wierd noise from 15" penryn

Discussion in 'MacBook Pro' started by PAC88, Feb 23, 2010.

  1. PAC88 macrumors 6502

    Apr 23, 2009
    thought I'd step away from the arrandale thread for a while to ask something productive. My sister just had the logic board replaced on her 15" penryn mbp.. I believe it's the penryn model.. it has the 128mb ati graphics..

    Long story short.. the computer was working perfectly until the logic board needed replacing under apple care.
    Ever since apple replaced the logic board, there has been a very soft buzzing sound coming from the bottom of the screen near the fans.. it happens when you start the computer from cold after sitting and also when you put very light pressure on the screen. or when you tilt the screen in certain positions you will hear the noise.. It's hard to describe the sound, it almost sounds electrical, like a circuit hissing type sounds or kinda like something is touching the fan while spinning..
    But the service guy also replaced the fan and made sure nothing was touching it, so that was ruled out as the cause. No one at the apple store can figure out what is wrong.. it started doing this only after they replaced the logic board.

    The computer works fine but the noise is an annoyance and worries me about a problem down the road. Has anyone experienced this or know what might be causing it..
  2. Wehrwolf macrumors 6502


    May 21, 2009
    Definitely not a Penryn MBP then. Only the 1,1 and 2,2 models had ATI graphics. Tthe sound could be from the DC inverter board the feeds the LCD backlight.
  3. PAC88 thread starter macrumors 6502

    Apr 23, 2009

    you're right, I just looked on a timeline. It's a late 2006 model, I guess they called these "Merom".

    Anyways, that sounds like it could very well be the cause. It's the only part around that back area of the notebook that hasn't been looked at. Maybe I'll bring it in and suggest they check it out before it gets worse.

    thank you

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