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13 Posts

09-16-2011

Dimitrovgrad, Bulgaria

37 Signins

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  • Posts: 13
  • Registered: ‎09-16-2011
  • Location: Dimitrovgrad, Bulgaria
  • Views: 303
  • Message 1 of 4

T520i CPU whine with 90W adapter only

2015-10-29, 19:39 PM

Hello,

I have upgraded my T520i 4239CTO from i3-2310M to i7-2860QM.

Since my 65W (US plug) adapter couldn't run i7 on max power, I bought an used 90W(EU plug, 3 wires) adapter.

Using the new adapter I can hear the so called "CPU whine" from left side of laptop.

It only happens when CPU is running light tasks(browser, vlc). With games, there is no noise.

My questions are:

1) Is the 90W adapter be faulty, giving to much power, when CPU is idle

2) Can it damage the motherboard

3) Does the US/EU plug matter. My laptop was bought from US.

Thinkpad T520i: i7-2860QM, 16GB RAM, 500GB Seagate, Linux
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13 Posts

09-16-2011

Dimitrovgrad, Bulgaria

37 Signins

303 Page Views

  • Posts: 13
  • Registered: ‎09-16-2011
  • Location: Dimitrovgrad, Bulgaria
  • Views: 303

Re: T520i CPU whine with 90W adapter only

2015-11-10, 13:38 PM

Following the advice of a local electro technician, I have replaced the two capacitors at Vout of AC adapter with 2 1000mF and whine is gone.90W Adapter internals

Thinkpad T520i: i7-2860QM, 16GB RAM, 500GB Seagate, Linux
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13 Posts

09-16-2011

Dimitrovgrad, Bulgaria

37 Signins

303 Page Views

  • Posts: 13
  • Registered: ‎09-16-2011
  • Location: Dimitrovgrad, Bulgaria
  • Views: 303
  • Message 2 of 4

Re: T520i CPU whine with 90W adapter only

2015-10-30, 15:55 PM

Today I noticed, that when my screen turns off, after 2 min of inactivity,

noise goes away.

Thinkpad T520i: i7-2860QM, 16GB RAM, 500GB Seagate, Linux
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13 Posts

09-16-2011

Dimitrovgrad, Bulgaria

37 Signins

303 Page Views

  • Posts: 13
  • Registered: ‎09-16-2011
  • Location: Dimitrovgrad, Bulgaria
  • Views: 303
  • Message 3 of 4

Re: T520i CPU whine with 90W adapter only

2015-11-07, 11:28 AM

I noticed the 90W AC adapter ( FRU 45N0068) also makes the exact same noice as laptop.

Thinkpad T520i: i7-2860QM, 16GB RAM, 500GB Seagate, Linux
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13 Posts

09-16-2011

Dimitrovgrad, Bulgaria

37 Signins

303 Page Views

  • Posts: 13
  • Registered: ‎09-16-2011
  • Location: Dimitrovgrad, Bulgaria
  • Views: 303
  • Message 4 of 4

Re: T520i CPU whine with 90W adapter only

2015-11-10, 13:38 PM

Following the advice of a local electro technician, I have replaced the two capacitors at Vout of AC adapter with 2 1000mF and whine is gone.90W Adapter internals

Thinkpad T520i: i7-2860QM, 16GB RAM, 500GB Seagate, Linux

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