Before changing anything on the phone you should check the charger wire if its ok by trying another wire, you said that a while ago the phone was charging at a certain angle, if the wire was destroyed from the inside thats perfectly normal and its not the phone problem. Also check if your battery is working properly and at last check your charger by trying to charge your phone from your computer. If the wire, the battery and the charger is ok then you should consider change the usb board.