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macbook a1707 820-00928

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    macbook a1707 820-00928

    there is no reaction, it hangs at 20 V/0A. There was a little corrosion in the u7650 area. Replacing the u7000 did not help. Tell me, what else could it be? PPBUS_G3H=12.9V
    Flashing the bios with a clean region also did not work!
    Last edited by PITERPENY; 05-06-2024, 04:34 PM.

    #2
    From Rossmann forums:

    Post U7650 basic voltages: 23, 22, 12, 13, 29, 21.

    SMC_PM_G2_EN comes high?
    Are you using 87W charger?

    Comment


      #3


      Post U7650 basic voltages:
      23,=12.64V
      22,=3.3V
      12,=3.4V
      13,=1.99V
      29,=5V
      21.=3.4V

      SMC_PM_G2_EN comes high? = 3.4 V
      Are you using 87W charger? = used 100W

      Comment


        #4
        Try..

        "SMC bypass mode"
        Put SMC_ONOFF_L to ground, connect charger, maintain contact 5-10s; board should start when you release SMC_ONOFF_L.

        Remember to work with board alone, nothing connected apart of charger (no battery).

        Comment


          #5
          when connected to all 4 ports, the same behavior is 20V / 0A, the consumption of 0A is fixed, not the slightest consumption from the moment of connection.

          Comment


            #6
            Put SMC_ONOFF_L to ground, connect charger, maintain contact 5-10s; board should start when you release SMC_ONOFF_L.
            The power tester reboots and still no changes, I tried several times(
            Last edited by PITERPENY; 05-07-2024, 06:11 AM.

            Comment


              #7
              What is the voltage to ground of:

              PP3V3_S5
              PP5V_S4

              Comment


                #8

                PP3V3_S5=3.3v
                PP5V_S4= 0v

                Comment


                  #9
                  Remove all power -> meter in resistance mode -> measure the resistance to ground of PP5V_S4.

                  Also confirm, the voltage to ground of the EN1 signal @ P5VS4_EN_RCD. Carefully measure this at the IC.

                  What is the voltage to ground of ALL_SYS_PWRGD ?


                  Click image for larger version  Name:	A1707_power_sequence.png Views:	0 Size:	73.7 KB ID:	3266431
                  Last edited by mon2; 05-07-2024, 08:25 AM.

                  Comment


                    #10
                    PP5V_S4= 8,23 kOhm (0.390 diod mode)
                    P5VS4_EN_RCD =0V (46 kOhm)(0.457 diod mode)
                    ALL_SYS_PWRGD=0V(8.5 kOhm)(0.416 diod mode)

                    Comment


                      #11
                      With no power to the board, meter in resistance mode, measure the resistance to ground of each inductor (usually grey in color). Checking for shorts on the power rail.

                      Comment


                        #12
                        diod mode/resistance
                        L7030=0.413/43.6kohm
                        L7960=0.33/71.5ohm
                        L8000=0.18/52.9ohm
                        L8020=0.388/8.14kohm
                        L7900=0.215/0.695kohm
                        L7600=0.393/8.32kohm
                        L7660=0.252/2.030kohm
                        L8410=0.778/35.5kohm
                        LB700=0.230/1.697kohm
                        LA300=0.018/54.2ohm
                        LA350=0.013/40.3ohm
                        LA650=0.000/2.7ohm
                        LA640=0.000/2.7ohm
                        L7330=0.007/23.2ohm
                        L7231=0.000/4.2ohm
                        L7221=0.000/4.2ohm
                        L7211=0.000/4.2ohm
                        L7420=0.001/6.7ohm
                        L7410=0.001/6.7ohm
                        I don't find a short circuit, maybe the problem is in the SD3215?

                        Comment


                          #13
                          You have 20V so that implies that each CD3215 is operational. You can test by testing each USB Type C connector and also by rotating the USB C connector head by 180 degrees to confirm the operation of each side of the USB blade.

                          Check the voltage to ground of each pin of the main SPI flash ROM.

                          Comment


                            #14
                            U6100
                            1=1V
                            2=0.022V
                            3=0.027V
                            4=0
                            5=0
                            6=0.022V
                            7=0.020V(hesitate)
                            8=0.

                            all 8 sides of USB-C have the same readings
                            Last edited by PITERPENY; 05-07-2024, 01:54 PM.

                            Comment


                              #15
                              PP3V3_SUS=0V

                              Comment


                                #16
                                Check the resistance to ground of this missing power rail. No power during this resistance testing.

                                Comment


                                  #17
                                  PP3V3_SUS=0V .DIOD=0.320 .RESISTANS=2.8 kOhm

                                  Comment


                                    #18
                                    where is PP3V3_SUS formed?

                                    Comment


                                      #19
                                      See attached (U8200). Carefully review the voltage to ground of this critical load switch.

                                      PP3V3_S5 must enter this load switch

                                      EN signal of PM_SLP_SUS_L = '1' = ~3v3 then output will be the PP3V3_SUS to further power other devices.


                                      Click image for larger version

Name:	load_switch.png
Views:	58
Size:	47.0 KB
ID:	3266767

                                      Comment


                                        #20
                                        I removed f7000 and f7001 and my consumption is 20V but 0.000A is stable, I think the problem is in the power circuit and this is the CD3215. What do you think?

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