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1 Posts

07-10-2015

Estonia

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Re: T420s Fan noise Issue

2015-07-10, 18:59 PM

I had the same problem. My fan ran at about 4000rpm always. On idle and on full load also. I actually fixed my problem by upgrading my BIOS to version 1.39. Now the fan sits at about 2000 rpm on idle and sometimes goes a bit up and keeps my temperatures on about 43C. I'm also running Ubuntu 15.04 and everything seems to be working ok.

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44 Posts

07-05-2015

Norway

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Re: T420s Fan noise Issue

2015-07-10, 20:10 PM
my fan were extremely noisy after 3 years.. Got a new one very cheap from hong kong (ebay) and followed Lenovos great repair manuals to replace it (recommended, its a lot of parts).. worked like a charm on mine :)
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23 Posts

12-17-2011

Germany

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  • Message 1213 of 1217

Betreff: T420s Fan noise Issue

2015-08-06, 11:47 AM

I'm actually quite happy since the installation of tpfancontrol 3,5 years ago. Nevertheless, there is this gap in fan levels between level 1 and level 3. Level 2 doesn't seem to be associated with a fanspeed.

 

Do you know of anyone who modded the EC to allow for a fanspeed between level 1 (~2000rpm) and level 3 (~3500rpm)? I guess 2500-2800rpm would still be quiet enough yet reduce temperature significantly.

 

Thank you for any hint!

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3 Posts

05-02-2017

United States of America

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Betreff: T420s Fan noise Issue

2017-05-02, 19:59 PM

I may have found the discrepancy between Lenovo's results in the lab, and users results, although people have to verify.

 

The Lenovo result is that the computer fan will downshift to about 2000 RPM after the computer is idle and has had enough time for the processor to cool. The users results are that the fan speed remains at 4000 RPM long after the computer has cooled.

 

Here is the sequence, and I use AC power, not battery :

 

1. Bring up Lenovo Power Manager, switch to Advanced menu, Select "Restore default settings," and click OK.

2. Reboot the computer.

3. Run your tests. I like to go to the home page nytimes.com and also I watch HWINFO64 output to see fan speed and some temperatures.

4. After system heats up and fan is running at 4000 RPM, close the browser.

5. Watch as CPU temperature comes down to 37C, and see if fan changes speed. Perhaps it will not. The goal is to find a situation where it does not work down to 2000 RPM. Only then proceed to step 6.

6. Bring up Power Manager, Advanced, and System settings.System Performance. Change System Performance from Maximum turbo to Turbo, and click OK.

7. Reboot the system.

8. Go back to step 3. If all goes well, this time in step 5, you will now get the Lenovo test lab results, and the fan speed will decrease to 2000 RPM when the computer cools.

 

The hunch is that the computer needs to be rebooted after changing Power Manager settings for them to be reflected in fan behavior.

 

Burt

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3 Posts

05-02-2017

United States of America

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  • Message 1215 of 1217

Betreff: T420s Fan noise Issue

2017-05-06, 1:43 AM

I tried again and I had less reliable results. However, at one point I was able to get the fan to go down to 2000 RPM although I was in default "Energy Star" mode (I assume that means the green leaf shows up in Power Manager basic mode). When I say default, that means that I was in Maximum Turbo. I apologize for not taking careful notes, so my information is inexact. One time, despite the fact that I was in Turbo rather than Maximum Turbo, I was having trouble, I mean, the fan would not go down below 4000 RPM. This may have been the time, I am not certain, but one instance when the room temperature was 75F, I turned on my house air conditioning system, and as soon as I felt cold air blowing on me, the fan started winding down to 2000 RPM. HOWEVER, when I tried rebooting with the AC still running, I could not get the fan to go down to 2000 RPM; it was at 4000 RPM. I put the laptop right on top of my AC vent, and the Motherboard and/or Temp0 went down to 34C after a bit of time, but the fan stayed at 4000 RPM. Now, I had the idea of disabling the wireless connectivity via "Network Connections" in Windows 7. I rebooted, and I was in default Energy Star mode, and the fan worked down to 2000 RPM fairly quickly. Interestingly enough, the Lenovo lab report reads in part

 

"I used our THI fan / temperature logging tool. To run the CPU at full utilization, I used HeavyLoad. I started THI and the fan was at 1960rpm +/- 25rpm. CPU temperature was 35C; ambient temperature was 23C. I then ran HeavyLoad; CPU temps began to rise and as the temp passed through the 40s, the fan speed picked up. 4000rpm was reached when the temp was in the 60s; the CPU eventually stabilized at about 78C with the fan spinning at 4060rpm +/- 30rpm. I then stopped HeavyLoad. Temperatures began to fall, much slower than they rose. When the temp hit 35C, the fan speed dropped to 1960rpm +/- 25rpm. I then connected to the internet via wireless and brought up Internet Explorer and began browsing. CPU temps fluctuated in the low to mid 40s but the fan speed stayed around 2000rpm. "

 

so their good results occurred with no wireless internet connection, too. I imagine that the wireless device is still powered -- I did not disable it in the BIOS -- but perhaps with it disabled it is not transmitting and causing a possible hot spot.

 

I have a T400 (which behaves a billion times better) and HWINFO shows that there are 12 ACPI temperature sensors in the T400 versus 2 ACPI temperature sensors in the T420S. So one theory I have is that all the well behaved fan algorithms that folks had painstakenly worked out with many sensors, fall apart when the sensors are missing. Maybe the designers make up for the lack of temperature sensors by being extra cautious and running the fan at high speed much more often.

 

Well, the whole time I am writing, that fan is staying at about 1957 RPM. I think I'll take the laptop upstairs and try a wired internet connection and keeping the wireless disabled.

 

Burt

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1 Posts

05-17-2017

Israel

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  • Message 1216 of 1217

Re: T420s Fan noise Issue

2017-05-17, 18:29 PM

Help  please!

I  have   a  fan error  on  boot after installing   a new  fan. Had  no error  before  just terrible noise.

While  powering  on,  the  fan  turns on  and  blows  smoothly.

The   computer  beeps twice and  giving  "fan error." and   ashuts off

 pressing  blue  button didnt  help

"esc" neither

 

can't enter bios

 

iseas?

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3 Posts

05-02-2017

United States of America

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  • Message 1217 of 1217

Re: T420s Fan noise Issue

2017-05-17, 20:42 PM

That is terrible news. My guess is that the 3rd wire, the tachometer, either is not making contact, or less likely, the fan tachometer is broken. I wish I had some tricks for testing -- if there is any way to run the computer even when it is pulled apart so the fan connector is accessible -- then you could compare the 2 fans, and maybe it is just a dirty connector. I assume the new fan is one of the ones recommended. Good luck. I have a new fan waiting for me to get in the mood to install it. BTW, I have had the best luck with models W530 and T400, they are great, and less luck with the T410 which runs the fan too often, and less luck with T420S which runs the fan too often but even more annoying sound than the  T410.

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