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Unfortunately using the charger connector is the only charging method for the tablet.
If the broken plug hasn't done too much damage on the tablet motherboard, it should be fixable by soldering a new plug on the board. This operation is quite feasible to anyone a little familiar with electronics, I did it on my Arnova 10 (first generation model) with no problem.
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I have 2 Arnova 10 G2 tablets here that a friend dropped around for me to look at. Neither of them were charging and a quick inspection revealed that both of them were minus the pin in the charging port.
I did a search online for a repair solution but couldn't find anything, so I decided to strip one down and take a look, and an hour later both tablets are now charging via the USB port! Unfortunately, I didn't take any photographs along the way but it's fairly simple and I can explain the process from memory.
1: Remove the 6 screws from the rear of the case.
2: Gently pry the case apart at one corner and by pressing in along the length of the joint with something plastic and pointed, release the clips until the 2 halves are seperated.
3: Lay the tablet on its back and gently fold the screen forward from the top, until you have 2 halves connected with ribbon cables at the bottom (these ribons can be left in place or removed... I left them in place)
4: Lift and remove the camera housing, being careful not to lose the volume and power buttons.
5: Remove the tape from the speaker wire and remove the speaker by gently lifting it. (I don't think this is absolutely necessary but it probably makes life easier)
6: Remove the 4 screws from the board, lift the board and turn it upside down.
7: Solder a wire from the +positive of the USB socket (left pin as viewed from underneath) to the + (middle pin) of the charging socket. I also ran a -negative wire from the right side USB terminal to the left pin of the charging socket. I don't think this is absolutely necessary, as the components share a common earth but I think it's good practice to do so.
That's it... reassemble everything in reverse order, plug a heavy duty USB cable into a 2A+ PSU, the other end into the tablet and you're good to go!
If you don't get a solid red light when you plug in your USB (I didn't at first, it was flickering between green and red), then either your PSU isn't powerful enough or the wiring in your USB lead isn't heavy enough and can't carry enough current. I didn't have a heavy enough USB lead, so I cut it down to within an inch of the plug, cut the plug off the original charger for the tablet and soldered them together with shrink tube to protect the wires. (be careful doing this, because not all USB leads use red for + and black for - ... mine were reversed!)
I plugged the freshly butchered power supply back in and hey presto... a solid red charging light and the tablets are working 100% again!
I'll probably replace the end with a heavy duty USB lead at some stage, because I don't like the idea of the cable joint being so close to the tablet but it's working fine for now.
I can't believe these tablets never came with an option to power them from USB.
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