MacBook Pro 13 (A1278) Unibody - No Backlight. LCD works though.

Discussion in 'MacBook Pro' started by Waldoctg, Jun 19, 2013.

  1. Waldoctg macrumors newbie

    Joined:
    Jun 19, 2013
    #1
    Hey folks,

    I searched the forums and found a couple topics similar to this, but didn't seem to be what my problem was... anyways...

    I bought this Macbook Pro off of a kid who said someone dropped it and the LCD stopped working. Hoping I can get some insight to diagnose and fix the problem. Would greatly appreciate it.

    Thanks,
    Waldoctg
     
  2. nickandre21 macrumors 6502a

    Joined:
    Jun 21, 2012
    #2
    start by checking if the display cable is connected well, if the issue still occurs you will have to check with another display. Hard to tell what could be the issue for now.
     
  3. Waldoctg thread starter macrumors newbie

    Joined:
    Jun 19, 2013
    #3
    Naw. LCD works. I tested with a flashlight.

    The backlight is what does not work. THAT's the real problem...

    Anyone?
     
  4. sparkyms macrumors 65816

    Joined:
    Feb 22, 2007
    Location:
    Southampton UK
    #4
    Could be the inverter board, unlikely though as the backlight is always off.

    Sounds to me like you're gonna need a new display.
     
  5. Waldoctg thread starter macrumors newbie

    Joined:
    Jun 19, 2013
    #5
    Lol wait, even though I can see the display with a flashlight?

    Like I think it is the backlight inside the MB. Unless the backlight is directly connected to the MB...?
     
  6. nickandre21 macrumors 6502a

    Joined:
    Jun 21, 2012
    #6
    the back light is in the display housing and gets its power from the display cable
     
  7. sparkyms macrumors 65816

    Joined:
    Feb 22, 2007
    Location:
    Southampton UK
    #7
    Yes, even though you can see the display is *on*, it's likely you will need a new display. As another poster has said the backlight is within the display and it's not something you can replace.

    You can decide not to believe us and waste some time by hacking your display to bits looking to change the backlight if you want though.
     
  8. Sanket123 macrumors newbie

    Joined:
    Oct 30, 2016
    #8
    Hello guys I have an 820-2936 Macbook pro late 2011 13'' i5 A1278


    I Have chimes and display but unable to get back light

    I can see the image using an flashlight from behind


    I have checked the display by connecting to an working screen, but it too doesn't have backlight


    board has LP8550 WLED driver


    and it doesn't boost output


    I have an feedback of at

    PPVOUT_SW_LCDBKLT_FB probe 613 12.5v


    I am posting all the readings in the pictures



    Kindly guide me to help me find what the problem is,

    am i supposed to replace LP8550 .


    Please guide me


    Thanks in advance :)
     

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