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iMac Dark Area Left Side Screen

7760 Views 11 Replies Latest reply: Dec 2, 2012 12:10 PM by cYrEaD RSS Branched to a new discussion.
hansenodense Calculating status...
Currently Being Moderated
Jun 14, 2011 3:06 PM

Worked late couple of nights ago - watched the left side of the screen go darker. Turned the iMac off for 15 minutes - and the screen was okay again.

Till today... the dark area - left side of screen - turned up again. Disappeared again for 5-10 seconds and the problem reoccured.

The iMac is cold at the bottom of the screen but pretty hot in the top... wondered if it has something to do with the heat generated.

Often happens when iMac is turned on for several hours.


Any ideas?

The iMac is from fall 2009.

iMac, Mac OS X (10.6.7), iMac 27" 2.8 GHz Intel Core i7
  • MadisonP Level 5 Level 5 (4,485 points)
    Currently Being Moderated
    Jun 14, 2011 8:40 PM (in response to hansenodense)



    Sounds like the backlight behind the LCD is going out.


    Reset the SMC and then test:

    Reset the PRAM and then test:



    If the issue persists after you follow the above steps you are experiencing a hardware issue and your system requires evaluation and / or service. You may wish to make an appointment with a Mac Genius at an Apple store, contact AppleCare via phone, or contact an Apple Authorized Service Provider for assistance.

  • MadisonP Level 5 Level 5 (4,485 points)
    Currently Being Moderated
    Jun 15, 2011 9:00 PM (in response to hansenodense)
    Resetting SMC and PRAM... I do it reguarlly - is not helping.

    These resets should only be done to troubleshoot an issue.  They are not maintenance techniques.  Careful of overuse.


    If you have AppleCare on your system, contacting service as I suggested above would be advisable.  If you don't have AppleCare you could still contact a local Apple Authorized Service Provider to get a price estimate if you are interested.


    Best of luck to you.

  • MadisonP Level 5 Level 5 (4,485 points)
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    Jun 27, 2011 5:09 PM (in response to hansenodense)

    what part of the iMac is the problem? Is it the screen? The backlight? A tiny little connector... ?

    Most likely the backlight but when you take it in for service they will diagnose the issue.  I have the same model as you and have no such issue so I would not go so far as to say its all the the 27" iMacs. Taking it in for service is the way to go.

  • VAENG Calculating status...
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    Nov 28, 2011 6:45 PM (in response to hansenodense)

    I have the same problem on my 2009 iMac 27.  I've seen a number of posts on the internet; however, I've not seen anyone post the cause / the part that needs to be replaced.  Any help would be appreciated.

  • cYrEaD Level 1 Level 1 (0 points)
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    Dec 1, 2012 6:09 PM (in response to hansenodense)

    This is happening to me on a 27" Imac bought in 2011.  Left side of the screen is flickering and periodically going quite dark.  Apparently I'm 40 days out of waranty.  From doing a couple basic google searches I find this is a common issue with these LG manufactured screens in the 27" imac's from 2009 to 2012.  But Apple isn't issuing a recall...  Cant wait to see how much a repair will cost - I hear $1000 for apple to do this.  Cant believe a 1 year old computer that costs over $2k is failing already - and the problem is this widespread.

  • cYrEaD Level 1 Level 1 (0 points)
    Currently Being Moderated
    Dec 2, 2012 12:10 PM (in response to hansenodense)

    thanks hansenodsense.  guess Ill take the thing apart and get the soldering iron out.  i bought the computer to do some photo editing so I really cant live with apples shoddy construction/poor engineering causing the left side to be this dark.  if I mess something up I wont be buying another imac because it seems this issue is happening still with 2012 computers!  Get your act together apple.


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