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Nexon
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Posts: 55
Registered: ‎08-28-2019
Location: CZ
Views: 441
Message 211 of 245

Re: Lenovo Y540 crackling sound

And does it change anything? I don't really understand what it does but from what I understood it has something to do electricity and fan ramp?
Nexon
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Posts: 55
Registered: ‎08-28-2019
Location: CZ
Views: 440
Message 212 of 245

Re: Lenovo Y540 crackling sound

That feature is there since WW21 bios so I doubt it was some reaction to this issue form lenovo...

Rajeshrs83
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Posts: 4
Registered: ‎09-07-2019
Location: IN
Views: 407
Message 213 of 245

Re: Lenovo Y540 crackling sound

Hi Cedric,
Neither did we (me and the service engineer) understood how it got resolved. From the recollection of things that he did on the 3.5mm jack inputs, I felt, it could be a bad contact with the wires on the 3.5mm jack. So i felt that it could be worth trying before going into other remedies like mother board replacement, windows clean install etc.

Thanks
Rajesh
berniwa
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Posts: 2
Registered: ‎10-13-2019
Location: AT
Views: 380
Message 214 of 245

Re: Lenovo Y540 crackling sound

It is actually my day job, to solve similar problems to this one. 

The noise issue is most likely caused, by electrical interference. It is similar to the sound you notice, if you place your phone next to a speaker and receive a text message (it will be audible in the speaker). 

With the CPU it's a similar thing, the CPU enable and disable power saving and you hear that in the speaker. 

I could image, that while reassembling  the Laptop, the service tech, didnt place cables exactely where they were therefore just slightly increasing the distance between certain parts of the circuit. This may have been enough to fix the issue. 

 

So basically two different approaches:

a) Make sure the CPU doesn't generate the noises, via BIOS update

b) Make soure the sound assembly is isollated well enough from the noise

 

Greets

Berni

Rajeshrs83
Fanfold Paper
Posts: 4
Registered: ‎09-07-2019
Location: IN
Views: 368
Message 215 of 245

Re: Lenovo Y540 crackling sound

Hi Berniwa,
On the dot, you have described the issue perfect. Yes, I agree with your thoughts

Thanks
Rajesh
zyzzyva
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Posts: 16
Registered: ‎08-19-2019
Location: TH
Views: 355
Message 216 of 245

Re: Lenovo Y540 crackling sound

5 days since BIOS fix and the noise is reduced significantly, though I'll continue to observe the situation.

Also about 3.5mm jack, you should make sure that the noise problem is not reproducable via laptop speaker, if even laptop speaker produce noise, then I don't think checking audio jack will solve the problem.

Rajeshrs83
Fanfold Paper
Posts: 4
Registered: ‎09-07-2019
Location: IN
Views: 348
Message 217 of 245

Re: Lenovo Y540 crackling sound

Correct, in my case it was only while using the headphones and the not via laptop speaker
Nexon
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Posts: 55
Registered: ‎08-28-2019
Location: CZ
Views: 332
Message 218 of 245

Re: Lenovo Y540 crackling sound

So it does not disappear completely? Wonder if it works when applied in older Bios as well.

dylancl
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Posts: 42
Registered: ‎09-05-2019
Location: BE
Views: 279
Message 219 of 245

Re: Lenovo Y540 crackling sound

Statements like these make me wonder where you actually get your information from...

 

Read the changelog for BIOS update 32WW found here: https://pcsupport.lenovo.com/us/en/products/laptops-and-netbooks/legion-series/legion-y540-15irh/dow...

 

Version BHCN32WW

 

BIOS Notification:

 

[Add] : Add the option "Slow Slew Rate for IA Domain" in bios setup menu

 

[Modified] : None

 

[Fixed]: None

 

EC Notification:

 

[Fixed] : None

 

[Modified] : Backlight will not off while S3/S4/restart if the brightness drops to the darkest level.

 

[Add] : None

 

 

Nexon
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Posts: 55
Registered: ‎08-28-2019
Location: CZ
Views: 243
Message 220 of 245

Re: Lenovo Y540 crackling sound

How do you explain I have that option there as well running on 26WW?

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