I have a tablet from a friend apad, iRobot RK2808 I have a power cord however it seems the friggin pin inside the DC hole is starting to come apart so now it won't charge at all. Hence why my friend gave it to me. I tinker in electronics all the time but this thing I just don't know. I wasn't aware I could simply take the back off. How in the world are you unscrewing this without screwing up the front of the case or screen and how are you getting a small screw driver in there ?