27" iMac Lighting Issue

Discussion in 'iMac' started by ucfgrad93, Mar 19, 2012.

  1. ucfgrad93, Mar 19, 2012
    Last edited: Mar 19, 2012

    ucfgrad93 macrumors P6


    Aug 17, 2007
    I have a 27" iMac and am having a problem with the backlight. If I am looking at the screen, the right half of the screen is brighter than the left half of the screen. I have tried adjusting the settings, taking off auto-brightness, etc with no luck.

    Any ideas or suggestions?
  2. bakura macrumors member

    Jan 30, 2011
    I have EXACTLY the same problem on my 2011 iMac (27') that I bought in may. I tried everything (reset SMC, PRAM...), and it appears that many people have this problem, and that the left part is always dimmer than the right one (which is my case too).

    Apparently, the problem is because the power source is situated on the left part of the screen and generates a lot of heat.

    As a consequence, I bought an AppleCare (hey, having this problem after only 9 months, I'd better buy the AppleCare :D), and I asked Apple to repair it in april. I think they'll change the backlight system (or the whole computer ?).

    But yes, this is a very annoying problem and apparently quite common, unfortunately.

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