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MacBook Pro Retina Late 2013 shows light, fan spin but no chime

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    MacBook Pro Retina Late 2013 shows light, fan spin but no chime

    Hi all,

    I have a MacBook Pro Late 2013 Retina.

    When plugged in, it shows an orange light on the charger (without battery connected) and the fans spin. But after about 15 seconds they stop and then never spin up again. No chimes and nothing on the display.

    There is impact damage to the corners of the casing and one of the USB ports is therefore warped. But the logic board itself looks okay from visual inspection.

    PPBUS_G3H showing 12.58V at all times.

    Can anyone help?

    #2
    Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

    Remove all power. Meter in resistance mode.

    Check the resistance to ground of each pin on the battery connector.

    Post the readings and scale used on the meter.

    Comment


      #3
      Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

      Hi mon2,

      From left to right.

      Pin 1: 00.5 - 200 mode
      Pin 2: 00.4 - 200 mode
      Pin 3: 00.6 - 200 mode
      Pin 4: 00.5 - 200 mode
      Pin 5: 10.00 - 20k mode
      Pin 6: 85.8 - 200k mode
      Pin 7: 85.5 - 200k mode
      Pin 8: 1. - on all modes
      Pin 9: 1. - on all modes
      Pin 10: 1. - on all modes
      Pin 11: 1 - on all modes

      Comment


        #4
        Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

        Post the 820-xxxx logic board #.

        Comment


          #5
          Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

          Hi mon2,

          820-3787-A

          Comment


            #6
            Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

            Post the voltage readings of each battery pin (with the battery connected).
            Attached Files

            Comment


              #7
              Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

              Pin 1: 11.33V
              Pin 2: 11.33V
              Pin 3: 11.33V
              Pin 4: 11.33V
              Pin 5: ?
              Pin 6: ?
              Pin 7: 0.03V
              Pin 8: GND
              Pin 9: GND
              Pin 10: GND
              Pin 11: GND
              Pin 12: 11.33V
              Pin 13: 11.33V
              Pin 14: 11.33V
              Pin 15: 11.33V
              Pin 16: UNCONNECTED
              Pin 17: UNCONNECTED
              Pin 18: 0.03V
              Pin 19: GND
              Pin 20: GND
              Pin 21 GND
              Pin 22: GND
              Pin 23: UNCONNCTED
              Pin 24: UNCONNECTED

              Not sure how I do the others as the connector blocks the pins?

              Comment


                #8
                Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

                What are the voltage readings on pins 5 & 6 ?

                Comment


                  #9
                  Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

                  Hi mon2,

                  How can I measure these? The pins are covered by the connector with it plugged in.

                  Comment


                    #10
                    Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

                    Measure @ D7050 ESD diodes.

                    Comment


                      #11
                      Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

                      Hi mon2,

                      Pin 5: 3.40V changing to 3.33V every second.
                      Pin 6: 3.40V changing to 3.38V every second.

                      Comment


                        #12
                        Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

                        Voltages are good.

                        So the logic board is power cycling every second?

                        Comment


                          #13
                          Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

                          No that is just what I observed on reading.

                          What is happening is that board switches on with fan spin, fan spins for about 15 seconds and then shuts off. No chime or display.

                          Comment


                            #14
                            Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

                            Ok but after it shuts off, does it turn on again and repeat this on/off/on cycle?

                            Comment


                              #15
                              Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

                              No it stays off.

                              Comment


                                #16
                                Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

                                See here:

                                https://boards.rossmanngroup.com/thr...a-second.5583/

                                Comment


                                  #17
                                  Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

                                  But it is not a second it spins for @mon2, it is whole 15 seconds of fan spin! Then powers off!

                                  Comment


                                    #18
                                    Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

                                    Ok. Meter in DC volts scale.

                                    What are the voltage readings for the following ?

                                    SMBUS_SMC_0_S0_SCL
                                    SMBUS_SMC_0_S0_SDA

                                    Comment


                                      #19
                                      Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

                                      Apply lots of flux on U9300 = PPVCORE_S0_GFX_REG regulator.

                                      Reflow this component to fix up every solder joint on this component - there is a long history of faults linked to this device.
                                      Attached Files

                                      Comment


                                        #20
                                        Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

                                        SMBUS_SMC_0_S0_SCL: 3.32V going to 3.29V every second
                                        SMBUS_SMC_0_S0_SDA: 3.31V going to 3.28V every second

                                        Comment

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