 1st picture:- Check the red marked IC. If this IC damaged you can make this jumper.
In the 2nd picture:- Re solder this UI connector and change all red marked IC.