a1989 820-00850 pp5v_g3s error

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • guruji
    Senior Member
    • Oct 2012
    • 118
    • India

    #1

    a1989 820-00850 pp5v_g3s error

    hello,
    I have this machine a1989 it has 20V ,also battery charges but does no come on.
    I have the following
    12.6v ok
    3.3v ok
    pmu 1.8v ok
    pmu 0.6v okay
    pmu 1.1v okay
    pmu 0.8v okay
    pp5V_G3H fluctuatin 2.1v to 4.8v not stable ,but also loaded with ext dc voltage.No shorts of anything wrong.
    also trakpad does not click.
    so in short my pp5_g3sh is not correct.
    any idea thanks.
  • mon2
    Badcaps Legend
    • Dec 2019
    • 13964
    • Canada

    #2
    Re: a1989 820-00850 pp5v_g3s error

    Remove all power. What is the resistance to ground of pp5v_g3s ?

    Comment

    Related Topics

    Collapse

    • gugutm
      a1989 820-00850 stuck at 5v 0.041a Help
      by gugutm
      Hello everyone,


      I'm new to the forum,sorry english is not my first language too, i got a basic plus knowledge, but now i am in this situation where i need some help , i spend good few days reading forums , here and outside , to help my problem solve, with no luck

      long story short, i bought macbook pro a1989 820-00850, clean no water damage which was stuck on 5v 0.200/300a i read a lot of forums what that could be , it indicated to faulty corrupted t2 rom

      of course before jumping to conclusion and connected to DFU , i believe i done basic checks...
      01-04-2025, 09:35 AM
    • obelix24
      A1989 - replace SSD
      by obelix24
      I have one A1989 that have not internal LCD (there was water damage on LCD connector) but macbook itself was working fine.
      After some time it stoped working and starts in Recovery mode. When i try to restore in DFU it always fails with error : AMRestoreErrorDomain error 75 - Failed to handle message type StatusMsg (Missing data volume))

      Is it possible to just swap SSD from some other macbook ? (or it have some dependecies ? A1989 only, some special possition from donor to correct possition on my macbook ? or i can take any SSD chips from any other macbook (with T2) and put...
      05-11-2025, 01:53 PM
    • ErinV
      MacBook Pro A1989 820-00850-A not powering on
      by ErinV
      Hey everyone!

      I have a MacBook Pro A1989 with a 820-00850-A board that recently stopped working. I used it overnight to charge my phone, in the morning it didn't turn on, I assumed flat battery but now won't charge and doesn't start at all.

      I have fully dissassembled it, when disconnected the battery reads at 0.012V. Even with the battery disconnected the laptop doesn't boot.

      The diode voltages around all 4 CD3215's seem fine.

      For all CD3215 (UB300, UB400, U3100 and U3200) I read just above 5V on PP20V_USBC_TA_VBUS, 3.3V on PP3V3UPC_TA_LDO, 1.8V...
      09-30-2024, 10:21 PM
    • Madoy104
      Macbook Pro A1989 - No image, working fine with external monitor
      by Madoy104
      Hi everyone,


      I have a MacBook Pro A1989 that was likely exposed to liquid. It doesn't display an image on the built-in screen, but the screen is backlit (you can't see the Apple logo or any other elements when held up to light). The laptop provides 20V and 1.5-2A, and it works fine when I use it with an external monitor. Currently, the connector for the display (J8500) is disconnected. I'm writing to ask for help in diagnosing the issue. I've heard that when the J8500 is exposed to liquid, the processor pin responsible for the display might short-circuit, and I'd like to know...
      08-15-2024, 10:01 AM
    • EvilSnowtech
      MacBook A1989 BT/WLAN Issue, Questions, or Replacement Requests
      by EvilSnowtech
      Hello members of the repair forum,

      I'm facing an issue with my MacBook A1989, where I encountered a short circuit on PP1V8_G3S for reasons unknown. After removing the audio amplifier and MIC, the resistance values returned to normal.

      However, during testing, I found that attempting to enable Bluetooth yields no response. Bluetooth cannot be activated, and the PP1V8_G3S-to-ground resistance value is approximately 285. I suspect that PP1V8_G3S_WLANBT_VDDIO may, under certain conditions, exceed 1.8v, potentially causing damage to the Bluetooth module. I am considering replacing...
      12-06-2023, 12:45 AM
    • Loading...
    • No more items.
    Working...