Macbook Pro a1502 no power

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  • harshana
    Badcaps Veteran
    • Aug 2022
    • 207
    • Sri Lanka

    #1

    Macbook Pro a1502 no power

    Laptop worked perfectly without any issue. suddenly it got stuck and died. I have no idea about the issue. I tried to troubleshoot the issue and I found below things.

    I can see 16.57v from magsafe adapter.
    I see 12.6v on L7130
    also 3.3v on L7560

    I can't see 5v. I guess thats the issue. but I can't see any short to ground on that coil. (tested at L7520)

    I guess 5v enable signals are missing. please help me to troubleshoot this.

    Here I attach the diagrams and brd files I used.
    Attached Files
  • dellxps15
    Badcaps Legend
    • Feb 2014
    • 1588
    • italy

    #2
    Re: Macbook Pro a1502 no power

    hi. check if j6100 has corrosion post voltage on c7505 pin 1, u6100 voltage, u1950 voltage and check if l7520 is pulsing 5 volt.

    green light on magsafe right ?

    Comment

    • reformatt
      Badcaps Legend
      • Feb 2020
      • 1399
      • Australia

      #3
      Re: Macbook Pro a1502 no power

      This can be so many things. Can be a missing pre-requisite for PM_SLP_S4, or a short on a sub-rail after S4.

      The 820-4924 board I've found is pretty robust. It's often minor corrosion spots caused by insects (either dying and decomposing, or from their droppings). A close examination of the board looking for corrosion spots is often the first thing to do, especially around the top of the board near the CPU. Most issues are usually on the keyboard facing side BTW. You are looking for discoloured end caps of resistors/caps usually. Don't forget to look at the sides of IC's as well, especially U7200. I had one recently where CPU_PROCHOT_L pin had crap on it, and S4 wasn't asserted as a result.

      Comment

      • harshana
        Badcaps Veteran
        • Aug 2022
        • 207
        • Sri Lanka

        #4
        Re: Macbook Pro a1502 no power

        Originally posted by dellxps15
        hi. check if j6100 has corrosion post voltage on c7505 pin 1, u6100 voltage, u1950 voltage and check if l7520 is pulsing 5 volt.

        green light on magsafe right ?

        green light appears for few seconds and turn into orange. sometimes I can't see any light. (this can be charger issue. I had this issue for last few months)

        I can't see corrosion anywhere.

        No 5v pulse at L7520. will check other voltages and post soon.

        Comment

        • harshana
          Badcaps Veteran
          • Aug 2022
          • 207
          • Sri Lanka

          #5
          Re: Macbook Pro a1502 no power

          Originally posted by reformatt
          This can be so many things. Can be a missing pre-requisite for PM_SLP_S4, or a short on a sub-rail after S4.

          The 820-4924 board I've found is pretty robust. It's often minor corrosion spots caused by insects (either dying and decomposing, or from their droppings). A close examination of the board looking for corrosion spots is often the first thing to do, especially around the top of the board near the CPU. Most issues are usually on the keyboard facing side BTW. You are looking for discoloured end caps of resistors/caps usually. Don't forget to look at the sides of IC's as well, especially U7200. I had one recently where CPU_PROCHOT_L pin had crap on it, and S4 wasn't asserted as a result.

          I will have a look again.

          Comment

          • piernov
            Super Moderator
            • Jan 2016
            • 4435
            • France

            #6
            Re: Macbook Pro a1502 no power

            https://logi.wiki/index.php/User:Pie....2C_what_do.3F
            OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

            Comment

            • harshana
              Badcaps Veteran
              • Aug 2022
              • 207
              • Sri Lanka

              #7
              Re: Macbook Pro a1502 no power

              Originally posted by dellxps15
              hi. check if j6100 has corrosion post voltage on c7505 pin 1, u6100 voltage, u1950 voltage and check if l7520 is pulsing 5 volt.

              green light on magsafe right ?

              c7505 pin 1 --------> 5.03v
              u6100 pin 8 ---------> 3.35v
              u1950 pin 8 ---------> 3.44v
              l7520 --------> 0v

              Comment

              • harshana
                Badcaps Veteran
                • Aug 2022
                • 207
                • Sri Lanka

                #8
                Re: Macbook Pro a1502 no power

                When I read this article, I guess I must find another magsafe charger before make a decision. I can see batteries are getting fat. (but I can see 12.57v using batteries as well)

                what do you think? is that enough voltages I mentioned above replies to move forward or do I need to find another AC adapter???

                Comment

                • mon2
                  Badcaps Legend
                  • Dec 2019
                  • 13894
                  • Canada

                  #9
                  Re: Macbook Pro a1502 no power

                  I can see batteries are getting fat.
                  Not good - gases are expanding and will cause at least the casing to deform. Have seen it with clients in our shop. Also dangerous for the end user. This pack needs to be replaced.

                  See attached.

                  L7520 enables through voltage on pin #4 of U7501.

                  What is the voltage to ground of pin #4 on U7501 ?
                  Attached Files
                  Last edited by mon2; 12-14-2022, 11:54 AM.

                  Comment

                  • harshana
                    Badcaps Veteran
                    • Aug 2022
                    • 207
                    • Sri Lanka

                    #10
                    Re: Macbook Pro a1502 no power

                    Originally posted by mon2
                    Not good - gases are expanding and will cause at least the casing to deform. Have seen it with clients in our shop. Also dangerous for the end user. This pack needs to be replaced.

                    See attached.

                    L7520 enables through voltage on pin #4 of U7501.

                    What is the voltage to ground of pin #4 on U7501 ?
                    U7501 pin 4 -----> 0v

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 13894
                      • Canada

                      #11
                      Re: Macbook Pro a1502 no power

                      Review this webpage if PM_SLP_S4_L is LOW = 0v.

                      See case # 2 on this website.

                      https://www.it-tech.com.au/mac-q-a/pm-slp-s4-l-timing/

                      Do check the voltage to ground on both sides of R8179. Is it 0v on both sides?

                      Continue to update this thread.
                      Attached Files
                      Last edited by mon2; 12-15-2022, 11:02 AM.

                      Comment

                      • harshana
                        Badcaps Veteran
                        • Aug 2022
                        • 207
                        • Sri Lanka

                        #12
                        Re: Macbook Pro a1502 no power

                        Originally posted by mon2
                        Review this webpage if PM_SLP_S4_L is LOW = 0v.

                        See case # 2 on this website.

                        https://www.it-tech.com.au/mac-q-a/pm-slp-s4-l-timing/

                        Do check the voltage to ground on both sides of R8179. Is it 0v on both sides?

                        Continue to update this thread.
                        both sides on R8179 is 0v. means PM_SLP_S4_L = 0v

                        PPVRTC_G3H = 3.34v
                        RTC_RESET_L = 3.34v
                        PCH_SRTCRST_L = 3.34v
                        PCH_INTVRMEN_L = was unable to find a testpoint to test Low signal(PCH_INTVRMEN = 3.24v)
                        PCH_DSWVRMEN_L = can't find a testpoint to test Low(PCH_DSWVRMEN = 3.24v)
                        SYSCLK_CLK32K_RTCX1 = don't have an oscilloscope.
                        PP3V3_S5 = 3.34v
                        PM_DSW_PWRGD = 3.44v
                        PP3V3_SUS = 3.35v
                        PM_BATLOW_L = 0.03v
                        PM_RSMRST_L = 3.31v
                        PM_PWRBTN_L = 3.43v (batteries not connected)

                        Comment

                        • mon2
                          Badcaps Legend
                          • Dec 2019
                          • 13894
                          • Canada

                          #13
                          Re: Macbook Pro a1502 no power

                          BATLOW is often missing because of bad/incorrect charger....
                          Be sure your adapter is suitable.

                          Comment

                          • harshana
                            Badcaps Veteran
                            • Aug 2022
                            • 207
                            • Sri Lanka

                            #14
                            Re: Macbook Pro a1502 no power

                            Originally posted by mon2
                            Be sure your adapter is suitable.
                            I'm using my original charger. but well damaged. will try to find similar one and test.

                            Comment

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