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Buzzing noise coming out of television when i plug in power cord

I have a Dell C600 that is connected to a tv via docking station. when i plug in the power cord, a buzzing noise comes out of the tv. I have replaced the dock and the laptop and the power cord and it is better than it was but the noise is still existant. What should I do?

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  • aries765677 Mar 05, 2009

    Yes the noise still comes out of the speakers even if it is muted on the laptop. When I unplug the power supply the noise stops. But I have replaced literally everything and the noise still persists, its just tolerable now.

  • Jay Selway
    Jay Selway May 11, 2010

    Does the buzzing stay regardless of whether there is a signal coming from the laptop, say if it is muted on the laptop, but not on the TV Set?

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Right, the problem is caused by the earthing of the power supply.

You need a box, which isolates the earth from the laptop to the television, known as an Isolation Transformer. This goes in between your laptop and television, and removes the cause of the hum.

The other option is entirely at your own risk, as you're dealing with mains electricity, however, cover the earth pin with some insulation tape, thus stopping the power supply from earthing. Keep a close eye on the condition of your power supply and cable, as you will not be protected against shock if a fault should develop.

The same problem exists with Acer Laptops, as I have one, and use an isolation box when I want to play music in venues from my Laptop.

Posted on Mar 06, 2009

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