a2251 820-01949 - reboot issues

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Opunktvoll
    Member
    • Sep 2022
    • 22
    • Deutschland

    #1

    a2251 820-01949 - reboot issues

    Hi,


    acc. to owner the macbook suddenly died for no reason. 20V but no s5 state.
    Board looks clean, no damage at all. Thermal cam shows hot T2 and PMIC.

    After DFU restore it was working again, but I´m not able to install MacOS because it always reboots (most of the time it shuts off during recovery mode loading screen, sometimes I can get into recovery and even format SSD, but latest after trying to install MacOS it shuts off again). --> Screen turns black, fan blow at full speed for one second --> macbook reboots

    Any Ideas?

Related Topics

Collapse

  • duwane
    A2141 (2019 16" MB Pro) Strange macOS install issues. NAND? WIFI? FIRMWARE?
    by duwane
    Hi All.

    Sorry ahead of time for the text wall. This is a strange problem and I have tried to explain it as best I can. I realise this is a hardware forum (mostly), but I am still not sure if this is even a hardware fault! I am hoping that someone more knowledgeable than me in the area of understanding installation logs, or someone that has had a similar issue in the past may have some ideas of what might be causing this.

    The issue:
    Unable to do a clean install of any macOS versions supported for this model, even after fully erasing and formatting the internal SSD,...
    10-26-2022, 07:02 AM
  • Stachujones
    Mac Mini 2014 820-5509A Reboot loop while installing macOS
    by Stachujones
    Hello i have got a Mac Mini 2014 with 820-5509A motherboard it powers on but i cannot install macOS, in first part of installer it goes about 75% and reboots back again to installer
    I think the bios was changed because it has a lot of flux around EFi chip
    Thanks in advance
    06-09-2025, 08:34 AM
  • spice_disc
    Vizio TV M50-C1 reboot cycle and static on screen
    by spice_disc
    I'm currently trying to diagnose and fix my Vizio TV (Model M50-C1). I've tried a number of different basic solutions, but I'm trying to determine if my issue is currently a failing panel, T-Con board, or main board (or something else entirely) and whether or not it is worth my time to fix it. Details of the issue and what I've tried are below as well as why I think it is either a bad panel, T-Con board, or main board.

    The Issue: The TV will be on and working fine but after the TV is on for ~5-10 minutes the screen will freeze (with sound continuing) until the TV reboots itself. While...
    09-08-2024, 02:37 PM
  • SoulFreeze
    Audio Issues - Realtek ALC3306 - Lenovo Slim Pro 7 14ARP8 - Type 83AX
    by SoulFreeze
    Hi, trying to troubleshoot some problems with this laptop I just finished repairing which had power issues (Burnt Buck converter - SY8883DFC shorted to ground).

    After repairing the above issue, I realized the following remaining problem,
    Sound only comes from bottom speakers, top palmrest speakers don't work. Neither does the headphone jack (static/buzzing).
    The computer recognizes headphones are connected and displays a popup in windows
    Sometimes, the computer will boot up and the sound will be working fine. However, if I run intensive programs and the computer...
    06-21-2025, 09:53 AM
  • pumpkinpie132
    macOS recovery mode terminal commands
    by pumpkinpie132
    Hello guys!

    I am being employed at a company where macOS installations are common, and I was wondering if you guys had any tips or tricks to deploying hundreds of macs from recovery mode (we use macdeploystick)! If any of you guys have any cool keyboard shortcuts or commands to making macOS installations a bit faster or anything lol I would be glad to know!😀
    05-27-2025, 02:55 PM
  • Loading...
  • No more items.
Working...