A1286 - LOGIC BOARD 820-2523-B - NOT BOOT

Discussion in 'MacBook Pro' started by fabry79, Oct 4, 2018.

  1. fabry79, Oct 4, 2018
    Last edited: Oct 7, 2018

    fabry79 macrumors newbie

    fabry79

    Joined:
    Aug 14, 2018
    #1
    Good Morning,
    i'm Fabrizio From Italy

    I'm a newbie about logic board repair ,
    and i require you a little help.

    I've in my hands a macbook pro a1286 - motherboard 820-2523-B ,
    no boot - black screen.

    With magsafe and battery connected i've green light of led and after orange light that confirm me battery recharge.
    after SMS reset + PRAM reset , the fans start at maximum speed for a few seconds , then macbook turns off.

    with only battery connected the macbook doesn't start.

    The IRF6710 and irf6795 are really really hot..


    The GPU is a NVIDIA MPC79-MXT-B3.

    I don't understand where is the problem...
    Can help me?

    Tnx for your attention and greetings from Italy,
    Fabrizio
     
  2. fabry79 thread starter macrumors newbie

    fabry79

    Joined:
    Aug 14, 2018
    #2
    Tested following resistors :

    R7120 -> OK
    R 7112 OK
    R 7121 OK
    R7100 OK
    R7101 --1.58 kOHM ( ISTEAD OF 3.65 K)
    R7106 --1.58 kOHM (ISTEAD OF 3.65 K)
     
  3. fabry79 thread starter macrumors newbie

    fabry79

    Joined:
    Aug 14, 2018
    #3
    hi,
    in the meantime I bought the IRF MOSFETs.
    when they arrive, I will proceed with the replacement..
    other suggestions? hasn't happened to anyone?
     
  4. fabry79 thread starter macrumors newbie

    fabry79

    Joined:
    Aug 14, 2018
    #4
    Changed IRF6710 ..
    now i've 0 volt on all test point of the U7100

    battery charge normally ....( green light on magsafe , and after orange)

    Can Help me?
     
  5. fabry79 thread starter macrumors newbie

    fabry79

    Joined:
    Aug 14, 2018

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4 October 4, 2018