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117 Posts

06-12-2009

Norway

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  • Message 761 of 1217

Re: re: T420s Fan noise Issue

2011-12-21, 22:56 PM

New BIOS in town, 1.31. Does not seem to fix anything for us. Getting tired of this noise. Any tips on other thinkpads that are light and noise-free or is it time to change brands?

 

CHANGES IN THIS RELEASE
  Version 1.31

[Important updates]
  Nothing.

[New functions or enhancements]
  Nothing.

[Problem fixes]
- Fixed an issue where the maximum number of password attempts through WMI was
  not 3.
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16 Posts

10-26-2011

Canada

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  • Message 762 of 1217

Re: re: T420s Fan noise Issue

2011-12-22, 1:49 AM

Did the update, and now it's stuckk @ 4000 RPM on my machine..

 

Didn't really have this problem before..

 

:smileymad:

 

Back to 1.29 or 1.30 it goes..

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49 Posts

08-10-2011

Germany

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  • Message 763 of 1217

Re: re: T420s Fan noise Issue

2011-12-22, 10:53 AM

so far it runs like 1.30.  let's see if it stays that way. 

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49 Posts

08-10-2011

Germany

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  • Message 764 of 1217

Re: re: T420s Fan noise Issue

2011-12-23, 15:39 PM

Back on 1.30 

with 1.31 the fan stuck at 4k much longer (from high load (~80°C) ) than with 1.30 . With 1.30 he drop down from 4k to 3.5 k at ~48-50°C with 1.31 I thakes much longer ~45°C or so. 

 

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143 Posts

11-15-2009

Stockholm

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  • Message 765 of 1217

Re: re: T420s Fan noise Issue

2011-12-25, 9:22 AM

wrote:

: Thanks for the answers, much appreciated :)

 

Let me just ask another one: do the different fan have the same FRU, or I would get the same one just because I have that one. In other words, what if I order a different fan, knowing that it is mounted on other T420s (and hence it is one of the right models for this laptop). Hope I was clear!

 

I know you are waiting for U.S. based people to volunteer, but if at some point other countries are considered I'll gladly send mine laptop in from Italy.

 

Cheers,

Alessandro



Look what I found, under sction #18.  http://support.lenovo.com/en_SG/product-and-parts/detail.page?&LegacyDocID=MIGR-77024

 

Turns out that there are different FRU numbers for different brands of fans.  Toshiba and AVC are your two brands, and each manufacturer makes one for the integrated graphics and one for the Optimus graphics.

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34 Posts

04-27-2011

San Francisco, CA

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  • Message 766 of 1217

Re: re: T420s Fan noise Issue

2011-12-26, 1:50 AM
Still same old problem under AC. Fan works for a while then, all of a sudden pegged at 4000RPM until a suspend resume cycle. Tried several clean installs, several bios resets to defaults, tried UEFI, Legacy installs. All result in the same behavior. Might have to start complaining for a refund since the promise of a fix was never delivered.
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7 Posts

06-28-2011

Seoul

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  • Message 767 of 1217

Re: re: T420s Fan noise Issue

2011-12-29, 5:30 AM

The fan from AVC can be the root cause of the problem.

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107 Posts

06-28-2011

Italia

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  • Message 768 of 1217

Re: re: T420s Fan noise Issue

2011-12-29, 23:38 PM

Can we run a small statistic on fan models that are mis-behaving or working as expected. Is there any way to obtain the model without opening up the laptop?

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162 Posts

06-16-2010

West Lafayette, IN, USA

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  • Message 769 of 1217

Re: re: T420s Fan noise Issue

2011-12-30, 3:03 AM

http://i429.photobucket.com/albums/qq20/Yangorang/ThinkPad%20T420s/CIMG0415.jpg

Well here's an image of my fan with FRU #04W0416 which is actually the Toshiba one and I find it's fairly whiny at 4Krpm - to take a look at the FRU ## you need only lift up the keyboard for a bit.


I haven't seen my fan get stuck at 4Krpm all that much recently - it seems to behave normally for the most part.

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2483 Posts

04-08-2011

United States of America

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  • Message 770 of 1217

Re: T420s Fan noise Issue

2011-12-30, 5:20 AM

Has any pattern emerged from this thread?  For instance are the T420s Optimus machines imune?  Or is some other combination imune?

 

Has Lenovo identified the problem?

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