"Intermittent USB Power Port - Common Problem"に関する回答You could try to open it up and reflow the solder around the USB jack. It may be that these connections have a cold solder joint or 2. There are 4 small pins coming out the back. Also, both sides are soldered down to provide ground to the outside of the USB. If all of the connections are good, you could putt some supper glue around the jack to try to hold it to the board better. Our Kindle Fire was plugged in, charging when it fell about 3 feet onto the hardwood floor. It landed right on the cord where it was plugged in and bend the USB end of the cord. When I took it apart, I found that the USB jack had completely broken off with 2 of the pins still connected to the PCB. With some jerry rigging and fancy soldering, I was able to reconnect it to the board and it worked! I was surprised and my wife was thankful. The USB port is a weak point with this tablet... and most devices these days.