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KNC USB Port

Device: KNC MD903 9 inch tablet
Repair: USB port broken

Repair

AXP209
The tablet would not boot up after replacement of the USB socket. The chip outlined in red would become untouchable hot after about 20 seconds with the battery was connected. This chip is an AXP209 and controls all of the power and charging functions for the tablet and is common among the Chinese tablets with the A13 processor. Finding no other faults that would cause this chip to overheat, it's probable that the chip has failed. This chip is only available from China but I do have a few coming.

AXP209

New Micro USB socket
New Micro USB socket soldered onto mainboard

New Micro USB socket

Circuit board removed from tablet, close up of connection point for the USB receptacle

New USB Socket

Tablet disassembly

Circuit board

Circuit board removed from tablet, close up of connection point for the USB receptacle

Circuit board removed

Broken USB receptical

USB receptical

USB receptical damage
You can see the USB receptical is at an angle and pushed back, it has clearly detached from the circuit board.

USB receptacle detached from board

Tablet back removed

Tablet back removed