2012 iMac 27" Backlight dead...

Discussion in 'iMac' started by Fried Chicken, May 11, 2019.

  1. Fried Chicken macrumors 6502

    Fried Chicken

    Joined:
    Jun 11, 2011
    #1
    It was working this morning, then I got back to the computer and the backlight was off.
    I did a PRAM reset, and it came back. Then I was fooling around and *poof* gone.

    I'm on the phone with apple now (they've been hugely helpful in the past).

    Is it possibly not a hardware issue? I even read somewhere filevault disk encryption can cause this to happen.
     
  2. Fried Chicken thread starter macrumors 6502

    Fried Chicken

    Joined:
    Jun 11, 2011
  3. codernova macrumors member

    codernova

    Joined:
    May 13, 2019
    #3
    Sounds like maybe a capacitor for the backlight is failing...? Can you see an image on the screen if you use a flashlight on it?
     
  4. Fried Chicken thread starter macrumors 6502

    Fried Chicken

    Joined:
    Jun 11, 2011
    #4
    Yep;

    I'm thinking a capacitor too, but I don't know where to find it.
     
  5. codernova macrumors member

    codernova

    Joined:
    May 13, 2019
    #5
    I'm not the one to ask, but I'm sure there's a how-to or a paid service that could fix an iMac's inverter or capacitors. Maybe someone else here has experience with it?
     
  6. Fried Chicken, May 15, 2019
    Last edited: May 15, 2019

    Fried Chicken thread starter macrumors 6502

    Fried Chicken

    Joined:
    Jun 11, 2011
    #6
    Surprisingly difficult to find.

    But that's not the difficult part, the difficult part is finding what capacitor to replace in the first place.
    Even Louis Rossmann couldn't help.

    [edit]

    I should add, I suspect it's the Power Supply. I have a brand new logic board in here (courtesy of apple, despite being out of warranty by 3 years). It could also be something built in the display. I also suspect a cable somewhere might not be connected right.

    I'll open the iMac tomorrow and report back.
     
  7. Brian Y macrumors 68040

    Joined:
    Oct 21, 2012
    #7
    Given the backlight inverters can be had for around £20, it's probably not worth your time hunting down a capacitor!
     
  8. Fried Chicken thread starter macrumors 6502

    Fried Chicken

    Joined:
    Jun 11, 2011
    #8
  9. codernova macrumors member

    codernova

    Joined:
    May 13, 2019
    #9
    If they just replaced it, I can't see how it's the inverter then. Have you called Apple since the repair?
     
  10. Fried Chicken thread starter macrumors 6502

    Fried Chicken

    Joined:
    Jun 11, 2011
    #10
    I did, but I do't have a nearby apple store, and they don't really work on "vintage" products....

    AS IF 5 years old is "vintage" -_-

    it's my iMac; I have my 2006 iMac and it's still working fine. AND CPUs haven't gotten much better over time, nor have GPUs, with all this emphasis on stupid laptop computing.....

    I need to call them again
     

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9 May 11, 2019