Power Regulator or IC

My PC is HP ProBook 645. I plugged in a charger that produces less voltage than required. Finally, the power Regulator/IC which is connected to the source power terminal got burned such that the serial number cannot be seen and the PC is not turning ON. (I don't know even the serial number of the PC generally). If anyone has a similar laptop HP ProBook 645 please help me with the serial number of power Regulator/IC.