Macbook Air M1 (820-02016) over voltage 3.2V at line PP1V8_S2

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  • gomonx
    New Member
    • Jan 2023
    • 3
    • thailand
    #1

    Macbook Air M1 (820-02016) over voltage 3.2V at line PP1V8_S2

    Macbook Air M1 (820-02016) over voltage 3.2V at line PP1V8_S2 (from PMU BLUK3)

    I have replaced the ic u8100 but still the same problem. Where should I check next?

    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14172
      • Canada
      #2
      This is a dangerously high voltage and may have caused other damage. Check for the presence of the FB leg resistor @ R820A.

        Comment

        • gomonx
          New Member
          • Jan 2023
          • 3
          • thailand
          #3
          Originally posted by mon2
          This is a dangerously high voltage and may have caused other damage. Check for the presence of the FB leg resistor @ R820A.
          i remove U8100 and checked the d18 pin with the L8230.= 0 Ohm
          I think the feedback controll is no problem​

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 14172
              • Canada
              #4
              Then it appears that the higher voltage of 3v2 is backfeeding from a leak somewhere on the board. That is, it is not this 1v8 rail that is creating a higher voltage but someone may be leaking the higher voltage onto this low power rail. Remove all power. Meter in diode mode. Short the meter probes and you will hear a tone beep.

              Then one meter probe on L8230 and the other meter probe on another inductor on the board. Test each remote inductor on the board against this L8230. Stop if you hear a tone beep and confirm which inductor is shorting.

                Comment

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