MacBook A1990 — No Display With Battery Connected

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  • mavaro
    Member
    • May 2017
    • 28
    • Polska
    #1

    MacBook A1990 — No Display With Battery Connected

    Hi, I have a problem with MACBOOK A1990 - The laptop starts with no image when the battery is connected, but without the battery it starts with an image - however, when using only the power supply, when logging into the system it turns off and resets again.

    Battery replaced with another unit → same problem.

    ISL9239 replaced → no change.

    SMBUS_BATT_SCL / SDA measure ~20-50kΩ to GND with battery disconnected (normal).

    Any ideas or advice would be a huge help!
    Thanks in advance for your time.​
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13829
      • Canada
      #2
      What is the voltage to ground of the following with the battery connected?

      SMBUS_3V3_BATT_SCL
      SMBUS_3V3_BATT_SDA

      PPBUS_G3H       with battery?

        Comment

        • mavaro
          Member
          • May 2017
          • 28
          • Polska
          #3
          I don't know how it happened, but it only works on battery. Maybe it required an SMC reset. After starting it up and entering passwords, it freezes and the touchbar doesn't light up.

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 13829
              • Canada
              #4
              Try a DFU.

                Comment

                • mavaro
                  Member
                  • May 2017
                  • 28
                  • Polska
                  #5
                  I don't have a second MacBook. Is there an option without additional hardware?

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 13829
                      • Canada
                      #6
                      Post # 2.

                        Comment

                        • mavaro
                          Member
                          • May 2017
                          • 28
                          • Polska
                          #7
                          Originally posted by mon2
                          Post # 2.
                          PPBUS_G3H - 12V

                          SMBUS_3V3_BATT_SCL - 3.3V
                          SMBUS_3V3_BATT_SDA                           - 3.3V

                          Macbook is behaving strangely. When it's hot, it starts up without a picture, but after a while it cools down, the picture appears - but when I try to log in, it hangs.

                            Comment

                            • mon2
                              Badcaps Legend
                              • Dec 2019
                              • 13829
                              • Canada
                              #8
                              Test with an external monitor. The SMBUS voltages are fine - they are not shorted.

                                Comment

                                • mavaro
                                  Member
                                  • May 2017
                                  • 28
                                  • Polska
                                  #9
                                  Originally posted by mon2
                                  Test with an external monitor. The SMBUS voltages are fine - they are not shorted.
                                  External monitor is working. Even though the battery is disconnected, the settings after starting show the information: battery fully charged and service recommended status.

                                    Comment

                                    • mon2
                                      Badcaps Legend
                                      • Dec 2019
                                      • 13829
                                      • Canada
                                      #10
                                      Backlight fault?

                                      Test with a torch / flashlight to the front face of the display. Display is defective? Was the unit dropped? Post pics.

                                      Does the caps lock led toggle ok?

                                        Comment

                                        • mavaro
                                          Member
                                          • May 2017
                                          • 28
                                          • Polska
                                          #11
                                          Originally posted by mon2
                                          Backlight fault?

                                          Test with a torch / flashlight to the front face of the display. Display is defective? Was the unit dropped? Post pics.

                                          Does the caps lock led toggle ok?
                                          The image works without the battery, with the battery too, but then the laptop hangs. Apple diagnostics hangs on error code: PFM006

                                            Comment

                                            • mon2
                                              Badcaps Legend
                                              • Dec 2019
                                              • 13829
                                              • Canada
                                              #12
                                              Run ASD for a deeper dive.

                                              https://boards.rossmanngroup.com/thr...nostics.12917/

                                                Comment

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