Reball reliability issue

Discussion in 'MacBook Pro' started by geekdad, Apr 14, 2014.

  1. geekdad macrumors newbie

    Joined:
    Jan 27, 2013
    Location:
    Indiana
    #1
    Hello Everyone,

    I have been repairing circuit boards for a while with pretty good reliability. I have one unit that is a problem though. I have kept this unit for testing, since I am particularly interested in why it has such low reliability.

    Failure mode is always the same - glitchy display after 4-5 weeks of use. 2-3 restarts after initial error the unit boots with a black screen.

    I have reballed the GPU 3 separate times. Each time it is a complete process of removing the chip, removing the solder, ultrasonic cleaning, and then reballing the chip, chip placement on the board, etc. I use lead solder balls.

    I have changed material lots for both the solder balls and the flux; in case it was something wrong with them. My best guess is that the GPU itself is faulty, and the reflow thermal cycle is "fixing" something in the chip package temporarily. I have ordered a new GPU to replace the current chip.

    I'm interested to hear what you think it may be.

    Kind Regards,
    Adam
     
  2. KevinC867 macrumors 6502a

    Joined:
    Jun 8, 2007
    Location:
    Saratoga, CA
    #2
  3. yjchua95 macrumors 604

    Joined:
    Apr 23, 2011
    Location:
    GVA, KUL, MEL (current), ZQN
    #3
    If you're working on a 15"/17" early/late-2011 MBP, there's a manufacturing flaw in all of those logic board that causes the AMD Radeon card to fail. There is no permanent fix to it other than re-soldering a new Radeon GPU it.
     

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