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buzzing noise coming from the back of the display

1136 Views 11 Replies Latest reply: Dec 6, 2013 7:42 AM by FCPXLL RSS
simpson309 Level 1 Level 1 (0 points)
Currently Being Moderated
Dec 5, 2011 7:11 PM

there is a buzzing noise coming from the back of my 27" cinema display.. I can't exactly tell if it's from the speakers (I think) or more near where the AC cord plugs in.


any suggestions? thanks

Windows 7
  • X423424X Level 6 Level 6 (14,190 points)

    One possible speaker check would be to play some sound both loud and soft through each left/right channel to see if that shows anything that might contribute to the sound.


    There is a fan inside these displays.  You can see its exhaust vent in the middle back just above the power cord.  So the fan may be your noise source.


    If this is still under warrantee you might want to let apple look at it or replace the display itself.

  • X423424X Level 6 Level 6 (14,190 points)

    Definitely yes.  At $1000 it's not something you want to fool with if the professional support is available for free.


    I always save the original boxes and styrofoam, and the monitor's box has a carrying handle, so sticking it in it's original box makes it easier and safer to transport (been there, done that).

  • keshavdv Level 1 Level 1 (0 points)

    Did you ever find out what was wrong?

  • tommy41950 Level 1 Level 1 (0 points)
    Currently Being Moderated
    Nov 15, 2012 7:00 PM (in response to simpson309)

    I have just got the buzzing sound started suddenly this morning after waking the computer from sleep. I am connected to a MacBook Pro 15". Otherwise it is working perfectly, but the buzzing is annoying, and I wonder if it's potentially dangerous, like that it will burst into flames, etc.

    Doesn't seem to be a common problem as this is the first referrence I have seen to anyone else having the same issue.

  • tommy41950 Level 1 Level 1 (0 points)
    Currently Being Moderated
    Nov 19, 2012 5:22 PM (in response to tommy41950)

    Have sorted my problem out folks - it wasn't the monitor making the noise - it was my Harmon-Kardon Soundsticks. I suspect that a repair to them is probably more expensive than buying some new ones.

  • FCPXLL Level 1 Level 1 (20 points)

    Hi Simpson309!


    I have the exact same problem with my 27" LED Cinema Display. Buzzing from the back and also from under the screen. First I suspected the fan but now I am more into the theory that the power supply is the problem, just like you are saying.


    Is the sound like the sound in this videon?



    In fact I think it is the capacitors on the power supply that are failing/getting old and I plan to replace them as Apple Service most definitly are either going to put a brand new (expensive) power supply in there or replace the wrong part like in your (and many others) case.


    What has happened since your last post? Have you found a solution?



  • keshavdv Level 1 Level 1 (0 points)

    That's the same noise I was experiencing and it seemed to be correlated to energy consumption (higher brightness = more buzzing). I ended up taking it to Apple and asking them to replace the power supply and haven't heard any buzzing ever since. It cost about $100 to fix it.

  • FCPXLL Level 1 Level 1 (20 points)
    Currently Being Moderated
    Dec 6, 2013 7:42 AM (in response to keshavdv)

    Alright! Thats intresting. I will post here again when I have replaced the capcitors and we will see what happens.


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