how to diagnose if it is bad GPU or bad GPU RAM

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  • ktmmotocross
    Boardkiller
    • Feb 2014
    • 3553
    • slovakia

    #1

    how to diagnose if it is bad GPU or bad GPU RAM

    Hello.
    Have macbook with bad GPU. after replace GPU with new IC, the book come back in life but have bad video image. There is GPU RAM on the other side oof bosrd and it be heated many times.

    Do u think that bad image is due to bad new GPU IC or have cracked ball under GPU RAM ?
    Attached Files
  • mcplslg123
    Badcaps Legend
    • Jun 2015
    • 7262
    • india

    #2
    Re: how to diagnose if it is bad GPU or bad GPU RAM

    Both are probable so you can never be sure unless and otherwise you remove those ram chipsets.

    Comment

    • mosfetratus
      Sure Not
      • Feb 2019
      • 174
      • Resistron

      #3
      Re: how to diagnose if it is bad GPU or bad GPU RAM

      Bad video ram would crash the system.

      Could be two things, bad chip or bad soldering. Bad soldering is less likely to be. Higher chance to have a bad chip, what date code is the chip?

      Comment

      • piernov
        Super Moderator
        • Jan 2016
        • 4435
        • France

        #4
        Re: how to diagnose if it is bad GPU or bad GPU RAM

        Very hard to find good GPU. 216-0810001 and 216-0810005 are not available, 216-0809000 maybe but almost everything is reballed dead GPU.
        So… first thing I suspect the GPU.

        Did you remove the edge bonding of the VRAM though?
        OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

        • ktmmotocross
          Boardkiller
          • Feb 2014
          • 3553
          • slovakia

          #5
          Re: how to diagnose if it is bad GPU or bad GPU RAM

          yes i removed bondig but it was two times heated before with bonding

          gpu was 216-0810005. chip was "new" for a fair price of 16eur from aliexpress. got another chip for another laptop from same supplier and it was good
          Last edited by ktmmotocross; 04-11-2019, 03:40 AM.

          Comment

          • piernov
            Super Moderator
            • Jan 2016
            • 4435
            • France

            #6
            Re: how to diagnose if it is bad GPU or bad GPU RAM

            That's a dead chip for sure. Even if it did work, it wouldn't work for long.
            OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

            Comment

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