'''++@ilovelucy24680++''' check the charging port for power when you have the charger plugged in. It is possible that the port simply wore out. To replace it you would need to measure it etc. and use that information to try and match one with some ports available at mouser.com or digikey.com. Also, replace the battery while you are at it. Use [guide|55671|this teardown] to get into it. Use this [guide|21499] to add your images if you need further help, with your QUESTION.