Skip navigation

HT3249: Apple Cinema and Thunderbolt Displays: How to find the serial number

Learn about Apple Cinema and Thunderbolt Displays: How to find the serial number

HT3249 27" inch thunderbolt display buzzing brightness setting

875 Views 6 Replies Latest reply: Feb 25, 2014 10:28 AM by mattsinsight RSS
mattsinsight Calculating status...
Currently Being Moderated
Sep 19, 2013 10:07 AM

My 2012 27" Thunderbolt Display recently (past 2 weeks) started a loud buzzing (electrical-sound) when the brightness of the display is modified brighter or darker.


At 100% brightness, the sound is very audible. Very annoying. Less audible but still buzzing even at the lowest brightness setting.

My display has sat on my desk and not moved more than one time in the last 18 months that I have owned it.


I run external audio and when the audio is completely unplugged and muted, the buzzing is still relative to the brightness-settings.

It's noticeably located on the bottom-left side of the display (when facing it). Moving the display tilt using the back stand-hinge doesn't change the buzzing.


Is anyone else experiencing this?

Does anyone know if Apple is recalling these or fixing them based on a recall due to this sound?

Some forum discussions say that this could be the transformer?


Any suggestions would be helpful.

MacBook Pro, OS X Mountain Lion (10.8.2), Magic Trackpad


More Like This

  • Retrieving data ...

Bookmarked By (0)


  • This solved my question - 10 points
  • This helped me - 5 points
This site contains user submitted content, comments and opinions and is for informational purposes only. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.