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Laptop makes buzzing noise on battery

Posted on 2010-09-18
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Last Modified: 2013-12-09
Panasonic Toughbook CF-51 laptop.  The unit works well, however when running off the battery it makes a loud humming sound.  Any suggestions for how to reduce/eliminate this noise? Thank you!
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Question by:Karalynn1958
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Expert Comment

by:Brad Howe
ID: 33710100
Stop you laptop. Remove the Battery and place it back in. Ensure that it is secured tight and all the contact are in place.
Check you power settings in the control panel and see if any settings are causing the cpu fans to run.
-Hades666
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Author Comment

by:Karalynn1958
ID: 33710166
I had already removed and replaced the laptop, had also tried another battery from a different CF-51, have cleaned the battery contacts with rubbing alcohol and have tried my power settings both on laptop and on max battery.
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Expert Comment

by:nobus
ID: 33710455
a  humming sound comes from the battery?   strange, since it supplies only DC.
are you sure it does not come from the AC adapter?
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Author Comment

by:Karalynn1958
ID: 33710789
It only happens when the AC adapter is unplugged.  
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Expert Comment

by:nobus
ID: 33710958
are there any vibrations?
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by:nobus
ID: 33710960
..good, good, good vibrations...
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Expert Comment

by:asidu
ID: 33713959
>>It only happens when the AC adapter is unplugged<<
Inspect the DC jack contact.
Could it be due to a loose DC jack contact?

Noise probably coming from fan as suggested earlier by Hades666.

You have to open the machine and have a look at the mother board.
If the sound coming from a component it will be difficult to pinpoint.
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Author Comment

by:Karalynn1958
ID: 33776024
It ended up being an installation issue.  With a clean installation of windows the problem vanished.  I still don't really understand the source of the problem, but am happy to have it resolved.
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Expert Comment

by:nobus
ID: 33776223
then close this Q please...
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Author Comment

by:Karalynn1958
ID: 34117140
Where should I write to get instructions on how to properly close my own question?  Srry, Kara
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by:nobus
ID: 34118509
in the help files - asking/closing Q
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