i had the same problem (no sound through the right ear)

i followed the repair guide, teared it apart and then, when i had the jack out of it i used a flashlight and a soldering iron

my guide:

use a very thin soldering iron, make it really hot, put very much solder on it

then stick it in the jack you have to be VERY FAST!!! otherwise the plastic will melt

now you have solder on the contacts and they touch the headphone plug again :)

worked fine for me, but only do this when you know how to solder!

it's a little risky but it's worth it

cheers

Markus