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elrd5150
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Posts: 4
Registered: ‎10-09-2019
Location: US
Views: 96
Message 1 of 6

Problem with fan after BIOS update on brand new S340

Hi.

 

I have a problem with my brand new S340-14API.

Apparently, it started after updating the BIOS.

If the temperature of the SSD rises above 41 degrees, the fan turns on.

 
elrd5150
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Registered: ‎10-09-2019
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Message 2 of 6

Re: Problem with fan after BIOS update on brand new S340

I did couple more tests and find that this issue not only due to SSD alone.

I turned off the computer for several hours so that the case could cool.

After that I launched Blackmagic Disk Test and after a while it raised SSD temperature of 65C.

BUT. Fan did not start spinning.

 

On the other hand, when I do something completely ordinary, like watch a video on YouTube, even one degree above 41C starts the fan.

 

Shouldn't the fan spin only to cool the CPU? Because even if I stop doing anything it spins for about 10 minutes and just throws out cold air.

 

Haven’t used laptops for years, so confused as hell right now.

 

Any insight is widely appreciated.

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Benji96
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Registered: ‎06-19-2019
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Message 3 of 6

Re: Problem with fan after BIOS update on brand new S340

I presume the CPU needs cooling because that also gets warm even when rendering 4K videos for example. You are right though about the fan not spinning due to the SSD temperature. After all, the SoC has the chipset and all in the computer in one spot and thus the SoC is not only the CPU part that needs cooling, also the GPU. And that gets quite active during watching videos, that's why the fan ramps up.

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Lenovo Yoga 530-14ARR (81H9003VGE)
elrd5150
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Message 4 of 6

Re: Problem with fan after BIOS update on brand new S340

Well, I have integrated GPU.  If it gets hot it should be read by CPU temperature sensor, right?

The fan also starts when I download something for a while.

Here inside picture from video with a similar laptop (plus marked in red where is my SSD).

The fan is literally connected only to CPU. 

So I don't understand why it turns on when CPU is not hot at all.

inside.jpg

Benji96
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Message 5 of 6

Re: Problem with fan after BIOS update on brand new S340

Yes, when the GPU works the CPU sensor picks it up. And in your screenshot it got up to 80°C, which is quite hot. That is the reason for the ramping up, not the SSD. My SSD also doesn't cause the fan to spin up (on a Yoga 530). 

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Lenovo Yoga 530-14ARR (81H9003VGE)
elrd5150
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Message 6 of 6

Re: Problem with fan after BIOS update on brand new S340

Sorry, shouldn't have cut the labels on top of pictures.

80C This is the maximum temperature that I had when run CPU stress test.

It's not current value and not related to temperatures during normal use.

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