iPad Pro 12.9 5th Gen Backlight Issue

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  • cheebster
    Badcaps Veteran
    • May 2008
    • 370

    #1

    iPad Pro 12.9 5th Gen Backlight Issue

    Hello, got an iPad Pro A2378 12.9 5th gen with no backlight. Got another test unit without screen, tested the screen, still no backlight with the test unit.
    Figured out the backlight on the screen was bad, ordred a new backlight from mobilesentrix, *carefully replaced it* without damaging the lcd, oh well.
    Final result, issue is still there, the screen has no back lights. So i'm back to square one, with 3 hours less and 100$ out, issue still on the screen.
    The panel is still ok, i can see the apple in the middle of the screen when it kicks in, just no backlight.
    Anyone has a clue what else i can do other than spending 300ish on another screen ? I just don't get why it doesn't work having replaced the whole backlight of the panel.
    Thanks ! Vincent.



  • elecsoluces
    Senior Member
    • May 2020
    • 66
    • France

    #2
    Hello,

    Backlight issue is a common problem on all ipad pro 12"9.
    It's a motherboard problem, check around fpc lcd you will find burnt ferrite bead.
    You can post a picture if you want help to locate it.
    Experience is needed to replace this component.

    Comment

    • cheebster
      Badcaps Veteran
      • May 2008
      • 370

      #3
      Hi there, thanks for your reply. Here is a picture. Is that the area you are refering to ? I have no problem replacing parts, also i have access to ZXW. But i have the same issue on 2 boards ?
      Attached Files

      Comment

      • cheebster
        Badcaps Veteran
        • May 2008
        • 370

        #4
        En passant je parle francais ! Je me demande si c'est possible que j'ai eu le meme probleme sur 2 ipads differents.

        Comment

        • bohaboha
          Badcaps Veteran
          • Nov 2012
          • 973
          • sweden

          #5
          Originally posted by cheebster
          En passant je parle francais ! Je me demande si c'est possible que j'ai eu le meme probleme sur 2 ipads differents.
          hi easier in English use Google translate

          Comment

          • cheebster
            Badcaps Veteran
            • May 2008
            • 370

            #6
            It seems from ZXW that PP_LUME_OUT is missing, 0v there. Should that be enabled even if no lcd connected ?
            Attached Files

            Comment

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