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ThinkPad NotebooksThinkPad: T400 / T500 and newer T series Laptops
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23 Posts

04-20-2011

norway

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Re: T420 Fan noise

2011-11-15, 10:36 AM
You can have my T420 if it's swapped for a new one. I don't want one back that's been opened. I would concider paying extra for a T420s if possible.
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11 Posts

07-27-2011

Germany

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Re: T420 Fan noise

2011-11-15, 11:16 AM

Hey JameZ,

for the next month I don't need my laptop.

Can you give me instructions how I should send in my laptop? (I'm from Germany)

 

Best Regards

lspcity

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2 Posts

11-15-2011

Austria

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  • Message 83 of 102

Re: T420 Fan noise

2011-11-15, 14:22 PM

Hi Guys!

I tested a lot of things and here is my summary:

 

Computer Details:

Lenovo T420

Type: 4236-NGG

Processor: Intel Core I7

Harddisk: 500GB SATA Drive with 7200rpm

RAM: 4GB

Operating System: Windows 7 64 BIT

 

Bios Version: 1.35

PowerManager: 3.64

 

Test1:

Only Operating System is loaded. No Program open and i do not work with the computer.

CPU Temperature: 40 - 42 degreed

FAN rpm: 1985 rpm

FAN noise: loud

 

Test2:

I start Internet Explorer 7 and start reading Newspaper on www.sport1.de

i do not really read the newspaper site, the site is only started and banners with commercial are running. Not more.

CPU Temperature: 45-48 degrees

FAN rpm: 3300 rpm

FAN noise: very loud

 

Is it possible that the grafik card is the problem?

 

@JameZ:

What should we do with this Notebook? I think the whole Notebook has a thermal Problem per design. In this cost level this should not be happen. I know there are a lot components like CPU, HDD and Grafik Card what produces a lot of "warm" air but anyway also other manufacturers use the same components and the notebook is much silent.

 

If you would like to have this notebook i talked to my customer and i can send it to you.

 

Please send me details how to to it in an private message.

 

Thanks in andvance.

 

Gerald

 

 

 

 

 

 

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3 Posts

11-13-2011

United States

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Re: T420 Fan noise

2011-11-15, 22:45 PM

downloaded bios 1.35. my fan noise wasn't even really bad from the start, i was just a little paranoid and installed it. i feel like its a little better though. 

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14 Posts

10-24-2011

Germany

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  • Message 85 of 102

Re: T420 Fan noise

2011-11-25, 21:07 PM

I updated to bios 1.36: the main problem ist still there. After longer time under high load the fan is stuck at ~3500 rpm (42°C). I have to add, that this only happens when I use the T420 in the docking station, respectivly on AC.

 

@ Jamez

 

I also would like to volunteer my T420, to get this problem finally fixed. 

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6 Posts

11-30-2011

United States

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  • Message 86 of 102

Re: T420 Fan noise

2011-12-18, 22:55 PM
Are there any updates on this issue? I'm located in the US and own a month-old t420 with BIOS 1.36 and a fan that runs constantly at around 1900 rpm at idle (45C or so).
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2430 Posts

04-08-2011

US

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Re: T420 Fan noise

2011-12-18, 23:04 PM

wrote:
Are there any updates on this issue? I'm located in the US and own a month-old t420 with BIOS 1.36 and a fan that runs constantly at around 1900 rpm at idle (45C or so).

What do you think is abnormal about that?  At 1900rpm it should be nearly silent and 45C is normal, too.

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6 Posts

11-30-2011

United States

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  • Message 88 of 102

Re: T420 Fan noise

2011-12-19, 4:32 AM
Hmm...I suppose I've grown accustomed to the settings on my t60 which didn't engage the fan at all unless it was under load. So does having the fan run at <2000rpm whenever the system is turned on (approx. 12-14hrs/day) more conducive to its longevity than having it spool up and *all the way* down at 5-10 minute intervals throughout the day?
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267 Posts

02-04-2008

Canada

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  • Message 89 of 102

Re: T420 Fan noise

2012-01-03, 18:14 PM

Is there any discernable pattern to problematic machines?

 

Is fan noise/excessive use restricted only to machines with dedicated graphics cards (NVidia) or both HD3000 and/or Nvidia GPUs??

 

I'm on the fence between getting a T420s or a T420...

 

X220 is completely out of the question due to the screen form factor (16:9) and resolution, there's absolutely not enough space for document processing which left me thinking about the T420(s).

 

But now reading through these forums and elsewhere about issues such as these described in this thread make me want to take my business elsewhere altogether.

 

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3509 Posts

07-12-2010

Malaysia

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Re: T420 Fan noise

2012-01-04, 3:56 AM
@All,

If the fan is running at 4,000 rpm all the time and despite system is idle and CPU core temp is below 50c to 40c then I think it should be looked at by engineering but if its running 1,900 rpm, I would consider that as normal fan speed? Also the noise would be also dependent on the environment.

If the fan is running at 1,900 rpm and you think that its loud, do get it checked to see if there are any dust or materials disturbing the fan. You can also try using a hand pump to clear the heat sinks area.

http://www.amazon.com/Squeeze-Duster-Hand-Pump-Blower/dp/B002Q68E3G

//JameZ
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