Unibody Macbook makes high pitch sound at certain screen brightness levels

Discussion in 'MacBook' started by Molopo, Jan 27, 2009.

  1. Molopo macrumors regular

    Jul 23, 2008
    Whenever my screen is not turned up to the maximum brightness, a really high pitched sound is emitted from the laptop. If you've ever heard the "mosquito ringtone", that's basically what it sounds like. Really odd. It's definitely got something to do with the screen brightness, and I basically can't use my laptop at medium brightness because the sound drives me a little nuts. Turning the brightness to the lowest setting makes the sound less intense, but it's still audible. Is there any way to fix this? Also, would this problem be grounds for a replacement? Thanks.
  2. yellowmuffins macrumors newbie

    Jun 17, 2007
    sorry to resurrect this thread, but I get the same exact thing on my unibody macbook pro. I can't use my mbp at medium brightness either as it just drives me crazy. Molopo, did you ever find a fix/did you get yours replaced? Anybody else?
  3. l.a.rossmann macrumors 65816


    May 15, 2009
    This is a common thing with some LCDs.

    It's kind of like the dining room light dimmer that buzzes when you turn it down. The high end, SMPS induced noise version of that.

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