Dust Blotches and Dirty Rays

Discussion in 'iMac' started by Washac, Aug 3, 2008.

  1. Washac macrumors 68020

    Washac

    Joined:
    Jul 2, 2006
    #1
    Hi


    Since obtaining my Alu 20 inch iMac last year i have been more than happy with it, until recently that is.

    Over the months dirty blotches have appeared down the sides and also dirty rays coming in from the top.

    Today I thought I would pop the carbonite panel from the iMac and clean it all off.

    What a shock I got on removing this panel only to find the dirt is inside the LCD screen itself.

    Now this is not good at all, I have never ever seen this on any other flat screen I have seen or used. It has to be caused by the fans the machine needs to keep itself cool.

    I know I can plug in a second screen, but can I do this and turn the main screen off ?

    What panel would people recommend 20 inch and what cable would I need ?

    Just had a thought that maybe this could be caused by the fact the I/we crank up the fans beyond Apples default settings using smcFanControl, hence more dirt gets sucked in.

    Thanks for reading........
     
  2. Peter Crowder macrumors newbie

    Joined:
    Jul 11, 2008
    #2
    Hi,

    Is this the white iMac we're talking about? If so, I doubt this is a problem caused by dust, as to my knowledge the casing is produced by a 'doubleshot' method using white plastic overlaid and bonded to clear plastic - so there's very little chance of anything getting between the layers.

    This almost sounds like stress marks in the plastic, from expansion and contraction. How warm does your iMac get, and is it exposed to humid or hot ambient air?
     
  3. Washac thread starter macrumors 68020

    Washac

    Joined:
    Jul 2, 2006
    #3
    Sorry 20 inch Alu iMac.

    I did say that I removed the overlaying carbonite panel :)
     
  4. Peter Crowder macrumors newbie

    Joined:
    Jul 11, 2008
    #4
    Hi,

    Sorry, my bad! Are these blotches brown or otherwise 'dust coloured'? I ask because I did find this video on Youtube about a disappearing blotch on an alu iMac screen - http://www.youtube.com/watch?v=xipdRNKIW7g&feature=related . Is this similar to what you're seeing?

    Photos would be useful. Otherwise, I'm driven to suggest an issue with the screen's backlight which might be causing shadows/uneven lighting which look like dust?
     
  5. Washac thread starter macrumors 68020

    Washac

    Joined:
    Jul 2, 2006
    #5
    This what I have :

    http://www.youtube.com/watch?v=QOQGmEiGYjw&feature=related
     
  6. ihabime macrumors 6502

    Joined:
    Jan 12, 2005
    #6
    Carbonite? Did you take the glass off, if so was the dirt on the inner screen itself?

    If it's under warranty I'd take it back to Apple.
     
  7. Washac thread starter macrumors 68020

    Washac

    Joined:
    Jul 2, 2006
    #7
    Yes, I removed the front carbonite (glass) panel and the dirt or whatever this is in inside the lcd itself.

    My Apple store is more than a car ride away and I have no car.

    I have the same background picture on my computer all the time and ny machine is on all day most days. Wondering now if this is the image perstistance thing, have seen one picture of this and it looked lik a water stain, which is what my problem looks like.
     

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