Question about IBM ThinkPad T21 2648 Notebook

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No display made an error in repoting problem the humming sound is coming from under the bottom

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Remove the bottom covers and see if you can track the exact location of the hum. Hopefully the humming is coming from a moving component, ie CD drive, hard drive, fan,etc..., and not being created by a circuitry short. You might also try pulling the hard drive and see if that drive is making the noise. If you can't find it under the bottom covers, then try pulling the keyboard. Anyway, see if you can determine where it is and let me know.

Posted on Aug 28, 2008

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Posted on Jan 02, 2017

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Hello & Welcome to FixYa

If the hum sound is coming from the bottom panel then it is the moto that has gone bad and needs replacement. However, if you hear the sound from the control then it can be due to a bad relay in the control and it is recommended to replace the control completely. Please get back to me if you have any other questions.

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