T420s Fan noise Issue

[LinYu]

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pleon wrote:
Well, i just did it in Device manager, open properties of that Lenovo device and on Driver Tab there is a possibility to uninstall. In dialog box check the checkbox to physically delete the driver from the disk. Thats all.

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Looks good, but please be patient and explain this to me:

1 - How is that Lenovo device called in your system? Aren't you referring to your system's thermal unit? I don't seem to find in the Device Manager anything that even remotely appears to be related to it.

 
2 - So you uninstalled the driver, and then what happens? Are you experiencing any issues, at all? Does everything seem to be working fine? Does the fan still work?...

Thanks for your help.

[pleon]

Well, i just removed device form Monitor part in Device Manager, you shoud have Lenovo Monitor device. And after that, fan started to work properly, reducing RPM based on temperature. Simple.

[LinYu]

So you have no monitor driver and no problems now... Amazing. 

[sunan126]

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pleon wrote:
Well, i just did it in Device manager, open properties of that Lenovo device and on Driver Tab there is a possibility to uninstall. In dialog box check the checkbox to physically delete the driver from the disk. Thats all.

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Thanks. I'll take a try. If everything goes fine, I'll report it here.

[alvoha]

@Mark_Lenovo Hey Mark! We're still waiting for an update!

2 months ago I tweeted a question to the official @lenovo twitter account, asking if you were ever going to fix this issue. The @lenovoforums account (which I understand you, Mark, is in charge of?) answered "we've addressed many of the cases through BIOS update. Still some remain. Need a sample that isn't .... 

So my question is: Why the heck aren't you cooperating with all the people in this thread who're having problems???

Anyway here's an interesting observation I made yesterday. I met another guy with a t420s that didn't make that annoying high pitched noise, but more like a deep humming, even though his machine was also spinning away at 4000RPM. I'm fine with the fan spinning at 4K if it's just not making that annoying whiny noise. Could it be that some of the fans are just more noisy that others? And the sound problem could be solved by replacing the fan? Has anyone had success replacing the fan?

And another question.

On this page there's listed two different part numbers for the fan part (and another two numbers for optimus fans). What is the difference? One is labeled 'not to be replaced by user' and the other is not?

[lead_org Microsoft MVP Contributor]

Lenovo usually uses two companies for the fan.

In the past Fukuwara and Toshiba are the major manufacturer for ThinkPad laptop fan. But nowadays, Panasonic fans are also used.

So check which fan you have, i think there should be a sticker on the fan itself, and check which fan that the other person has. You can reach the fan by taking off the keyboard.

[calkenneth]

For what it's worth, my first T420s used an AVC BATA0507R5U fan. When they replaced the fan, it was also an AVC.

[Helvetia]

@ LinYu & pleon: Thank you for the hint.

Unfortunately there is no improvement of the high spinning fan behaviour after uninstalling the display driver.

[pleon]

Well, strange, i made test on 2 T420s devices and it helped on both of them.

[marcinm]

Thanks,

Finally, my t420s (i5, 256ssd, 8gb) is quiet after uninstalling of "Lenovo - Display - ThinkPad Display 1600x900" driver. It was really annoying.

Marcin