Hiya. They normally burn some ic on the board. Try and get the same board and switch the damaged ic over. If that does not work the move over the NEC chip. you will need to have some kind of micro soldering skill to perform this task.

Number of faults. Start with the cheapest fix first. Check the charger provide a charge for the pc or try a different charger check the wall socket is switched on or a different socket remove the battery and plug in only the charger try to start it Board issued can be faulty mosfet charge IC faulty charge port faulty charger connection on the board