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    a1466 no power

    i have a1466 no power
    PPBUS_G3H=8.56v
    P5VP3V3_VREG3=3.3v
    PP3V3_S5=0v
    PP5V_S5=0v
    SMC_RESET_L=3.3v
    PP3V42_G3H=3.42v
    SMC_ONOFF_L=3.3v
    SMC_BC_ACOK=3.3 v
    SMC_PM_G2_EN=0v it comes from smc is smc bad or not
    What inputs does smc need to generate SMC_PM_G2_EN anyone help

    #2
    https://logi.wiki/index.php/G3_to_S3..._and_Broadwell

    Check the operation of the local xtal of the SMC.

    Click image for larger version

Name:	xtal.png
Views:	126
Size:	39.9 KB
ID:	3465155
    Last edited by mon2; 09-20-2024, 05:28 AM.

    Comment


      #3
      Originally posted by mon2 View Post
      https://logi.wiki/index.php/G3_to_S3..._and_Broadwell

      Check the operation of the local xtal of the SMC.

      Click image for larger version

Name:	xtal.png
Views:	126
Size:	39.9 KB
ID:	3465155
      Y1950=12MHZ
      Y5110=NOTHING IF I PRESS SMC 12MHZ GENERATED BUT NO POWER

      Comment


        #4
        Wait on other comments but you may need to flux and reflow the SMC chip. I recall having to do the same a few years ago.

        MacBook Air A1466 " 820-00165 " No Power Repairs (SMC REFLOW) (youtube.com)

        Comment


          #5
          Originally posted by mon2 View Post
          Wait on other comments but you may need to flux and reflow the SMC chip. I recall having to do the same a few years ago.

          MacBook Air A1466 " 820-00165 " No Power Repairs (SMC REFLOW) (youtube.com)
          thanks i try

          Comment


            #6
            Originally posted by mon2 View Post
            Wait on other comments but you may need to flux and reflow the SMC chip. I recall having to do the same a few years ago.

            MacBook Air A1466 " 820-00165 " No Power Repairs (SMC REFLOW) (youtube.com)
            I REFLOWED THE SMC AND SMC_PM_G2_EN=3.3V AND PP3V3_S5=3V BUT P5VS4RS3_EN IS MISSING AND PM_SLP_S4_L IS ALSO MISSING

            Comment


              #7
              Review the flow chart to study the conditions required for PM_SLP_S4_L.

              P5VS4RS3_EN comes out from S4_PWR_EN & PM_SLP_S4_L

              Comment


                #8
                Make sure you are using a genuine charger first for PM_SLP_S4 issues, as knock offs do not trigger PM_BATLOW_L high unless a battery is connected.

                All SMC related faults you check for corroded caps around the SMC itself and check PP3V3_S5_AVREF_SMC and PP1V2_S5_SMC_VDDC are both present. Sometimes SMC's need reballing, especially if there is corrosion pn the pads or the SMC itself.

                Comment


                  #9
                  Originally posted by reformatt View Post
                  Make sure you are using a genuine charger first for PM_SLP_S4 issues, as knock offs do not trigger PM_BATLOW_L high unless a battery is connected.

                  All SMC related faults you check for corroded caps around the SMC itself and check PP3V3_S5_AVREF_SMC and PP1V2_S5_SMC_VDDC are both present. Sometimes SMC's need reballing, especially if there is corrosion pn the pads or the SMC itself.
                  i have a new smc but how to program this

                  Comment


                    #10
                    Originally posted by mon2 View Post
                    Review the flow chart to study the conditions required for PM_SLP_S4_L.

                    P5VS4RS3_EN comes out from S4_PWR_EN & PM_SLP_S4_L
                    I CHECKED 11+1 REQUIREMENT IS PERFECT BUT PM_SLP_S4_L IS MISSING

                    Comment


                      #11
                      Replacement SMC's must come from a donor board. They can't be programmed from blank unfortunately. There is a flashing tool to reprogram when using a SMC from a dissimilar board but the board must at least boot to run the tool.

                      Check you don't have a single or double pulse of voltages up to Vcore after initial power on. This is a common issue on 820-00165 boards.

                      Comment


                        #12
                        Originally posted by reformatt View Post
                        Replacement SMC's must come from a donor board. They can't be programmed from blank unfortunately. There is a flashing tool to reprogram when using a SMC from a dissimilar board but the board must at least boot to run the tool.

                        Check you don't have a single or double pulse of voltages up to Vcore after initial power on. This is a common issue on 820-00165 boards.
                        TOOL NAME AND HOW TO MAKE USE BOOTABLE

                        Comment


                          #13
                          https://github.com/MuertoGB/SMCTool

                          Board has to be bootable, so you need a SMC from 820-3437 board etc. Another user mentioned they were able to use a SMC from an A1502 board on an Air.

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