My laptop keeps turning itself off

FrankH said:
Hi,

I've got a similar problem for my laptop (acer aspire 8930g)
When I boot up the laptop on just the battery it boots up fine and I can do whatever I want but as soon is I plug in the AC it cuts out (dead without a warning or following the shutdown process). If you wait a few seconds the laptop automatically turns itself on again but cuts out again when you see the windows logo for the first time. This process will repeat it self until you take the AC adapter out, then it will stay off.

in short, the laptop works with just a battery but doesn't work if you have the battery and ac plugged in and doesn't work when just the ac is plugged in.

It looked like I had a bad AC but I've tried 2 other ac's from friend who use the same laptops but neither of them works. I've taken apart the whole laptop and looked for broken resistors etc and found one which has been replaced now. This however made no difference.

It can't be a heating problem because there is no dust left on the heatsinks/in the fan, the fan is spinning and the problem only occurs when you boot the laptop with the powercable plugged in.

Any ideas on what it might be? which parts on the motherboard would I have to look at? I've checked the voltage on the motherboard where the power from the ac comes in to but this all seems fine. I thought about relaing the wires to where the battery plugs into the motherboard but I can't do this as for some reason the voltage is different (ac = 19v and the battery is only between 3 and 4 volts...)

Any help would be appreciated!
Click to expand...
 
SS123 said:
Hi Frank,

I have acer aspire 4736z laptop and I have exactly the "opposite" problem as yours. I.e. when my laptop will run on AC power but will abruptly shut down on battery. On AC power it works fine, but the moment the AC power is switched off, the laptop will run for a few minutes (random time, but less than 10-12 mins) and shut down without any warning etc.
I thought the it was some problem with the battery, hence got a new one. But realized that with new battery too the same problem remained. Took my laptop to a local repair shop, they reinstalled the OS. But the problem remained. It works on the battery in the BIOS setup mode or even on the windows Safe mode, but the moment the OS is loaded it shuts off on battery.
It is not related to heating issue as it runs perfectly on AC power, it is only on the battery that this problem comes.
I visited another repair guy and he said that it was some hardware issue. But I am yet to decide whether to give my laptop to him for dissection.
If you have come across some solution or have got your machine repaired kindly advice on the course of action.
Thank You
Click to expand...
 
Could it be some hardware issue as what the local repair guy was suggesting?...
Yes, motherboard...
 
My laptop is doing the same thing cutting off by its self. I downloaded the link to get my temps. Can you tell me if they are good or not
 
FrankH said:
Hi,

I've got a similar problem for my laptop (acer aspire 8930g)
When I boot up the laptop on just the battery it boots up fine and I can do whatever I want but as soon is I plug in the AC it cuts out (dead without a warning or following the shutdown process). If you wait a few seconds the laptop automatically turns itself on again but cuts out again when you see the windows logo for the first time. This process will repeat it self until you take the AC adapter out, then it will stay off.

in short, the laptop works with just a battery but doesn't work if you have the battery and ac plugged in and doesn't work when just the ac is plugged in.

It looked like I had a bad AC but I've tried 2 other ac's from friend who use the same laptops but neither of them works. I've taken apart the whole laptop and looked for broken resistors etc and found one which has been replaced now. This however made no difference.

It can't be a heating problem because there is no dust left on the heatsinks/in the fan, the fan is spinning and the problem only occurs when you boot the laptop with the powercable plugged in.

Any ideas on what it might be? which parts on the motherboard would I have to look at? I've checked the voltage on the motherboard where the power from the ac comes in to but this all seems fine. I thought about relaing the wires to where the battery plugs into the motherboard but I can't do this as for some reason the voltage is different (ac = 19v and the battery is only between 3 and 4 volts...)

Any help would be appreciated!
Click to expand...
 
Hi, I have just read your thread and am having exactly the same problem with my Acer Aspire 8920g. Have you had any luck because if you have sorted it I would like to know how!
 
Tmagic650 said:
The motherboard is bad...
Click to expand...
Hi,
Thanks for the reply. Why, if it runs perfectly well on the battery is there a motherboard problem. Also I have a new ac supply and a new battery which would not charge which I returned. Same problem with the new battery. The old battery which is on its way out still charges up.
 
The motherboard also has the AC input circuits to change the AC to DC current for use in the laptop like the battery supplies. These AC input circuits on the motherboard are damaged
 
In the case of laptop batteries it's worth considering a possible complication where the computer manufacturer has taken steps to make it very tricky to install a cheaper replacement unit from a third party supplier. I haven't much experience with laptops but am acquainted with this in the now discontinued range of Sony Vaios.

Apologies for simply posting a link but anyone with a Dell laptop might be well advised to look into this. It's a pretty involved issue and typically the computer manufacturers' tech support are unhelpful. Unsurprisingly they want to tie consumers to their expensive replacement parts.

http://nctritech.wordpress.com/2010...-ac-adapterschargers-hardware-vendor-lock-in/
 
bazz2004 said:
In the case of laptop batteries it's worth considering a possible complication where the computer manufacturer has taken steps to make it very tricky to install a cheaper replacement unit from a third party supplier. I haven't much experience with laptops but am acquainted with this in the now discontinued range of Sony Vaios.

Apologies for simply posting a link but anyone with a Dell laptop might be well advised to look into this. It's a pretty involved issue and typically the computer manufacturers' tech support are unhelpful. Unsurprisingly they want to tie consumers to their expensive replacement parts.

http://nctritech.wordpress.com/2010...-ac-adapterschargers-hardware-vendor-lock-in/
Click to expand...
bazz2004 said:
In the case of laptop batteries it's worth considering a possible complication where the computer manufacturer has taken steps to make it very tricky to install a cheaper replacement unit from a third party supplier. I haven't much experience with laptops but am acquainted with this in the now discontinued range of Sony Vaios.

Apologies for simply posting a link but anyone with a Dell laptop might be well advised to look into this. It's a pretty involved issue and typically the computer manufacturers' tech support are unhelpful. Unsurprisingly they want to tie consumers to their expensive replacement parts.

http://nctritech.wordpress.com/2010...-ac-adapterschargers-hardware-vendor-lock-in/
Click to expand...
It seems that there are problems with Dell laptop batteries. I wonder if anyone has had problems with Acer batteries as this is the second new battery that won't charge yet my old battery will?
 
Quality control on batteries is not the greatest. Even with the major manufacturers’ own batteries there have been issues. I believe that the last lineup of Sony Vaio laptops sold earlier this year have issues with their batteries.

If a laptop keeps turning itself off it is more likely to be a motherboard issue. Unfortunately taking a laptop apart and fixing it is a difficult and time consuming business.
 
bazz2004 said:
Quality control on batteries is not the greatest. Even with the major manufacturers’ own batteries there have been issues. I believe that the last lineup of Sony Vaio laptops sold earlier this year have issues with their batteries.

If a laptop keeps turning itself off it is more likely to be a motherboard issue. Unfortunately taking a laptop apart and fixing it is a difficult and time consuming business.
Click to expand...


OK worse case scenario new motherboard. I might as well upgrade rather than just replace - any suggestions please (not too expensive). Is it easy to replace? I've done a desktop before but not a laptop.
Thanks
 
You can't upgrade laptop motherboards like you can do with replacing desktop motherboards. Laptop motherboards are replaceable but it takes more skill because the laptop has to be entirely torn down...
 
I suppose I could live with just using the battery power as it works OK if I could just charge up a new battery but I seem to be able to only charge up my old one which only lasting about 30 mins max. Could this be to do with the motherboard?
 
Unless you can pinpoint the problem to battery/charger I'd say cut your losses. You haven't said whether the new batteries are Acer branded or third party units. That is relevant because you reckon the original battery works even though it's at the end of its life. Battery suppliers will sometimes give a refund.

A replacement motherboard is going to be expensive and as a DIY project it will take you an awful long time. I'd rather put the money towards a new laptop or tablet. Fixing a laptop is nothing like working on a desktop.
 
Laptop motherboards can cost as little as $85 up to around $130 as long as you don't buy replacements from the original manufacturer. EBay is a great source for laptop parts including Dell parts. Most laptop repairs including motherboard take less than 1 hour. Windows Updating takes about 6!
 
Saggie80 said:
The problem is that I can't seem to charge up a replacement battery I have already returned one and on my second replacement that also won't charge. What if I replace the m/b and the battery still won't charge?!
Click to expand...
Replacing the motherboard will solve the battery charging issue. You have already eliminated the AC Charger, and battery itself
 
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