Announcement

Collapse
No announcement yet.

A1990 MacBook no power help

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

    A1990 MacBook no power help

    I have a a1990 2018 15 inch MacBook Pro that will not power on.
    I have replaced the pch bga chip because it was heating up under my thermal camera.
    I have replaced the battery, and replaced the small ic between the gpu and cpu as it had a direct short to ground.

    the MacBook now pulls 20v 2.4amps the trackpad clicks but it does not ever attempt to power on not even fan spin. After PCH replacement I was able to get it in dfu mode 1 time and restore bridge OS, but now the MacBook will no longer go into DFU mode.

    I have also noticed L7030 gets extremely hot yet there is no short to ground and it has 465ohms on both sides. I have also noticed that pp2v5 rail is missing and is showing 65 ohms on the rail. Not sure where to go from here if anyone has any suggestions.
    Tags: None
    #2
    20v 2.4amps
    Is this an immediate current consumption of 2.4A? Or does the current gradually climb up to this value? If it is an immediate current measurement of 2.4A then you have a short on the board.

    Comment

      #3
      It gradually climbs up, starting at .645 amps and then rising to 2.4.

      Comment

        #4
        Bump

        Comment

          #5
          What is the voltage to ground of ppbus_g3h?

          is the board power looping?

          Comment

            #6
            Originally posted by Cameron Kajohn View Post
            I have a a1990 2018 15 inch MacBook Pro that will not power on.
            I have replaced the pch bga chip because it was heating up under my thermal camera.
            I have replaced the battery, and replaced the small ic between the gpu and cpu as it had a direct short to ground.

            the MacBook now pulls 20v 2.4amps the trackpad clicks but it does not ever attempt to power on not even fan spin. After PCH replacement I was able to get it in dfu mode 1 time and restore bridge OS, but now the MacBook will no longer go into DFU mode.

            I have also noticed L7030 gets extremely hot yet there is no short to ground and it has 465ohms on both sides. I have also noticed that pp2v5 rail is missing and is showing 65 ohms on the rail. Not sure where to go from here if anyone has any suggestions.
            Can you indicate the motherboard number?
            820-01041-A or 820-01814-A?

            Comment

            Previous template Next
            Working...