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143 Posts

11-15-2009

Stockholm

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Re: T420s Fan noise Issue

2011-09-04, 14:08 PM

It's now fall in Stockholm so the ambient temperature has been slightly lower than in the last few weeks... and guess what, in these conditions, the fan behaves properly.  CPU warms up to 44+ Celsius and the fan jumps to 3500 RPM.  Cool it down a few Celsius and the fan drops back to below 2000.  And it will do this repeatedly day in and day out.

 

That's probably why the engineers couldn't duplicate this problem in the lab where the temperature is probably a cozy 20-22 degrees.  Those of you who predicted that the fan complaints would start to go away as the days get shorter and cooler were 100% right.

 

Hope that the engineers can release a test BIOS soon for those of us who still have ambient temperatures above 27 C indoors...

 

 

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207 Posts

08-28-2008

Israel

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Re: T420s Fan noise Issue

2011-09-04, 14:29 PM

wrote:

It's now fall in Stockholm so the ambient temperature has been slightly lower than in the last few weeks... and guess what, in these conditions, the fan behaves properly.  CPU warms up to 44+ Celsius and the fan jumps to 3500 RPM.  Cool it down a few Celsius and the fan drops back to below 2000.  And it will do this repeatedly day in and day out.

 

That's probably why the engineers couldn't duplicate this problem in the lab where the temperature is probably a cozy 20-22 degrees.  Those of you who predicted that the fan complaints would start to go away as the days get shorter and cooler were 100% right.

 

Hope that the engineers can release a test BIOS soon for those of us who still have ambient temperatures above 27 C indoors...

 

 


I live in Israel, it is hot here most of the year.

When the Air Condition in on and the room temperature are 27C and lower, the fan sometimes goes to 2000RPM when the CPU temperature is under 40-43C.

When the room temperature is over 27C, the fan is constant on 4000RPM, regardless of the CPU temperature.

___________________________________________________________
Lenovo Thinkpad T420s
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62 Posts

05-26-2011

Switzerland

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Re: T420s Fan noise Issue

2011-09-04, 20:38 PM

Guys, please stop talking about the weather, we're not at a tea party here. 

 

As I said earlier, the videos I did and showed to you were all made by an ambient temperature of 24° C. That's far away the 27° C you're talking about. 

 

There's a misinterpretation from the fan controller, temperature sensor or what ever that causes the fan to spin fast even when it's not necessary.

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9 Posts

09-04-2011

Denmark

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Re: T420s Fan noise Issue

2011-09-04, 23:46 PM

Hey everyone.

 

I have been following this thread for a couple of months now, and I too have a T420s with a noisy fan (3900-4000rpm constantly)

 

I read about the weather, and I just threw my T420s into my refrigirator a few minutes ago while I was brushing my teeths..

 

Before the CPU temp was 42 and fan was 4042.

 

When I took the pc out of the fridges, was 32 and and it is constantly 35 degres and fan speed is 980-1040. NO sounds this is perfect :)

Temp is flickering between 35-36 now...

 

So the fan controller is able to lower the my fan speed, even after it has reached 4000rpm.

 

No power cord is connected.

 

Bios 1.25, Power manager 3.62, "Long battery life" selected"

 

CPU just reached 38...

 

About my T420S

Itis the i7, optimus nvidea gfx and SSD.

 

Model 4174-P4G

Production date 11/05

 

This is ofcourse not an acceptable solution, to stick the computer in the fridge... But I just wanted to tell that the bios is able to control the fan speed, and also lower it once it has reached 4000rpm.

CPU temp just reached 39.

 

So I will just wait to post this message, until CPU has reached 40...

CPU now 40 and speed is 2000rpm...

CPU dropped to 38 and speed remaining on 2000rpm

 

All meatured with HWinfo64

Runing Windows 7 enterprise

 

Odd... I few minutes has passed and it is stille able to remain at 37-38 degress... Eventhou that before the fridges it had been running for a long time with higher temp and noisy fan...

 

Had to open a 3D test software to get the CPU to 45..

45 and all Hell broke lose... 4000 RPM (3772 to be exact)

 

CPU is 37 now, and fan remain at 3783...

 

so in order to lower the fan speed, the computer must be a cold place for the temp to drop...

So the fan controller is waiting for a much lower temp to lower the speed, than it uses to raise the fan speed.

 

Does this help a bit ? :)

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143 Posts

11-15-2009

Stockholm

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Re: T420s Fan noise Issue

2011-09-05, 5:38 AM

wrote:

Guys, please stop talking about the weather, we're not at a tea party here. 

 

As I said earlier, the videos I did and showed to you were all made by an ambient temperature of 24° C. That's far away the 27° C you're talking about. 

 

There's a misinterpretation from the fan controller, temperature sensor or what ever that causes the fan to spin fast even when it's not necessary.


Dan0:

 

No, we're not at a tea party. But like it or not, ambient temperature DOES have impact a computer's ability to cool things down.  I am not disagreeing with you that there is a problem with the fan controllers and the temperature sensors - I'm just saying that ambient temperature exacerbates the problem! 

 

For example, let's say the air intake area is located right above a temperature sensor.  If the air that's being pulled in is WARM, the temperature sensor will think that the component is warm and will want to cool it down.  But maybe the component itself is nice and cool, but it's the outside air that is causing the component and its temperature sensor to report incorrect readings.

 

 

 

 

 

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3538 Posts

07-12-2010

Malaysia

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Re: T420s Fan noise Issue

2011-09-05, 8:15 AM

 

> What I am able to view on this issue is that there are several types of sensor from different manufacture

 

... So there are different types of sensors but only one type of fan? Someone was suggesting earlier that there were different types of fans too (thanks to a factory having a problem after the tsunami).



 

 

What should be the CPU temperatures at what fan speeds? Could you provide us with a table?

 


There are different manufacturers laptop parts however the tsunami that hit Japan did not cause Lenovo to change its fan suppliers. (I checked with the product owners)

 

I am not sure how the BIOS works internally however engineering explained that its due to the fan control thus causing fan to rev at high speed, am anxious for the team to release it and everyone can return to their daily task :)

 

//JameZ

 

//JameZ

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163 Posts

07-02-2011

USA

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Re: T420s Fan noise Issue

2011-09-05, 12:56 PM

bigbirddk:


Be very careful when performing this kind of "refridgerator" experiment. Exposing your laptop to extreme temperature changes (like putting it in the refridgerator) can cause condensation to form on internal components, which can cause quite a lot of damage.

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1 Posts

09-05-2011

UK

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Re: T420s Fan noise Issue

2011-09-05, 15:11 PM

I agree with jmstuckman. Putting it in the refridgerator is rather extreme. How about using a cooler fan to cool it. I know it is not a permanent fix but will do the job while you are using it. I have a similar problem with noise when overheated with constant use so I use a cooler fan.

 

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1 Posts

09-05-2011

London

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Re: T420s Fan noise Issue

2011-09-05, 16:16 PM
Regarding putting it the fridge - I was shocked by your ingenuity! But I'm a great believer in low-tech solutions in the right circumstances.
qrops and
qnups
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30 Posts

05-31-2011

Switzerland

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Re: T420s Fan noise Issue

2011-09-06, 19:00 PM

Sorry, the whine above 2000 rpm the whine comes from the fan, so finally I aks Lenovo to change my fan.

 

@ jamez please give me instructions how to get a service from lenovo in order they

change my fan to an updated unit which does not whines aboe 2000 rpm.

 

thanks

 

lenofixIT

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