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MacBook A1425 (820-3462) No green light

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    MacBook A1425 (820-3462) No green light

    Received an MacBook A1425 with can't power on...No green/orange led light. Some measurement has been taken as below:-

    > SYS_ONEWIRE: ~3.4V
    > SMC_BC_ACOK_VCC : ~ 3.4V
    > ADAPTER_SENSE: ~3.4V
    > PPBUS_G3H : ~2V
    * No shorted to ground
    * Remove F7040 voltage remain the same ~2V
    > SMC_RESET_L : ~3.4V
    > PP3V42_G3H_CHGR: ~3.4V
    > PP5V1_CHGR_VDD,PP5V1_CHGR_VDDP: ~5.48V
    > CHGR_DCIN_D_R: ~16.5V
    > CHGR_AGATE: ~6.8V
    > CHGR_SGATE: ~16.2V
    > PPDCIN_G3H_INRUSH: ~16.4V

    Looks U7000 faulty.. need help to double confirm?

    #2
    Re: MacBook A1425 (820-3462) No green light

    Hi Terence.

    1) voltage @ PPDCIN_G3H_CHGR ?

    2) voltage @ CHGR_UGATE ?

    3) voltage @ CHGR_LGATE ?

    4) voltage @ CHGR_ACOK ?

    Comment


      #3
      Re: MacBook A1425 (820-3462) No green light

      1) voltage @ PPDCIN_G3H_CHGR ?
      >> 18.2V
      2) voltage @ CHGR_UGATE ?
      >> 0V
      3) voltage @ CHGR_LGATE ?
      >> 0V
      4) voltage @ CHGR_ACOK ?
      >> 3.4V
      Last edited by Terence Ng; 06-01-2021, 07:02 AM.

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        #4
        Re: MacBook A1425 (820-3462) No green light

        My bet is on a faulty U7000.

        Comment


          #5
          Re: MacBook A1425 (820-3462) No green light

          Hi...
          Noted with thanks...

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