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143 Posts

11-15-2009

Stockholm

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  • Message 11 of 38

Re: T420s coil/"CPU" whine recordings and request for service

2012-10-09, 18:49 PM
I just sent my laptop in for service for the same exact problem. I also linked to this site and your Soundcloud recordings as an indication of how it sounds. Thanks for taking the time to do the recording!
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10 Posts

10-11-2012

Switzerland

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  • Message 12 of 38

Re: T420s coil/"CPU" whine recordings and request for service

2012-10-11, 8:46 AM

I noticed that mine only has a whine when using the displayport.  Any type of update on display,  especially scrolling, causes noise.  If I use my docking station's DVI port, the problem goes away.

 

The whine is present regardless if it's using the docking station's displayport or the notebook's mini-displayport.

 

 

edit: sorry, I just saw that this is for the t420s.  Mine is a t430s so it might not apply.

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143 Posts

11-15-2009

Stockholm

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  • Message 13 of 38

Re: T420s coil/"CPU" whine recordings and request for service

2012-10-11, 12:56 PM

The techs that I sent the laptop into have not been able (at least not yet) to replicate my problem. They indicated that they heard nothing over the spinning of the fan, to which I responded that they needed to ensure that the fan wasn't spinning.  My fan doesn't spin all the time (I had luck with my replacement T420s) so when it's silent, the whine is very apparent.

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2651 Posts

03-21-2012

Malaysia

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  • Message 14 of 38

Re: T420s coil/"CPU" whine recordings and request for service

2012-10-15, 9:02 AM

Hi all,

 

Was reading through this thread and I'd like to get the teams for an analysis for this issue. In order for me to do so I'd like to get you machine formation. If could please PM me the details, that would be of great help. The details I need can be found below.

 

• Machine Family (e.g. T61)
• Machine Type Model (e.g. 7660-14A)
• Machine Serial Number (e.g.. L3-234A)
• Bios version
• Chipset model and driver version
• RAM (e.g.. 2GB DDR3)
• OS (e.g.. Win 7 64-bit Ultimate)

 

• Steps taken prior to a reported issue (for an example software or hardware installed)
• Driver list and version of components (depends on issue discussed)

• First and Last Name

• Contact Phone Number
• Email Address
• Mailing Address
• Country of customers resided

 

Hope to hear from,

 

Regards

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143 Posts

11-15-2009

Stockholm

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  • Message 15 of 38

Re: T420s coil/"CPU" whine recordings and request for service

2012-10-15, 9:11 AM
Excellent, will send you a PM right away.
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2651 Posts

03-21-2012

Malaysia

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  • Message 16 of 38

Re: T420s coil/"CPU" whine recordings and request for service

2012-10-15, 9:38 AM

hi calkenneth,

 

Pm sent

 

regards

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143 Posts

11-15-2009

Stockholm

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  • Message 17 of 38

Re: T420s coil/"CPU" whine recordings and request for service

2012-10-20, 7:26 AM
NINE: I received my laptop back from the US. They were unable to replicate the problem, so they sent it back with a new SSD and asked me to try it again.

The problem is still relevant. Since this is most likely due to the coils on the motherboard, I presume this has to do with the power source and how it's regulated on the motherboard.

What's the next step? I'm based in Stockholm, Sweden.
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143 Posts

11-15-2009

Stockholm

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  • Message 18 of 38

Re: T420s coil/"CPU" whine recordings and request for service

2012-10-20, 11:24 AM
I think I found the reason why the US team was unable to replicate the problem. They weren't running the laptop with the battery inserted.

When I take the battery out and run it ONLY on AC power, the whine completely disappears. I think this has to do with the fact that the coils are used to regulate voltage and the load on the motherboard is different depending on whether a battery is inserted or not (even if it's not charging).

Once I put the battery in, the whine comes back, regardless of whether I am running on battery or AC.
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229 Posts

10-08-2012

md, us

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  • Message 19 of 38

Re: T420s coil/"CPU" whine recordings and request for service

2012-10-20, 20:36 PM

that's a good finding.

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5 Posts

11-02-2012

Hong Kong

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  • Message 20 of 38

Hi I'm also experiencing a cpu whine problem on my T430s....

2012-11-02, 15:22 PM

Hi I'm also experiencing a cpu whine problem on my T430s.  I listened to your recordings and it sounds similar - high pitch beeping/whining.  

 

The difference is that my whining happens whenever the system is idle, or more specifically only when the system isn't receiving any input.  During typing, the whining is intermittent but its there, in between key presses.  Even if I hold down the key its still there.  What gets rid of it entirely is continuous movement on the touchpad or continously moving a usb mouse.

 

This is very annoying when working in a quite room simply because its so high pitch, and worse it isn't continous so you can't zone out of it.  It is a faily continuous high pitched whine littered with intermittent pauses which makes it very noticeable.

 

Edit: turning off CPU power management in BIOS seems to get rid of the problem, though it might've just lowered the noise significantly, I can't tell.  Obviously this drastically lowers the already short battery life by constantly running the CPU at full speed, not to mention the ~10C temp increase.                                                                                                             

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