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163 Posts

07-02-2011

USA

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  • Message 821 of 1217

Re: T420s Fan noise Issue

2012-01-17, 21:01 PM

wrote:

My fan have been spinning at 4000RPM for hours, and all I've had open is a PDF and a web browser in the background (CPU load is 0 - 1 %, nothing intensive going on in the browser). Curious as to whether the fan was stuck at 4000RPM regardless of temperature, I decided to try and put the laptop in my fridge (still running). After a few minutes it dropped to 2000RPM. Took the laptop out again and after another few minutes the fan jumped up to 3500RPM. And I'm guessing It'll soon go up to 4000RPM again. 

So the fan isn't stuck. The temperature just never drops low enough for the fans to spin down. I think this could be solved by raising the threshold, as it has already been sugested.

 

Computer is an i5 with Intel HD Graphics 3000 BIOS 1.31 running Linux 


alvoha, bluezone78, and others: I do not recommend that you put your laptop in a fridge or another cold place while it's running. Suddenly putting a hot object (like a laptop) in a cold area causes water condensation, which can damage electronic components.

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6 Posts

12-07-2011

Berlin / Germany

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  • Message 822 of 1217

Re: T420s Fan noise Issue

2012-01-17, 21:58 PM

wrote:


alvoha, bluezone78, and others: I do not recommend that you put your laptop in a fridge or another cold place while it's running. Suddenly putting a hot object (like a laptop) in a cold area causes water condensation, which can damage electronic components.


jmstuckman, you got that mixed up. It is the other way round: Cold surfaces in warm air (more absolute moisture) will cause condensation (when taking it out again). 

 

Of course you might get some tension from the sudden change of temperature. Fridge (8°C vs. 20°C) should be okay but I would not try the freezer. ;-)

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20 Posts

08-13-2011

Germany

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  • Message 823 of 1217

Re: T420s Fan noise Issue

2012-01-17, 22:12 PM

@ JameZ: There are still many users waiting for a fix...?

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2483 Posts

04-08-2011

United States of America

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  • Message 824 of 1217

Re: T420s Fan noise Issue

2012-01-18, 4:26 AM

wrote:

@ JameZ: There are still many users waiting for a fix...?


@I thought I read was no longer with Lenovo.

 

Has Lenovo identified a root cause for the fan problems?

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17 Posts

01-18-2012

United States of America

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  • Message 825 of 1217

Re: T420s Fan noise Issue

2012-01-18, 5:49 AM

After reading so many information, testing all the BIOS version and nearly all the power manager, finally I got to know, the only soft solution by Lenovo is to change the threshold of fan speed in the BIOS driver. Since there is a defect of the fan which the speed levels are only 2000, 3500, 4000, and more, a big lag between 2000 to 3500. They don't want to so cause if they do, the t420s will not be a coldest computer any more. So these guys would like to spin the fan faster.

 

The physical solution may need to change another brand CPU fan.

 

Now I am using TPFancontrol, Which is not I want to...

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162 Posts

06-16-2010

West Lafayette, IN, USA

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  • Message 826 of 1217

Re: T420s Fan noise Issue

2012-01-18, 9:20 AM

wrote:

wrote:

@ JameZ: There are still many users waiting for a fix...?


@I thought I read was no longer with Lenovo.

 

Has Lenovo identified a root cause for the fan problems?


Wait JameZ retired WHAT???!!  Well now if we have issues we're basically screwed...

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8 Posts

01-04-2012

USA

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  • Message 827 of 1217

Re: T420s Fan noise Issue

2012-01-18, 16:43 PM
Yesterday, Mark_Lenovo PM'ed me for my address to loan my laptop to engineering.

It's a 4170-CTO; i5 2520M + Intel graphics.

Hopefully we can get a fix.
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1337 Posts

12-20-2011

Malaysia

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  • Message 828 of 1217

Re: T420s Fan noise Issue

2012-01-18, 23:58 PM
Yeah ... JameZ is retired.

Guys, like I (JameZ) said ... the best way to fix this is to get a volunteer machine from the US to get a faulty laptop shipped in so engineering can do a RCA of the problem and from there find a fix.

I see jasona from the US has volunteered the laptop so now let's get the machine shipped in and let engineering look into it for a fix.

*Non Lenovo employee*

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28 Posts

01-18-2012

Texas-USA

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  • Message 829 of 1217

Re: T420s Fan noise Issue

2012-01-19, 0:13 AM

After following this thread for the last 6 months, I thought I would finally chime in. I have to take my hat off to all of you non-Lenovo folks trying to isolate the problem.

 

So for what it's worth, I noticed that my fan spins non-stop (high pitched like a dentist drill) while the PC is on and I am charging the battery. It will continue to do so even after the battery indicator reaches 100%.

 

However, if I am working while on battery power (not plugged in to a power outlet) the fan behavior is much more along the lines of a normal PC, in that the fan is only audible when I'm taxing the CPU with several applications.

 

Does anyone else have the same laptop behavior?

 

Hope this helps in some way. David

 

PS - I am not technical, use a T420s purchased in June, and do not have TPFan installed.

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22 Posts

10-26-2011

United States

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  • Message 830 of 1217

Re: T420s Fan noise Issue

2012-01-19, 0:19 AM

Hi everybody,

 

A BIG UPDATE for all of you.

 

I am based in the U.S and sent in my T20s a few weeks back. I have been having the issue of the fan intermittently getting stuck at 4000 rpm (as Jmstuckman has described quite accurately). To my dismay, I was contacted by Lenovo and told the following: "One of our level 2 Technician tested your system and found that the system after running the machine for about an hour and the fan is still at just below 2000rpm which is normal for an idle system. At idle, with an ambient temperature of 74 degrees, the CPU was at 88 degrees; that fan was just under 2000rpm. The machine sat like this for about an hour. Ran a program (Heavyload) to max out the CPU; temperature went to 178 and fan was just over 4000rpm. Stopped Heavyload and after about 4 minutes, CPU was at 104 degrees and the fan was just under 2000rpm  ( This is normal for this system ) "

 

This is incredibly frustrating. First of all, I never indicated in my problem description provided to them that there was an issue when the unit is simply sitting idle. The problem is sporadic and occurs after extensive usage (usually in hour 2 or so), with multiple internet windows open, perhapd my outlook, and ms word. The fan goes to 4000, and even after closing out all programs, continues to run. The engineering team only ran two tests that were clearly not thorough enough. They simply turned on my computer and let it sit for an hour idling, and tested the fan speed, which is of course not relavent the problem of getting stuck at 4000 rpmTheir second test of running heavy load very briefly (only 4 minutes) to get the fan to rev up and then closing out right away was also not thorough enough.

 

Bottom line, I got the computer back, and after using it for 2 hours (internet surfing, streaming news clips, and writing in MS word, the fan GOT STUCK AT 4000 RPM and refused to slow down even after I closed out all programs.

 

At this point, because the problem occurs intermittently and only under certain conditions, we (perhaps with JmStuckman's expert guidance), need to create a sure fire test method that will always produce the problem of being stuck at 4000 rpm. I can then insist they test my laptop again, and provide them with a very specific test to run that will result in the fan getting stuck (rather than their lazy quick tests that they ran).

 

Talk about frustrating- I even sent the link to this 7 month long thread to the engineers along with my laptop for their reference. Could all 500 of us be wrong in what we think is occuring with our laptop fans? Of course not, but clearly engineering is avoiding an all out thorough anaylsis of this very real problem. Probably something to do with cost issues and hardware flaws that are unfixable (fan sensor location is flawed, etc).

 

Please send your suggestions for a surefire test that will generate the fan problem and I'll be happy to send my laptop into team denial (aka Lenovo engineering team).


 


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