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DC jack, where you plug the power adapter cable, might be loose or
defective, & needs to be either re-soldered or replaced. In order to do this, the laptop needs to be disassembled
& the motherboard taken out. Also, the motherboard needs to be checked for defective/burned out components in the
area near the DC jack. Any defective/burned out components found should
be replaced, or you might need to replace the laptop's motherboard
Alternatively, the charger wire just next to the charger head might be damaged. Some wire has frayed apart and is making intermittent
contact with itself. This could be fixed by either replacing the charger with a new one, or replacing the charger head & the few centimeters of the wire connecting it to the charger & re-soldering a new charger head instead.
In order to fix this problem, you will have to fully disassemble your laptop to get access to the motherboard & the power jack. If the power jack is not broken but only loose, you can re-solder it to the motherboard. Otherwise, you will need to buy a replacement power jack (usually less than US$ 10), de-solder the broken power jack, & then solder in the new one. When this is done, re-assemble back your laptop.
If you want to get a new charger all you need to do is to get to a computer store and look for the charger that is compartible with your system.In order for you not to make the wrong choice i would suggest that you carry your system along when going.
But before you buy a new battery, You need to again repair the power plug where your adaptor's plug is inserted so that it will not create any problem later. There might be loose connection or sort wiring.. Good luck..
Hi, I'm sorry to say that your initial fears are correct and the pin that the adapter connects to in the laptop is loose. This is a common problem with laptop's and can be easily dealt with. Now I'm not going to tell you to open the laptop up and de-solder the adapter (unless you want me to). Because this is a fiddly job and you have to order the correct adapter i recommend you take it to a reputable repair store and have them replace the adapter for you, don't let them tell you that you need a new motherboard as this is not the case at all, adapters can and do get regularly get fixed and is not that expensive.
I had to buy an new ac/dc plug piece off of ebay (cost only like $3 bucks) to sodder onto the mother board of my Acer. Somehow the little plastic/metal piece you plug into your computer comes off the mother board really easy. Acer wanted me to purchase a whole new mother board (at frigging $350), which, frankly wasn't an option. So I bought the little plug gizmo, soddered it on, and I'm doing good now.