Bought a used 3g iphone for my wife after hers was not repairable from being dropped. The mike didn't work on the used phone so no one could hear her talking, otherwise the phone worked great. Found IFIX on the web and shazam, I had a way of tinkering with a repair.
The repair was fairly simple. It was just a matter of taking a few screws loose, popping some parts out and reversing the order in which I started. Except for dropping ONE of the screws. Took awhile but I found it and everyone can hear us NOW!
Use the videos because they SHOW you how to do the repair or replacement of the parts. If you can't follow the guides or videos, then you should wrap some C-4 to your device and buy another one. If you're like me you have a tool for everything, but if not their tool kits are GREAT!
Thank you Ifix for saving the world.