Announcement

Collapse
No announcement yet.

Macbook Air 2018 A1932 Bootloop

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #1

    Macbook Air 2018 A1932 Bootloop

    Hi,

    I have a A1932 Macbook Air with Bootloop.

    I already replaced the battery with a new one and reset NVRAM and SNC.
    When I start the Macbook the Screen is coming on (no Logo) and switches of after a few seconds. If I start without the trackpad and keyboard it stays on longer.

    If I use diagnostic (Option+D), recovery (Option+R) I always get the Apple logo and it go into online-Recovery. Even if I boot the installer from a USB-stick it ends up in online-recovery. Sometimes it crashed short after entering the wifi password, sometimes it loads the recovery but when it finished it restarts again. see here: https://streamable.com/vef2f9
    I can´t get into DFU-Mode because it shut´s down before it enters the DFU state

    Other than the CPU the T2 chip get´s warm/not hot.

    Behavier is the same when I disconnect the power-button and display.
    Also no signs of damage or liquid on the board...

    Any ideas what I can check next?
    Tags: None
    #2
    1) Be sure the power adapter is beefy enough to power the unit. Suggest 100W USB Type C with a certified 100W rated cable.

    2) Use a USB Type C meter to gauge the voltage and current draw from this logic board. It helps to understand the condition of the board.

    3) Review the voltage to ground of PPBUS_G3H. Post the measurement. If this measurement is low, then remove all power and measure the RESISTANCE to ground of the same rail to check for a short.

    Comment

      #3
      1. Only have 65W charger, try to get a 100W tomorrow
      2. Please see the video. (Everything is attached, Battery, Touchpad...) https://streamable.com/949728
      3. Voltage in PPBUS_G3H is 12.25 - 12.70V during a boot cycle. Not sure what it should be...
      Click image for larger version Name: image.png Views: 0 Size: 283.3 KB ID: 3543408
      I also have diode readings, as seen in other threads
      Click image for larger version Name: image.png Views: 44 Size: 1.07 MB ID: 3543415
      thank you!

      Comment

        #4
        PPBUS_G3H is 12.25 - 12.70V
        It is in the proper range.

        https://logi.wiki/index.php/PPBus_G3H

        Do you hear a boot chime?

        Comment

          #5
          yes, everytime it starts up

          Comment

            #6
            Maybe the replacement battery is also bad?
            I get 1.2V (slowly dropping) on PPBUS_G3H when the charger is not plugged.

            Also I cannot start the Laptop when only the battery is plugged at first time. I need to connect the charger, than it powers on. After that I can unplug the charger and the laptop starts with battery.

            Comment

              #7
              Update: Get it into DFU mode now. Unfortunately there is Error 4005 and 4042 witch indicates a problem with the ssd

              Comment

              Previous template Next
              Working...
              X