27 inch Cinema Display Issues: Sound, light sensor

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Posted:
in Current Mac Hardware edited January 2014
hi,



this is my first post in this forum and i'd like to ask your help.



two weeks ago i got my 27" ACD, which initially worked beautifully.

now i have the following symptoms (appearing randomly):



- sound output through display stops

- sound input through display stops

- onscreen volume indicator appears lagging behind after input (and has no function)

- no auto adjustment of brightness to ambient light

- display mic input incredibly low (compared to built in MBP mic, which is situated about half a meter away).



here is what i tried:



- installing LED Cinema Display Software Update 1.0 (twice): no effect

- resetting SMC: fixes the issue - for about a day

- unplugging ACD power: fixes the issues - for about 4 days

- unplugging ACD USB & MDP: sometimes fixes the issue - four a couple of hours

- deleting the preferences .plist files (com.apple.driver.AppleUSBDisplays.plist; com.apple.audio.DeviceSettings.plist; com.apple.audio.SystemSettings.plist) : no effect



additionally, installing the software update doesn't give me an option to output the sound through MDP, but USB only (see: http://support.apple.com/kb/HT4293).



called apple support, but they have not heard about the issue, have no help to offer, asked me to monitor the issue for another week or so and if re-occuring, i could exchange the display. judging from what i read across the web, replacing the display does not help.



although the issue is being discussed in two other forums, i thought i ask for help here, since this forum seems to be populated by a technically adept crowd.



many thanks in advance all!

Comments

  • Reply 1 of 1
    Quote:
    Originally Posted by Ohto View Post


    - sound output through display stops

    - onscreen volume indicator appears lagging behind after input (and has no function)



    Yes, I have had these problems. Good to know I'm not the only one.



    Quote:

    - sound input through display stops

    - display mic input incredibly low (compared to built in MBP mic, which is situated about half a meter away).



    Haven't really tried out the mic yet, but I certainly can.



    I'll be calling Apple support, too; as well as posting feedback on the website. That seems to occasionally work.
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