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If thelaptop battery is more than 3 - 4 years old then the battery could be worn out.Rechargeable batteries have a finite number of charge and discharge cycles andwill lose their charge capacity over time, i.e. won't charge to 100% andgradually the charge reduces until the battery won't charge up at all. OR Thebattery shows a 100% charge but when the adapter is disconnected the batterydrops off to zero capacity in a very short time. If the battery drops to anunacceptable charge level then the battery needs to be replaced.
chek the adapter and female power soket on laptop. if they are ok, clear the bios by reset bottom(there is a small hole under laptop) or removing small battery on mainboard.if the problem not solved ,have to change the mainboard.
The Power Charging Board Is Usually Known As A PWS Board.
It should have a model Number Stamped On It. you type this into a blank webpage and do a search. this will give you the model Number i.e PWS 13 OR PWS 15 et,c.