A1708 (820-00840-A) - no image

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  • thuygsm
    Nguyen Van Thuy
    • Jan 2023
    • 16
    • vietnam

    #1

    A1708 (820-00840-A) - no image

    Hello everyone
    I'm having a problem with my 2017 13'' macbook Pro
    Initially I had 0V at C3204 and C3104, I tested and replaced the U2800 and then I got 1.1v as well.
    The fan is spinning, the cpu is also hot, but I don't have a screen, no caps lock key light and no starter bell, I just get the feeling of a trackpad
    I checked the CPU voltage at (L7210 - L7220) 0.945V they won't go back to 0.6~0.7v, I also torched the CPU with a temperature of 200 times for 20s, but still no result
    Current voltage hangs forever at 19.1v 0.473A​
  • mon2
    Badcaps Legend
    • Dec 2019
    • 14022
    • Canada

    #2
    This is an immediate current draw? Fixed at this value? Test each inductor for a short.

    What is the voltage to ground of ppbus_g3h?

    Comment

    • thuygsm
      Nguyen Van Thuy
      • Jan 2023
      • 16
      • vietnam

      #3
      Originally posted by mon2
      This is an immediate current draw? Fixed at this value? Test each inductor for a short.

      What is the voltage to ground of ppbus_g3h?
      Thank you for your reply: In the first 10 seconds, I received 0.941v and then 0.945v permanently at (L7210 - L7220) ppbus_g3h 13.04v 19.1v 0.473A, fluctuating 0.563A

      Comment

      • mon2
        Badcaps Legend
        • Dec 2019
        • 14022
        • Canada

        #4
        Review this thread:

        https://repair.wiki/w/MacBook_Pro_A1..._at_20V_repair

        Comment

        • thuygsm
          Nguyen Van Thuy
          • Jan 2023
          • 16
          • vietnam

          #5
          Originally posted by mon2
          PPBUS_G3H_P3V3S5 :13.4v
          PP5V_S5 :5.10v
          thank you!

          Comment

          • mon2
            Badcaps Legend
            • Dec 2019
            • 14022
            • Canada

            #6
            Review the following power up sequence flow chart.

            Click image for larger version

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            Click image for larger version

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            Click image for larger version

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