the Nokia x3-01 solution for USB not charging problem that doesn't respond or shows no charging indication when the USB charger is being plug-in.
To fix this kind of problem you may need to use another working battery charger first, then clean the USB pin connector for possible oxidation build-ups due to sweat and or moistures.You can easily determine it when there is a greenish color surrounded beneath on it.
Then proceed to hardware troubleshooting if the above steps already been done but doesn't solve the problem. Refer to this solution below and locate the highlighted components on the PCB board.