I have an acer aspire 4920g and charging mechanism does not charge my
battery so therefore i can not use it running on batery i wish to know
how i can fix the problem and how much would it cost me to see whether
i should buy a new laptop. first i thought its was a battery problem so i
bought brand new battery but it does not charging the new battery and then i realise that the charging mechanism
of my laptop failed coz the charging light do not turn on when i plug
in the adaptor
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Re: acer aspire 4920g charging mechanism failed
Have you tested the adapter to see if there is any power getting to your notebook period. Use a multimeter to check for DV voltage. If you can't get your multimeter probe into the middle of the plug then I use a paper click to get in there. If your adapter is not supplying any voltage then there is a problem with it. I get a replacement adapter for my wife's Acer on eBay for about $30. Just search eBay for 4920g and you should get quite a few hits for the ac adapter or power cord.
If the adapter is providing power then the motherboard in your notebook is faulty since you've already replaced the battery. A replacement motherboard might be available from eBay. Replacing the motherboard could be complicated depending on your experience so I would leave that up to a notebook technician. An Acer certified shop may also be able to sell you a replacement motherboard.
I don't think it's the motherboard, my money is on the adapter. Test it out or have it tested.
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It is most likely that your battery is shot, but you could try unplugging your power supply, popping out your battery, and carefully clean the contacts on both the battery and where the battery connects to your laptop.
if new, return it to place of purchase for a replacement. if used, the motherboard or internal problems may be the problem such as a bad motherboard, bad internal connection etc.
it may also be that the battery isn't being charged due to a bad adapter or battery. the battery may not be able to take a charge, or the charger may not actually be charging. if you have a spare charger, try it, and the same for the battery.
a green light on the charger doesn't mean it's actually doing anything. nor does it really indicate the battery is good.
Most laptops, as in 99%, have one board and everything is on it. They don't really have a power supply since the AC adpater provides DC voltage already. There is just a voltage divider that take the incomming voltage and changes it to the various voltages the machine needs. The charging mechanism is also on the mainboard. I've very seldom seen a seperate power or charging board in a laptop. Unfortunately since you've already replaced the battery and the ac adapter and since the adapter is powering the laptop then there is definitely a problem with the charging circuitry on the mainboard. This isn't something one can repair unless you start changing micro components and ICs on the board which isn't recommended. Looks like a new mainboard or a new laptop is in your future if you want it to run off battery.
Another option is to get an external battery that mimics your ac adapter but that wouldn't give you a very long run time compared to the internal battery.
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