Macbook A1466 820-00165 will not turn on after shut down

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  • Instafixx
    Badcaps Veteran
    • Jul 2022
    • 374
    • India
    #1

    Macbook A1466 820-00165 will not turn on after shut down

    Namaste,

    I have a Macbook A1466 820-00165 which has come with erratic issues. it reboots. Trackpad doesnt work. Doesnt Turn on etc.

    Upon inspection
    Corrosion at the Trackpad - changed that to check.
    Some Keys including Power Key and Arrow Keys dont work on the keyboard.
    Wifi Stick Corroded - Changed to Check..

    Corrosion under U3540. Removed and Reballed.

    Now
    The Macbook turns on when plugged to the charger but if we shut it down, it wont turn on when charger connected. Have to remove and install the battery.

    The Backlight turns off randomly.

    Pin#2 of U3540 P3v3WLAN_VMON is showing 1.2V. It should show 3.3V right?

    Is it a SMC problem?
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14010
      • Canada
      #2
      Re: Macbook A1466 820-00165 will not turn on after shut down

      Remove the battery. Confirm the unit is stable with only the adapter.

      Original power adapter? Magsafe led lights?

      Confirm the 3v42 and ppbus_g3h power rails to ground voltage readings.

      If 3v42 is missing, check the voltage to ground of each pin of the dual diode that feeds this regulator.

      Post each measurement.

      If the unit does not power on / off after unit is off, then the keyboard power button is likely not working. Check the schematics to locate the smd pads that allow a tweezer to act like a pushbutton switch for the power. Try with tweezers. One pair of pads on each side of the PCB.

      If that works to turn it on or off, test again with a voltage check of the meter. Press the keyboard button and this smd pad should go low. Suspecting your keyboard and or keyboard cable needs to be replaced due to liquid damage. Find a YouTube video on this process. Believe the keyboard is riveted so it is not a simple job. Otherwise buy a complete keyboard and enclosure assembly.

      Regardless, you are faced with a mix of issues so each needs to be tackled.

        Comment

        • piernov
          Super Moderator
          • Jan 2016
          • 4435
          • France
          #3
          Re: Macbook A1466 820-00165 will not turn on after shut down

          Originally posted by Instafixx
          Some Keys including Power Key and Arrow Keys dont work on the keyboard.
          ?
          OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

            Comment

            • Instafixx
              Badcaps Veteran
              • Jul 2022
              • 374
              • India
              #4
              Re: Macbook A1466 820-00165 will not turn on after shut down

              Cleaned the board with an UltraSonic Cleaner. Now the backlight issue is stable.

              Replacing the keyboard - now it switches on by pressing the on/off key.


              SOLVED

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