13 Replies Latest reply: Oct 31, 2014 4:19 AM by coligreens
simpson309 Level 1 Level 1

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

    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.

  • simpson309 Level 1 Level 1

    thanks i'll take a look at the back, it is under warranty though. is it best to just take this big thing in to any apple store?

  • X423424X Level 6 Level 6

    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

    Did you ever find out what was wrong?

  • simpson309 Level 1 Level 1

    not exactly. I dropped the monitor off at apple in Januaray for 5 days and they:


    1. Replaced the entire panel with a damaged panel with a few dead pixels and smudge marks.


    2. Did not fix the buzzing noise coming from the power supply.


    Needless to say I was not too surprised since it's Apple, one day this fall I plan to go back to the store and make sure they repair it right.

  • tommy41950 Level 1 Level 1

    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

    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

    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?



  • simpson309 Level 1 Level 1

    similar noise yes.. but quieter. but to answer your question i never did take the display back again since the noise wasn't too noticable with all the other background noise in my place. but i do plan to take it back for repair shortly before the apple care runs out, which happens to be in february 2014.

  • keshavdv Level 1 Level 1

    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

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

  • coligreens Level 1 Level 1

    I am having this problem to. Keeps getting worse. Im still under apple care thankfully. Bringing it in tomorrow. The buzz is not from the speakers.

  • coligreens Level 1 Level 1

    IIt's still covered by apple care. They are replacing the power supply and the logic board for freesies