MACBOOK PRO 820-02020 STUCK AT 5V

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  • phantomEVO
    Badcaps Veteran
    • Mar 2013
    • 509
    • USA
    #1

    MACBOOK PRO 820-02020 STUCK AT 5V

    hi to all, please help.

    motherboard is perfect, no signs of corrosion or anything else.

    both usb ports stays at 5v@0,04/0,05amps


    PP3V3_UPC0/1_LDO & PP1V5_UPC0/1_LDO presents
    PPBUS_AON 12.28v
    PP3v8_AON 3.8v
    PP3v3_S2 "bootloop" 2,8/3,0/3,1
    PP1V8_S2 0V
    PP5v_S2 0v
    PP1v25_S2 0V



    any hints? thanks​
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14664
      • Canada
      #2
      Check the voltage to ground of each ldo rail on each cd321x ace controller.

      remove all power and measure the resistance to ground of:

      PP3v3_S2 "bootloop" 2,8/3,0/3,1

        Comment

        • phantomEVO
          Badcaps Veteran
          • Mar 2013
          • 509
          • USA
          #3
          In diode mode, i have 0,400 on PP3V3_UPC0/1_LDO & PP1V5_UPC0/1_LDO

          no problem on PP3V3_UPC0/1_LDO and USBC0/1_3V3LDO_EN
          ​


          PP3v3_S2 is 3,2kohm 0,300mv
          Last edited by phantomEVO; 01-30-2024, 04:21 AM.

            Comment

            • phantomEVO
              Badcaps Veteran
              • Mar 2013
              • 509
              • USA
              #4
              i0ve check some voltage arounf u8100 PP3V8_AON_MPMU_ISNS_VIN 3,8v
              PP1V2_S2 0v
              PP3V3_S2_UPC floating 3v/2,5/1,6/0
              PP1V8_AON_MPMU 1,7
              PP1V5_VLDOINT_MPMU 1,5​

                Comment

                • mon2
                  Badcaps Legend
                  • Dec 2019
                  • 14664
                  • Canada
                  #5
                  Check the resistance to ground of PP1V2_S2.

                    Comment

                    • phantomEVO
                      Badcaps Veteran
                      • Mar 2013
                      • 509
                      • USA
                      #6
                      2,9k

                        Comment

                        • phantomEVO
                          Badcaps Veteran
                          • Mar 2013
                          • 509
                          • USA
                          #7
                          i've done a mistake: 1,2 is present but floating like 3,3s2

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