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10 Posts

12-02-2019

AU

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Re: Yoga C940 4k - Fan runs constantly

2019-12-25, 5:14 AM

That is exactly what I do.  I have that luxury as this was not purchased as a 9-5 business laptop, I wouldn't have bought one of these for that purpose.   In my case different criteria apply for business use - such as screen real estate, SSD redundancy, more ports, and battery life, while a UHD touch screen convertable is not necessary.

 

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16 Posts

12-19-2019

PL

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Re: Yoga C940 4k - Fan runs constantly

2019-12-25, 12:05 PM

In my case undervolting it even with -40mV leads to almost instant freeze... I'm not sure if there is any point in adjusting that if it's that unstable. 

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21 Posts

12-24-2018

US

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Re: Yoga C940 4k - Fan runs constantly

2019-12-25, 14:06 PM

It seems to be that only some people have the high pitch annoying fan sound and some people don't (50-50). I have it for sure, and Unfortunately i left the country after buying the laptop so i can't return it, will try to send it for repair when i go back.
I am undervolted as well at -60mv, but even at low rpms the high pitch of the fan is audible and annoying to me (unlike my prior yoga 920 which is barely audible even at full speeds).

It was so bad that last night when i went to bed i was still hearing the ringing in my ear/buzzing even if the laptop was on the room next door. It's just a very piercing high pitch noise.

 


 wrote:
if the fans bother anyone really just undervolt. Absolute 0% fans heard while undervolted at -57 mv and perfectly stable even for gaming.

 

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21 Posts

12-24-2018

US

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Re: Yoga C940 4k - Fan runs constantly

2019-12-25, 17:24 PM

Guys i am attaching a video of my laptop, you can hear the high pitch noise only if you wear headphones (it is much more audible in person).
Can someone tell me if this is the same noise your c940 makes? Like a jet engine. I want to understand if my laptop is defective or not. This sound penetrates my skull and i am super annoyed.  In comparison. My 920 sounds way lower pitch in comparison and i can barely hear it even at full speed.

https://photos.google.com/photo/AF1QipPy8A50hFvlQAJCdt5mKBCyMy7vQWK8bXigbkjY

 

 


 wrote:

It seems to be that only some people have the high pitch annoying fan sound and some people don't (50-50). I have it for sure, and Unfortunately i left the country after buying the laptop so i can't return it, will try to send it for repair when i go back.
I am undervolted as well at -60mv, but even at low rpms the high pitch of the fan is audible and annoying to me (unlike my prior yoga 920 which is barely audible even at full speeds).

It was so bad that last night when i went to bed i was still hearing the ringing in my ear/buzzing even if the laptop was on the room next door. It's just a very piercing high pitch noise.

 


 wrote:
if the fans bother anyone really just undervolt. Absolute 0% fans heard while undervolted at -57 mv and perfectly stable even for gaming.

 




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16 Posts

12-19-2019

PL

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Re: Yoga C940 4k - Fan runs constantly

2019-12-25, 17:36 PM

 wrote:

Guys i am attaching a video of my laptop, you can hear the high pitch noise only if you wear headphones (it is much more audible in person).


 

I attach my recording, it sounds similar. I sent it to polish support to ask if they are aware of the issue, waiting for response. I still hope that it will be possible to replace fan with a quieter one (I think that only one of them makes that whiny noise). Yet it's hard to use C940 in a quiet room. 

 

https://drive.google.com/file/d/1tFl7gNwdKJOh1Z3W007xJgIrPa8BTnEB/view?usp=sharing

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21 Posts

12-24-2018

US

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Re: Yoga C940 4k - Fan runs constantly

2019-12-25, 18:26 PM

@whateveer

If they reply (wether it's possible or not) to change the fan let me know.
Your fan sounds exactly like mine. What surprises me is that several people report not hearing anything. I don't know if they are deaf or this issue is only on some computers.
And yes, only one of the fans makes this whiny noise, the one near the pen garage. The other one is quite silent.

 


I attach my recording, it sounds similar. I sent it to polish support to ask if they are aware of the issue, waiting for response. I still hope that it will be possible to replace fan with a quieter one (I think that only one of them makes that whiny noise). Yet it's hard to use C940 in a quiet room. 

 

https://drive.google.com/file/d/1tFl7gNwdKJOh1Z3W007xJgIrPa8BTnEB/view?usp=sharing


 

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3 Posts

12-25-2019

US

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  • Message 67 of 143

Re: Yoga C940 4k - Fan runs constantly

2019-12-25, 19:32 PM

Hello all.... I am surprised to see this many posts on this. I wish I saw this before I bought this at Best Buy yesterday. Fa noise is annoying and i am not doing much except composing this no othet programs running. The noise comes and goes very badly. I was thinking it's because mine is 12GB RAM and I should have went with 16GB RAM :-( Please let me know if any issue to fix this. If not I have to return this laptop. Except fan noise this is a very good laptop for normal browing, office tools, netflix etc.,

 

Any help appreciated. 

 

My model listed below:

Lenovo - Yoga C940 2-in-1 14" Touch-Screen Laptop - Intel Core i7 - 12GB Memory - 512GB Solid State Drive - Iron Gray

 

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144 Posts

12-08-2019

US

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Re: Yoga C940 4k - Fan runs constantly

2019-12-25, 20:12 PM
Quick and easy solution is undervolt with Throttlestop...give it a try starting at -55 mv

https://www.maketecheasier.com/reduce-cpu-temperature-undervolting/
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18 Posts

07-28-2019

BE

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Re: Yoga C940 4k - Fan runs constantly

2019-12-25, 20:38 PM

My C940 4K 16gb 1tb does not make this kind of noise. The fans do fire up regularly, but they are silent and defenately not high pitched. That noise that both of you posted would drive me crazy.

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3 Posts

12-25-2019

US

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  • Message 70 of 143

Re: Yoga C940 4k - Fan runs constantly

2019-12-25, 23:08 PM

Thanks, I will give a try.

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