OK so i bought this broken nexus 7 off ebay with intents of fixing it, he gave me two lcds, one(good lcd, bad digitizer) and two(okay lcd, good digitizer). upon trying to charge it, nothing appears or lights up. And if trying to turn on, it displays an empty battery icon. i opened it up and disconnected the battery to see if i could bypass the battery to run straight off the usb, no luck. i am thinking its a bad charging port. Any ideas?