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Notebook self "unplug" when battery is full

post #1 of 8
6/2/12 at 2:24pm
Thread Starter 
Hello,
 
My laptop (Acer Aspire 5750G) shows "unplugged" and run on batteries when it gets fully charged, even though it is still plugged.
If I unplug it it plug it again, it shows "plugged in, charging" for a while, but when it reaches 100% it shows unplugged again...
 
This is apparently a software issue, since it recognizes it is plugged and charges the battery until it's full.
 
Another thing is that in the last days I updated the BIOS, opened the laptop to reapply the thermal paste, cleaning, etc... and put another small cooler (really small, 25mm) in the laptop to keep it from overheating (the CPU clock was dropping all the time because of it).
I don't think my maintenance could be any harmful though.
 
Anyone have any idea? I don't know what to do!
 
 
Laptop's specs (I don't think it's useful, but anyway)
 
Acer Aspire 5750G
 
Core i3 2310 2.1GHz
6GB DDR3 RAM
GT 540M 1GB
 
 
Thanks!
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post #2 of 8
6/2/12 at 2:31pm
Quote:
Originally Posted by vrgimael View Post

Hello,
 
My laptop (Acer Aspire 5750G) shows "unplugged" and run on batteries when it gets fully charged, even though it is still plugged.
If I unplug it it plug it again, it shows "plugged in, charging" for a while, but when it reaches 100% it shows unplugged again...
 
This is apparently a software issue, since it recognizes it is plugged and charges the battery until it's full.
 
Another thing is that in the last days I updated the BIOS, opened the laptop to reapply the thermal paste, cleaning, etc... and put another small cooler (really small, 25mm) in the laptop to keep it from overheating (the CPU clock was dropping all the time because of it).
I don't think my maintenance could be any harmful though.
 
Anyone have any idea? I don't know what to do!
 
 
Laptop's specs (I don't think it's useful, but anyway)
 
Acer Aspire 5750G
 
Core i3 2310 2.1GHz
6GB DDR3 RAM
GT 540M 1GB
 
 
Thanks!

This is an extra fan using power somewhere in the notebook? Cool. Got some pics for us?

If you remove this extra fan, would it be back to normal?

cheers ...
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post #3 of 8
6/3/12 at 9:16am
Thread Starter 

Yes, the fan is drawing power from the battery, since it is 11.1V and the fan is 12V, I thought it was a good place to use.

I used a transistor connected to the power LED to turn the fan on only when the laptop is on.

 

I don't think the cooler would have any impact on the battery, since the battery can support 48Wh and the fan only uses (12V * 0.05A)  0.6W

 

I didn't test it without the fan, cause it would be a pain to open everything again to disconnect the fan.. But as I said, I don't think it can be the fan.

 

I didn't take good pictures of it.. But here they are:

 

I also made a small hole in the fan side, to let the air escape.

The arrows going out of the fan are indicating the supposed air flow.

This is not my fan, but it looks like:

dc-cooling-fan-used-for-computer-and-household-appliances-697.jpg

As you can see, there's a small vent right under the fan. It's not big enough, but it's better than nothing..

IMG_2424.JPG

IMG_2409.JPG

 

Any ideas?

Thanks!

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post #4 of 8
6/3/12 at 10:40am
Quote:
Originally Posted by vrgimael View Post

Yes, the fan is drawing power from the battery, since it is 11.1V and the fan is 12V, I thought it was a good place to use.
I used a transistor connected to the power LED to turn the fan on only when the laptop is on.

I don't think the cooler would have any impact on the battery, since the battery can support 48Wh and the fan only uses (12V * 0.05A)  0.6W

I didn't test it without the fan, cause it would be a pain to open everything again to disconnect the fan.. But as I said, I don't think it can be the fan.

I didn't take good pictures of it.. But here they are:

I also made a small hole in the fan side, to let the air escape.
The arrows going out of the fan are indicating the supposed air flow.
This is not my fan, but it looks like:
350x350px-LL-02030e62_dc-cooling-fan-used-for-computer-and-household-appliances-697.jpeg
As you can see, there's a small vent right under the fan. It's not big enough, but it's better than nothing..
350x263px-LL-c108e582_IMG_2424.jpeg
350x263px-LL-e839dd63_IMG_2409.jpeg

Any ideas?
Thanks!

Tell you the truth the only way to be sure that it is not the extra fan is to remove it first. Cool set up, I usually bore some holes around the area of hard drive, wireless card and fan on the bottom case to pull in more air

cheers ...
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post #5 of 8
6/3/12 at 1:02pm
Thread Starter 

Hello, thanks for the reply.

 

Yeah, I just removed the fan and everything went back to normal..

I still don't know why, but I'm glad my laptop is fine.

 

Thanks again!

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post #6 of 8
6/3/12 at 1:07pm
Quote:
Originally Posted by vrgimael View Post

Hello, thanks for the reply.

Yeah, I just removed the fan and everything went back to normal..
I still don't know why, but I'm glad my laptop is fine.

Thanks again!

Maybe there is a conflict when spicing out the power from the battery area. Boring some holes is the next best thing or use better thermal paste.

cheers ...
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post #7 of 8
6/3/12 at 1:13pm
Thread Starter 

Yeah, maybe that's the problem.. I reapplied thermal paste and put some extra heatsinks as well.

Temperature is still high, but it isn't overheating.

I don't wanna make a lot of holes in the laptop cause that would make it unsellable if I want to sell in the future..

 

Is a cooling pad a good idea? Do they help a lot?

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post #8 of 8
6/3/12 at 1:17pm
Some of the cooling pads work. For me I can do without the extra noise of the pad cooling fan winknudge.gif Holes underneath the notebook won't make any differences in selling price, from what I experienced smile.gif

Or replacing the gummy foot with something thicker, just to elevate the notebook higher from the working surface, pulling more air passing through

cheers ...
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