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8 Posts

07-13-2012

California

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t420s static noise

2012-07-13, 23:48 PM

Hi all,

 

So my t420s has this weird, stati-like noise that seems to come from the fan. No, it is not the fan (actually I don't mind the fan at all) It isn't the speakers either.

It seems to happen when I'm using the battery and as soon as I plug it in, the noise goes away. It's pretty strange. This isn't the first time I hear this on a t420's. Does enyone have this issue? Is it bad? Should I be worried?

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229 Posts

05-22-2012

Hong Kong

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  • Posts: 229
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Re: t420s static noise

2012-07-16, 10:39 AM
Hi jonathan1636,

Please try update latest BIOS. If problem remains, please kindly contact local lenovo for machine inspection

Worldwide Support Center phone list for ThinkPad, ThinkCentre and ThinkStation systems
http://support.lenovo.com/en_US/detail.page?DocID=HT036550

Fred
T61 + X201i
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229 Posts

05-22-2012

Hong Kong

470 Signins

2944 Page Views

  • Posts: 229
  • Registered: ‎05-22-2012
  • Location: Hong Kong
  • Views: 2944
  • Message 2 of 4

Re: t420s static noise

2012-07-16, 10:39 AM
Hi jonathan1636,

Please try update latest BIOS. If problem remains, please kindly contact local lenovo for machine inspection

Worldwide Support Center phone list for ThinkPad, ThinkCentre and ThinkStation systems
http://support.lenovo.com/en_US/detail.page?DocID=HT036550

Fred
T61 + X201i

0 person found this solution to be helpful.

This helped me too

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8 Posts

07-13-2012

California

22 Signins

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  • Posts: 8
  • Registered: ‎07-13-2012
  • Location: California
  • Views: 292
  • Message 3 of 4

Re: t420s static noise

2012-07-18, 0:27 AM

Hey, thank you! I think it worked. Although I still hear it every now and then.

I will probably still contact them to check it out since my right speaker sounds busted.

Thanks again.

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10 Posts

04-02-2011

United States of America

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  • Location: United States of America
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  • Message 4 of 4

Re: t420s static noise

2012-09-27, 1:37 AM

Hi Jonathan,

 

It sounds like coil whine, or "CPU whine". Does it sound anything like any of these clips?: http://soundcloud.com/discostrings/sets/t420s-coil-whine

 

There's another thread going on about it over here. I'm waiting for a reply on the best way to resolve the issue with my T420s with this problem. I don't just want to send it in and end up with someone unfamiliar with the issue who just replaces the motherboard, doesn't check the new one, the new one has the same problem, and neither I nor Lenovo are any better off...

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