MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

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  • slimmy182
    Senior Member
    • Apr 2021
    • 105
    • italy

    #1

    MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

    Hello out there.

    I purchased this mac MacBook Pro 13'' M2 chip, model A2338, logic board number 820-02773 as partially working. Seller give me an apple report saying: "Liquid spill on trackpad flat, BMU battery flat and logic board. Macbook starts only when connected to DC IN and show intermittent shoutdown".

    Now that I got it is does not start at all, Amp mether shows 5V 0A on both usb-c.

    Tearing down the logic board I can confirm there was liquid spill on the battery connector area and the battery flat. Liquid spill also on the trackpad connector and small amount on the antenna wifi connectors. I guess there was also a little moisture on the Q5800 side (referring to 820-02020 board view as 820-02773 is not present at this time).

    The back side of the board is pretty clean, no sings of corrosion or cleaning.

    The fact is that this moderboard was already cleaned from moisture, so I need to better check everything under microscope. Futhermore it seems to me that i'm hearing the famous clicking sound also in that board. But no components it's getting hot when plugged in.

    I would be glad if somenone more skilled that me will help me troubleshotting this Mac to have it finally working. That would be really appreciated.
    What I can start testing with my multimeter?
  • mon2
    Badcaps Legend
    • Dec 2019
    • 14011
    • Canada

    #2
    Re: MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

    Since the current draw is @ 0v and stuck @ 5v, start with a review of the USB Type C controllers (aka ACE controllers).

    See attached.

    Remove all power. Meter in resistance mode. Check the resistance across the white body parts = fuses.

    Post your measurements.
    Attached Files

    Comment

    • slimmy182
      Senior Member
      • Apr 2021
      • 105
      • italy

      #3
      Re: MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

      Originally posted by mon2
      Since the current draw is @ 0v and stuck @ 5v, start with a review of the USB Type C controllers (aka ACE controllers).
      Many Thanks mon2!!

      Cheking the two fuses nearby ACE controllers i've got continuity (no resistance)

      Upon connecting to DC IN i've got 5.17V on both side of each one.

      I also took those measurement (please mind that I'm using 820-02020 brd as reference):


      voltage on PPBUS_AON on FP800
      1 PPBUS_AON 12.3V
      2 PPVIN_LCDBKLT_F 12.3V

      voltage on PP3v8_AON
      L5800
      1 P3V8AON_VSW1 3.78V
      2 PP3V8AON_PH1 3.78V

      PP3v3_S2 voltage
      LC710
      1 P3V3S2_SW 0V
      2 PP3V3_S2 0V

      CD3217 support voltages

      RP844
      1 PP5V_S2 0V
      2 PP5V_BKLT_D 0V

      PP3v3_S2_UPC NOT ABLE TO LOCATE

      C5320
      1 PP1V25_S2 0V
      2 GND

      PPDCIN_AON_CHGR_R
      C520C
      1 PPDCIN_AON_CHGR_R 5.17V
      2 GND



      series of current sensing resistors
      R5221 — 1.4 Ω

      R5222 — 1.4 Ω

      R5261 — 1.4 Ω

      R5262 — 1.4 Ω

      Upon investigating board on microscope I found this spot of corrosion, see attached. Mainly around JT200, Q5840, C5800, UD560 areas.
      Attached Files
      Last edited by SMDFlea; 05-16-2023, 05:14 AM. Reason: added external images to badcaps

      Comment

      • slimmy182
        Senior Member
        • Apr 2021
        • 105
        • italy

        #4
        Re: MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

        Any of these part w moisture could be related to the problem?

        Comment

        • mon2
          Badcaps Legend
          • Dec 2019
          • 14011
          • Canada

          #5
          Re: MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

          Perhaps. Pour alcohol (IPA) and see if these sites can be cleaned up.

          Comment

          • slimmy182
            Senior Member
            • Apr 2021
            • 105
            • italy

            #6
            Re: MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

            I guess the voltage of each LDO rail is present on each of the CD3217 devices.
            Attached Files
            Last edited by SMDFlea; 05-16-2023, 05:14 AM. Reason: added external images to badcaps

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 14011
              • Canada

              #7
              Re: MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

              I think you are missing to check one more LDO rail at 1v1? Review the schematic. Not at my desk. It is the rail used for the bmc communication over the CCx lines.

              Comment

              • slimmy182
                Senior Member
                • Apr 2021
                • 105
                • italy

                #8
                Re: MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

                Originally posted by mon2
                i think you are missing to check one more ldo rail at 1v1? Review the schematic. Not at my desk. It is the rail used for the bmc communication over the ccx lines.
                cant find

                those are the one I guess cheked

                1 PP3V3_UPC0_LDO
                2 GND

                CF405
                1 PP1V5_UPC0_LDO_CORE
                2 GND

                CF508
                1 PP3V3_UPC1_LDO
                2 GND

                CF505
                1 PP1V5_UPC1_LDO_CORE
                Last edited by slimmy182; 04-17-2023, 12:42 PM.

                Comment

                • slimmy182
                  Senior Member
                  • Apr 2021
                  • 105
                  • italy

                  #9
                  Re: MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

                  Ok, damn, upon checking voltages in renases chip area I deadly short the IC. Now the board is taking 5.16V and 0.43A, consuming 2.2W. That chip is pretty hot. Any advice how to find a replacement?
                  That would be different from RAA225501A A2338 2020 logic board I guess.

                  Mine is 501CR17 H150EDN 19054131, the other is 501CR0B.

                  damn damn damn damn
                  Attached Files
                  Last edited by SMDFlea; 05-16-2023, 05:15 AM. Reason: added external images to badcaps

                  Comment

                  • mon2
                    Badcaps Legend
                    • Dec 2019
                    • 14011
                    • Canada

                    #10
                    Re: MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

                    Check the resistance to ground at the output of this regulator.

                    Post the measurement. If the resistance is low (and futile) then that explains why it is heating up.

                    Comment

                    • slimmy182
                      Senior Member
                      • Apr 2021
                      • 105
                      • italy

                      #11
                      Re: MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

                      Originally posted by mon2
                      Check the resistance to ground at the output of this regulator.
                      Could you please help me locate the output?

                      Comment

                      • mon2
                        Badcaps Legend
                        • Dec 2019
                        • 14011
                        • Canada

                        #12
                        Re: MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

                        Ok - found it - it is U5700.

                        All output pins need to be checked for their resistance to ground. Remove all power.

                        Measure for example,

                        pin #7 (LDO5)
                        pin #5 (PVCC)
                        pin #3 (UGATE1)

                        etc. - review the direction of the arrows on this component's library symbol in the schematic and measure each such pin to see if there is an excessive load.
                        Last edited by mon2; 04-18-2023, 08:41 AM.

                        Comment

                        • slimmy182
                          Senior Member
                          • Apr 2021
                          • 105
                          • italy

                          #13
                          Re: MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

                          Thank you so much for helping me.

                          U5700

                          5 P3V8AON_PVCC 5.2Ω

                          7 PP5V_AON 4.4Ω

                          Are pretty shorted. I'm facing difficult on measuring other IC output.

                          I found that A2338 M1 2020 820-02020 and A2338 M2 2022 820-02773 seems to share same U5700.

                          It isn't?

                          M2 and M1 images
                          .
                          Attached Files
                          Last edited by SMDFlea; 05-16-2023, 05:17 AM. Reason: added external images to badcaps

                          Comment

                          • slimmy182
                            Senior Member
                            • Apr 2021
                            • 105
                            • italy

                            #14
                            Re: MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

                            Originally posted by mon2
                            Ok - found it - it is U5700.

                            All output pins need to be checked for their resistance to ground. Remove all power.

                            Measure for example,

                            pin #7 (LDO5)
                            pin #5 (PVCC)
                            pin #3 (UGATE1)

                            etc. - review the direction of the arrows on this component's library symbol in the schematic and measure each such pin to see if there is an excessive load.
                            U5700 replaced, now got 3.77V on P3V3AON. But the board is still taking 5.241V and 0A.

                            There is anything else I can check?

                            Comment

                            • mon2
                              Badcaps Legend
                              • Dec 2019
                              • 14011
                              • Canada

                              #15
                              Re: MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

                              The primary rail is the USB type c adapter voltage which by default will be 5 volts. After a proper handshake over the bmc interface (CCx lines), the adapter will kick into 20volts.

                              Surprised it is 0 A current draw as downstream rails use this 5volt rail.

                              Is the meter accurate? Is the type c meter bidirectional in support? We initially had a crappy one that was unidirectional only so it reported the wrong current consumption of 0 A always.

                              Check the fuses.

                              Next, check the LDO rails on each ACE controller. The rails confirm that the ACE controllers are ok. Each controller must be working else you will be stuck at 5 volts. Review the LDO rails in the schematic for each ACE controller.

                              Comment

                              • slimmy182
                                Senior Member
                                • Apr 2021
                                • 105
                                • italy

                                #16
                                Re: MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

                                Originally posted by mon2
                                The primary rail is the USB type c adapter voltage which by default will be 5 volts. After a proper handshake over the bmc interface (CCx lines), the adapter will kick into 20volts.

                                Surprised it is 0 A current draw as downstream rails use this 5volt rail.

                                Is the meter accurate? Is the type c meter bidirectional in support? We initially had a crappy one that was unidirectional only so it reported the wrong current consumption of 0 A always.

                                Check the fuses.

                                Next, check the LDO rails on each ACE controller. The rails confirm that the ACE controllers are ok. Each controller must be working else you will be stuck at 5 volts. Review the LDO rails in the schematic for each ACE controller.
                                As always, you were right. My type c meter is trusty, always use the same one and is bidirectional. Connecting to the transformer adapter side (not logic board side) I can detect 5.237V and 0.034A.
                                upon re-checking LDO rails and fuses for each ACE controller seems right. But I have not voltage on S2 rails.

                                Anyways I found schematis, boardview file and power supply diode mode reads pdf on famous chinese app. So from now my references are right for A2338 M2 820-02773 logic board.

                                PPDCIN_AON_CHGR_R 5V on both ports

                                LDO outputs

                                PP3V3_UPC1_LDO 3.44V
                                PP1V5_UPC1_LDO_CORE 1.58V

                                PP3V3_UPC0_LDO 3.44V
                                PP1V5_UPC0_LDO_CORE 1.58V

                                CD3217 support voltages

                                CC270
                                PP5V_S2 0V

                                RG2A0
                                1 PP3V3_S2_LDO 0V
                                2 PP3V3_UF790 0.34V

                                PP3V3_S2_USBLS1_ISNS 0V
                                PP3V3_S2_WLBT_ISNS 0V
                                PP1V25_S2 0V

                                RC714
                                P3V3S2_PWR_EN 0V
                                P3V3S2_EN 0V

                                PPBUS_AON_3V3S2_VIN_ISNS 12.30V

                                LC260
                                1 P5VS2TPS_PHASE 0V
                                2 PP5V_S2 0V



                                P5VS2_PWR_EN_RC 0V

                                I feel like UD600 could be damaged…

                                PP1V5_LDOINT_MPMU 1.48V

                                PP17V0_LDOIN 3.30V

                                Comment

                                • mon2
                                  Badcaps Legend
                                  • Dec 2019
                                  • 14011
                                  • Canada

                                  #17
                                  Re: MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

                                  PP3V3_UPC1_LDO 3.44V
                                  PP1V5_UPC1_LDO_CORE 1.58V

                                  PP3V3_UPC0_LDO 3.44V
                                  PP1V5_UPC0_LDO_CORE 1.58V
                                  To me, the PP3V3_UPCx_LDO rail outputs seem high. These should be close to 3v3 according to the schematics.

                                  For now, let us ignore this.

                                  Remove all power. Meter in resistance mode. Check the resistance to ground at each inductor / coil on the board. Each such coil is linked to a local buck regulator so we are checking to see if there is a low resistance on the respective power rail. Often linked to a shorted part; ideally a shorted cap.

                                  Comment

                                  • slimmy182
                                    Senior Member
                                    • Apr 2021
                                    • 105
                                    • italy

                                    #18
                                    Re: MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

                                    Originally posted by mon2
                                    Remove all power. Meter in resistance mode. Check the resistance to ground at each inductor / coil on the board. Each such coil is linked to a local buck regulator so we are checking to see if there is a low resistance on the respective power rail. Often linked to a shorted part; ideally a shorted cap.
                                    Thank you. Upon cheking, no low resistance found at each inductor / coil on the board.

                                    Comment

                                    • slimmy182
                                      Senior Member
                                      • Apr 2021
                                      • 105
                                      • italy

                                      #19
                                      Re: MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

                                      These are the measures I take in diode mode. Mine in red, black one as reference.

                                      I'm not able to find any problem by myself.
                                      Attached Files
                                      Last edited by SMDFlea; 05-16-2023, 05:19 AM. Reason: added external images to badcaps

                                      Comment

                                      • slimmy182
                                        Senior Member
                                        • Apr 2021
                                        • 105
                                        • italy

                                        #20
                                        Re: MacBook Pro 13'' M2 A2338 get 5V 0A does not boot. 820-02773

                                        Any hint would be really appreciated

                                        Comment

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