MBP wont turn on Only green light on charger

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  • vdrokko99
    Member
    • Apr 2022
    • 16
    • Hungary
    #1

    MBP wont turn on Only green light on charger

    I have a similar problem... I got an old MBP for free, but wont turn on... Only green light on charger. I measured these voltages. If i try to do an smc reset using keyboard, nothings happen, wont go out the green led. I dont know how to continue, please help me.

    SMBUS_SMC_BSA_SCL 3.5V
    SMBUS_SMC_BSA_SDA 3.5V    ​
    Click image for larger version Name: image.png Views: 0 Size: 3.4 KB ID: 3519208
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14028
      • Canada
      #2
      Voltage of PPBUS_G3H to ground?

        Comment

        • vdrokko99
          Member
          • Apr 2022
          • 16
          • Hungary
          #3
          PPBUS_G3H​ to ground is 12.56V

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 14028
              • Canada
              #4
              PPBUS_G3H is good. SMC has booted. Assuming this voltage is stable and not power cycling (on/off/repeat)?

              Do you have PP5v_SUS?

              Remove all power. Meter in resistance mode. Check the resistance to ground of:

              PP5V_S3 ; if this is a low resistance, this is of concern

              Then, meter in voltage mode, check the voltage to ground of:

              P5VS3_EN ; the enable for the above rail

              reference:

              https://www.youtube.com/watch?v=B-ra8veh4HE

                Comment

                • vdrokko99
                  Member
                  • Apr 2022
                  • 16
                  • Hungary
                  #5
                  pp5v_sus 5v
                  pp5v_s3 resistance to gnd is 40 kohm

                  but i dont find p5vs3_en in boardview. In schematic i found p5vs3_en on EN1 pin of U7201. in boardview name is pm_slp_s4_l.

                  pm_slp_s4_l 0V

                    Comment

                    • vdrokko99
                      Member
                      • Apr 2022
                      • 16
                      • Hungary
                      #6
                      Sorry, my bad. PP5v_SUS is 0v. I measured on wrong pad

                      also PM_SLP_SUS_L is 3.3V,
                      SMC_BATLOW_L is 0v

                        Comment

                        • mon2
                          Badcaps Legend
                          • Dec 2019
                          • 14028
                          • Canada
                          #7
                          SMC_BATLOW_L is 0v
                          Means your power adapter is underrated.

                          You may have a fake charger. This is a show stopper due to this logic level. Source / borrow the original Apple charger for testing.

                          See the flow chart here:

                          https://logi.wiki/index.php/G3_to_S3..._and_Broadwell

                          https://logi.wiki/index.php/PM_SLP_S...roubleshooting

                            Comment

                            • vdrokko99
                              Member
                              • Apr 2022
                              • 16
                              • Hungary
                              #8
                              Thank you for your help, ASAP i will buy an other charger, and i wil try with.

                                Comment

                                • vdrokko99
                                  Member
                                  • Apr 2022
                                  • 16
                                  • Hungary
                                  #9
                                  Originally posted by mon2

                                  Means your power adapter is underrated.

                                  You may have a fake charger. This is a show stopper due to this logic level. Source / borrow the original Apple charger for testing.

                                  Yes... I bought a faulty MBP 15 2010 with the original 85 watt charger. Aaaand. Using the original original charger, the board turned on

                                  But.. Of corse, AMD GPU is faulty, so now i ask for a permanent soulition.

                                  Thank You for help.

                                    Comment

                                    • mon2
                                      Badcaps Legend
                                      • Dec 2019
                                      • 14028
                                      • Canada
                                      #10
                                      https://forums.macrumors.com/threads...ypass.2134019/

                                        Comment

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