July 10th, 2009 
fix Here’s the way to modify Verizon music essentials kit for the LG VX8100 to let it charge the phone via USB:
Disconnect the cable from phone, USB port and AC adapter! After this, there is no reason to worry about zapping your computer, phone, adapter or anything else because of currents running to your grounded soldering iron, or because of static electricity (there are no electronic components in the cable that are sensitive to static electricity).
Open up the junction box in the middle of the cable, there are 4 screws (two on each side). Once you have done this, don’t jerk the cables around too much to prevent breaking the wires right where they’re soldered to the circuit board.
With the connector towards you and the wires going left and right, you should see a circuit board that’s connected to the USB connector via 4 wires on the left, and to the phone via 7 wires on the right (plus two wires at the other side of the circuit board but we only need to access the top).
The 5V power from the USB is connected to the topmost contact on the left with a red wire, the 5V power from the AC adapter is connected to the phone’s charging inputs via contacts 6 and 7 on the right with brown and red wires. You have to connect the diode (or piece of wire, see above for warnings) between USB power output and charge power input. The side of the diode that has the black or wite ring (or the line if the diode only has a symbol that looks like a triangle with a line attached to it) should be connected to the charge power input of the phone, the side without the ring (or the side that’s closest to the triangle) should be connected to the USB power. Don’t worry if you get the direction of the diode wrong the first time, you can always desolder it and turn it the other way if it doesn’t work. Make sure the wire(s) that you add don’t touch any other contacts than the ones they are supposed to touch!
Optionally, if you don’t always want to charge via USB, you can put a switch between the diode and one of its connection points (or between the connection points if you don’t have a diode). If you can find a switch small enough to fit in the junction box, that is — I didn’t have one so I just used the diode.
That’s it! As soon as you connect the cable to your computer, the phone will start charging. When it’s done charging, the phone will show a message saying it’s fully charged; that message may be shown more than once because you’re draining the battery because you’re using it to do cool stuff, right?
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