IBM T41 Fan Speed

Posted on 2004-04-20
Last Modified: 2013-11-17
When the laptop is plugged in to the AC adaptor,  the fan speed is fairly high and noisy, even though the laptop CPU load is very low with nothing running.  Why won't the fan run a a slower speed, and what adjustments can be made?

Question by:jseverson
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Accepted Solution

matalyn1016 earned 500 total points
ID: 10875105
Unfortunately you cannot adjust the CPU fan speed of the IBM T41.

I think the difference you are hearing is the laptop running with modified power settings while on its battery and full power when plugged into the AC adapter, typically the fan will run at a higher RPM at full power.

Best Practice is to replace the fan while its making noise rather than replacing the CPU when the noise stops.

This link should help with the replacement parts and the fan should cost you around $65.00. Fare labor is about 2 hours.

Hope this helps

Author Comment

ID: 10875121
OK, but when the laptop is plugged into AC, should its speed depend on the load on the CPU?   Or does it just run at one speed?

Author Comment

ID: 10875144
Look what I found on the IBM website:

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TP General - Symptoms corrected by updates to Battery MaxiMiser and Power Management Features for Windows
Summary of changes
Symptom corrected by version 1.30

(New) Package structure has been re-organized.
Symptom corrected by version 1.30a

(Fix) Some CPU speed settings do not work correctly on Microsoft Windows XP.
Symptom corrected by version 1.30b

(Fix) Battery MaxiMiser Wizard may cause an error when saving a new extended power scheme.
Symptoms corrected by version 1.31

(New) Support for uninstallation of all modules.
(New) Removed unnecessary driver installation.
(New) Changed default installation folder name.
(New) Current tray icon's status is kept in overwrite installation.
(New) Battery MaxiMiser Wizard supports Lid close action beep setting.
(Fix) BMMTASK.EXE may prevent power management timer settings on Microsoft Windows 98 by enabling task scheduler even in unnecessary cases.
Symptoms corrected by version 1.32

(New) Support for the Password Beep setting for T40, T40p, X31, and onwards.
(New) Support for new internal interface for Presentation Director.
(Fix) Uninstallation may not complete correctly while some modules are running.
(Fix) Global battery settings may not work correctly.
Symptoms corrected by version 1.33

(New) Support for maximum fan speed control for ThinkPad G40.
(Fix) LCD brightness setting changed using hot key will be lost by changing power source, when a Battery MaxiMiser power scheme is selected.
Symptom corrected by version 1.33a

(Fix) Screen blinks periodically when Battery MaxiMiser Gauge is on the system tray.
Symptom corrected by version 1.33b

(Fix) CPU speed setting for AC of some Battery MaxiMiser preset schemes is not correct.
Symptoms corrected by version 1.34

(New) Support for Remove and Replace Battery menu in Battery MaxiMiser Gauge.
(New) Battery MaxiMiser no longer supports CD Audio, DVD Movie, Word Processing/E-mail, Dark room, and On Screen Presentation preset schemes.
(New) Battery MaxiMiser does not support CPU speed settings on Windows XP on condition that the setting will not take effect.
Symptom corrected by version 1.35

(Fix) LCD brightness of Battery MaxiMiser Power Scheme will not change when AC adapter is plugged-in, if OS starts without an AC adapter.
Symptoms corrected by version 1.36a

(Fix) Improved Battery Health function does not work correctly when replacing batteries dynamically.
(Fix) Improved Battery Health autonomic function does not work correctly for the second battery.
Affected configurations
Any of the following IBM ThinkPad systems:

570, 570E

600, 600E, 600X

770, 770E, 770ED, 770X, 770Z

A20m, A20p, A21e, A21m, A21p, A22e, A22m, A22p

A30, A30p, A31, A31p(*1)


R32(*1), R40(*4), R40e(*6), R50(*5), R50/p(*5)

T20, T21, T22, T23
T30(*3), T40(*4), T40p(*5), T41(*4), T41p(*5)

X20, X21, X22, X23, X24

X30(*4), X31(*4)

i Series 1157(*1)

*1 Supports Windows 98/Me/NT 4.0/2000/XP only

*2 Supports Windows 98/Me/2000/XP only

*3 Supports Windows 98/Me/NT 4.0/2000/XP only
Only the following T30 models support the Windows Me: 2366/2367-x1x, x2x, x3x, x4x, x5x, A6x and A7x except for M1x, M2x, M3x, M4x and M5x

*4 Supports Windows 98/NT 4.0/2000/XP only

*5 Supports Windows 2000/XP only

*6 Supports Windows Windows XP only

*7 Supports Windows 98SE/2000/XP only

*8 No Windows XP support
*9 Supports Windows NT 4.0/2000/XP only.
Click here to download the latest Battery MaxiMiser and Power Management Features for Microsoft Windows 95/98/Me/NT4.0/2000/XP.
  Applicable countries and regions
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Document id:  MIGR-51268  
Last modified:  2004-02-19
Copyright © 2004 IBM Corporation
   Document information
 Product categories:
  PC Servers, Desktops, Mobiles and PC Options (Intel Based)
  Mobiles - ThinkPad, WorkPad
  ThinkPad 570 Series
  ThinkPad 570E
 Operating system(s):
  Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP  
 Version: or 5.03.04  
 Reference #:
 IBM Group:
  PSG Support and Services
 Modified date:

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Expert Comment

ID: 10875279
The load of the CPU does not dictate the fan speed. Fan speed it usually on or off and regulated by the heat of the CPU. I agree it has been noted that this model has some problems but none of the fixes address the fan – primarily it is CPU speed related.

An excerpt from another forum

Best of Luck!!!

Author Comment

ID: 10910358
You are correct.  

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