Ever have an Airport Express (AE) that will not power up anymore? Most likely it is from a broken power supply unit. The cause is usually from a bad 3.3v regulator and/or bad capacitors. This guide will show you how to bypass Airport Express PSU and power it with USB power. This will great if you want to use an 5v USB A/C adapter, power it off your computer, or use any other USB power source.
Here is a list of suggested tools and materials you might need:
Soldering Iron, Solder
USB Compact Flash card reader, $2 online (slightly smaller than the AE so it fits inside)
3 wires (2-3inch in length), one for ground, one for 5v and one for 3.3v.
Update: I changed the blue tape to white tape on the reassembly of the housing.