Replace power USB cable tutorial
From Wiki
1.Place the Raspad on the reverse side and Open the Raspberry Pi cover
2.Uncover the silicone pad and unscrew the screw 3.Repeat step 2 until all is complete 4.Open the back cover 5.Unscrew the screw 6.Unplug power USB cable 7.Replace with new power USB cable 8.Screw on 9.Place power USB cable in the correct position 10.Screw all the screws and attach all silicone pads 11.Complete power USB cable replacement