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Macbook Pro 15" 820-2850-A No Power

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    Macbook Pro 15" 820-2850-A No Power

    Symptom: Plug in DC magsafe showing green light and change to orange colour for battery charging. In this case, unit unable to power on when power button has been press. No fan spinning, no start up sound.

    Step debug as below:-
    1. Unit still unable to power on via power pad.
    2. Failure remain the same after SMC reset.
    3. Power Rails measure as below with only adaptor plug in (no Battery):-
    > PPBUS_G3H -- 12.57v
    > PPBUS_CPU_IMVP_ISNS -- 11.58v
    > PPDCIN_G3H -- 16.5v
    > PP3V42_G3H -- 3.42v
    > PP3V3_S5 -- 3.32v
    4. Others power rails no voltage.

    #2
    Re: Macbook Pro 15" 820-2850-A No Power

    History of the machine? Known good 85W Magsafe?

    Originally posted by Terence Ng View Post
    > PPBUS_G3H -- 12.57v
    > PPBUS_CPU_IMVP_ISNS -- 11.58v
    Are you sure about this?
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

    Comment


      #3
      Re: Macbook Pro 15" 820-2850-A No Power

      Is Known good 85W Magsafe, battery is charging when plug in.

      Comment


        #4
        Re: Macbook Pro 15" 820-2850-A No Power

        Voltage measure with only battery condition:-
        > PPBUS_G3H -- 12.57v
        > PPBUS_CPU_IMVP_ISNS -- 11.58v
        > PPDCIN_G3H -- 0v
        > PP3V42_G3H -- 3.42v
        > PP3V3_S5 -- 3.32v
        > Others power rails no voltage.

        Comment


          #5
          Re: Macbook Pro 15" 820-2850-A No Power

          Do all fuses pass a continuity check?

          Comment


            #6
            Re: Macbook Pro 15" 820-2850-A No Power

            pp1v05_s5_mcp volt ?

            Comment


              #7
              Re: Macbook Pro 15" 820-2850-A No Power

              PP1V05_S5_MCP doesn't exist on 820-2850. It's a 2010 model, there's no MCP.
              OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

              Comment


                #8
                Re: Macbook Pro 15" 820-2850-A No Power

                Originally posted by cyclones View Post
                Do all fuses pass a continuity check?
                ---Yes, fuse in good conditions

                Comment


                  #9
                  Re: Macbook Pro 15" 820-2850-A No Power

                  Latest measurement, Power Rails measure as below with only adaptor plug in (no Battery):-
                  > PPBUS_G3H -- 12.57v
                  > PPBUS_CPU_IMVP_ISNS -- 11.58v
                  > PPDCIN_G3H -- 16.5v
                  > PP3V42_G3H -- 3.42v
                  > PP3V3_S5 -- 3.32v
                  > PP3V_S3 -- 3.32v
                  > PP3V_S0 -- 3.30v
                  > PP5V_S5 -- 5v
                  > PP5V_S3 -- 5V
                  > PP5V_S0 -- 5V
                  > PP1V05_S0 -- 0V
                  -- CPUVTTS0_EN -- 3.3v
                  > ALL_SYS_PWRGD -- 0v
                  Observation:
                  1. All_SYS_PWRGD should be 3.3v for system to boot up but in this case is 0V
                  2. Suspect U7600 (ISL95870) faulty, try change but failure remain the same.

                  Comment


                    #10
                    Re: Macbook Pro 15" 820-2850-A No Power

                    Macbook Pro i5 820-2850-A (2.4G)
                    Hi, i bought a defect motherboard and i'm not sure that the following components must be on the motherboard ? C5369 R5371 C5318 U5313 U5323 U5101 C5101 U3301 C3302 U3300 R3940 ? Can somebody help me ?

                    Comment


                      #11
                      Re: Macbook Pro 15" 820-2850-A No Power

                      C5369 - No Mounted
                      R5371 - No Mounted
                      C5318 - No Mounted
                      U5313 - No Mounted
                      U5323 - No Mounted
                      U5101 - No Mounted
                      C5101 - No Mounted
                      U3301 - No Mounted
                      C3302 - No Mounted
                      U3300 - No Mounted
                      R3940 - No Mounted

                      Comment


                        #12
                        Re: Macbook Pro 15" 820-2850-A No Power

                        thx Terence

                        Comment

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