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MacBook Air a1466 820-00165-a doesn’t start

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    #61
    Re: MacBook Air a1466 820-00165-a doesn't start

    PP3V42_G3H 3.4v
    SMC_BC_ACOK 3.3v
    PM_SLP_S5_L - is pulsing 1.2v
    PM_SLP_S4_L signal is plusing 1.2v cycling
    P3V3S3_EN signal is plusing 0.8v
    PP3V3_S3 signal is plusing
    P1V8S3_EN 0v
    PP1V8_S3 pulsing 0.8v
    P1V8S3_PGOOD is pulsing
    P5VS4RS3_PGOOD is pulsing
    P1V05S0_PGOOD is pulsing
    DDRREG_PGOOD 1.2v pulsing
    PP3V3_S0 pulsing

    Comment

      #62
      Re: MacBook Air a1466 820-00165-a doesn't start

      https://logi.wiki/index.php/820-00165_Pulsing

      Comment

        #63
        Re: MacBook Air a1466 820-00165-a doesn't start

        Originally posted by mon2 View Post
        https://logi.wiki/index.php/820-00165_Pulsing
        PLT_RESET_L 0v
        : R7121 & R7122 are 10.6 10.4 Ohms. No broken path. No short. R7152 0.4 and R7151 2.9 Ohms
        SMC_PBUS_VSENSE pulsing all pulse is 5 sec
        PPBUS_G3H 8.56v
        PPDCIN_G3H 15.96v stable
        S4_PWR_EN 0v

        SYSPWROK 0v

        Comment

          #64
          Re: MacBook Air a1466 820-00165-a doesn't start

          Originally posted by mon2 View Post
          https://logi.wiki/index.php/820-00165_Pulsing
          PPVCC_S0_CPU resistanec 8.1 ohms

          Comment

            #65
            Re: MacBook Air a1466 820-00165-a doesn't start

            Originally posted by mon2 View Post
            https://logi.wiki/index.php/820-00165_Pulsing
            PPVCC_S0_CPU resistanec 8.1 ohms

            Comment

              #66
              Re: MacBook Air a1466 820-00165-a doesn't start

              P5VS4RS3_EN IS 3.3V Check u8020 input PP3V3_S5 is 3.3V, ok. Check u8020 enable signal P3V3SUS_EN is 3.3V, ok.

              Is my u8020 is bad? https://www.it-tech.com.au/mac-q-a/pm-slp-s4-l-timing/ case study 3

              Comment

                #67
                Re: MacBook Air a1466 820-00165-a doesn't start

                Remove all power. Check and compare the resistance of R1275.

                Comment

                  #68
                  Re: MacBook Air a1466 820-00165-a doesn't start

                  Originally posted by mon2 View Post
                  Remove all power. Check and compare the resistance of R1275.
                  0hms pin 1 and pin 2
                  pin1 to gnd 166 ohms

                  Comment

                    #69
                    Re: MacBook Air a1466 820-00165-a doesn't start

                    Remove all power, meter in resistance mode.

                    Check the resistance to ground of PPBUS_G3H.

                    Is this rail pulsing when power is on?

                    If yes, remove the fuse on this rail. Leave the fuse off the board for now.

                    Then power up again and check the voltage on the fuse pad from the producer side = ISL side.

                    What is the voltage of PPBUS_G3H without the fuse (no load from the consumer side so the rail should not be pulsing). Confirm this.

                    Comment

                      #70
                      Re: MacBook Air a1466 820-00165-a doesn't start

                      Originally posted by mon2 View Post
                      Remove all power, meter in resistance mode.

                      Check the resistance to ground of PPBUS_G3H.

                      Is this rail pulsing when power is on?

                      If yes, remove the fuse on this rail. Leave the fuse off the board for now.

                      Then power up again and check the voltage on the fuse pad from the producer side = ISL side.

                      What is the voltage of PPBUS_G3H without the fuse (no load from the consumer side so the rail should not be pulsing). Confirm this.
                      3.3megaohms to gnd.
                      Its not pulsing sir


                      What is the voltage of PPBUS_G3H without the fuse (no load from the consumer side so the rail should not be pulsing). Confirm this.

                      PPVBAT_G3H_CHGR_REG 8.55v STABLE
                      PPBUS_G3H 1.0v
                      Last edited by kalilinux25; 04-03-2022, 07:18 PM.

                      Comment

                        #71
                        Re: MacBook Air a1466 820-00165-a doesn't start

                        PPBUS_G3H 1.0v
                        This is too low.

                        Remove all power -> remove fuse @ F7140.

                        Then power up -> check the voltage on F7140, pad # 1 (or L7130, pin #2).

                        What is the voltage now of PPBUS_G3H ?

                        If this voltage is still not correct, carefully measure the voltage on each pin of U7100. This ISL6259 is used to create the PPBUS_G3H rail. It may be defective but first let us check each pin for the proper voltage.

                        Post your measurements. Again, take your time and use good meter probes so that the ISL6259 is not shorted.

                        Comment

                          #72
                          Re: MacBook Air a1466 820-00165-a doesn't start

                          Originally posted by mon2 View Post
                          This is too low.

                          Remove all power -> remove fuse @ F7140.

                          Then power up -> check the voltage on F7140, pad # 1 (or L7130, pin #2).

                          What is the voltage now of PPBUS_G3H ?

                          If this voltage is still not correct, carefully measure the voltage on each pin of U7100. This ISL6259 is used to create the PPBUS_G3H rail. It may be defective but first let us check each pin for the proper voltage.

                          Post your measurements. Again, take your time and use good meter probes so that the ISL6259 is not shorted.
                          PPVBAT_G3H_CHGR_REG 8.55v STABLE pIN1

                          PPBUS_G3H 1.0v PIN2
                          this reading is I remve already the F7140 fuse

                          Comment

                            #73
                            Re: MacBook Air a1466 820-00165-a doesn't start

                            My bad...good!

                            Now if you solder back F7140 - does PPBUS_G3H remain stable or does it pulse or dip to another voltage value ?

                            Comment

                              #74
                              Re: MacBook Air a1466 820-00165-a doesn't start

                              If this voltage is still not correct, carefully measure the voltage on each pin of U7100. This ISL6259 is used to create the PPBUS_G3H rail. It may be defective but first let us check each pin for the proper voltage.

                              Post your measurements. Again, take your time and use good meter probes so that the ISL6259 is not shorted.

                              Do I need to solder back the fuse before testing the U7100 or just remve the fuse?

                              Comment

                                #75
                                Re: MacBook Air a1466 820-00165-a doesn't start

                                Originally posted by mon2 View Post
                                My bad...good!

                                Now if you solder back F7140 - does PPBUS_G3H remain stable or does it pulse or dip to another voltage value ?
                                If I solder back the Fuse 8.56 voltage is very stable. Confrim by my UNI-T multi tester also in the oscilloscope

                                Comment

                                  #76
                                  Re: MacBook Air a1466 820-00165-a doesn't start

                                  Sorry - we are out of sync. You have removed F7140 fuse and already confirmed that PPBUS_G3H voltage is OK. This is good.

                                  No need to test the voltages of U7100 for now.

                                  Now, solder back fuse F7140. Then measure the voltage of PPBUS_G3H again.

                                  We want to confirm that the voltage remains stable on F7140, pin # 2.

                                  Comment

                                    #77
                                    Re: MacBook Air a1466 820-00165-a doesn't start

                                    Originally posted by mon2 View Post
                                    Sorry - we are out of sync. You have removed F7140 fuse and already confirmed that PPBUS_G3H voltage is OK. This is good.

                                    No need to test the voltages of U7100 for now.

                                    Now, solder back fuse F7140. Then measure the voltage of PPBUS_G3H again.

                                    We want to confirm that the voltage remains stable on F7140, pin # 2.
                                    Nope..
                                    Reading without the fuse
                                    PPVBAT_G3H_CHGR_REG 8.55v STABLE
                                    PPBUS_G3H 1.0v

                                    reading with the fuse
                                    PPVBAT_G3H_CHGR_REG and PPBUS_G3H are stable 8.55v stable

                                    Comment

                                      #78
                                      Re: MacBook Air a1466 820-00165-a doesn't start

                                      Post the voltage readings of U6100 SPI flash rom.

                                      Comment

                                        #79
                                        Re: MacBook Air a1466 820-00165-a doesn't start

                                        Originally posted by mon2 View Post
                                        Post the voltage readings of U6100 SPI flash rom.
                                        U6100
                                        pin1- 0v
                                        pin2- 3.3v
                                        pin3 - 3.3v
                                        pin5- 3.3v pulsing to 2.0v
                                        pin6- 3.3v pulsing to 2.0v
                                        pin7 - 3.3v
                                        pin 8- 3.3v

                                        Comment

                                          #80
                                          Re: MacBook Air a1466 820-00165-a doesn't start

                                          Originally posted by mon2 View Post
                                          Post the voltage readings of U6100 SPI flash rom.
                                          Hope yiu can help me more sir

                                          Comment

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