820-01041 cycling

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • iMuhtaseb
    Senior Member
    • Jan 2017
    • 125
    • Palesine
    #1

    820-01041 cycling

    Hello everybody and I hope you all doing well!

    I have a 820-01041 on me that shows the Apple logo for a second and it shuts off immediately.. I cannot boot into recovery OS even.

    When I turn on and hold the alt key it remains on forever, when its asked to into Macintosh HD it shuts down again.

    T2 revive was attempted and did not help (restore didn't work).

    The computer turns on taking 20V with up to 1.2A for a couple of minutes then drops to 0.02A and again..

    This is a weird one because no prior liquid damage or corrosion anywhere.. the computer is just squeaky clean.

    I'm suspecting a bad T2 chip but I wanted some advice and to be honest I don't know where to start with this one!

    I appreciate every help!

    Thanks
    Tags: None
    • piernov
      Super Moderator
      • Jan 2016
      • 4439
      • France
      #2
      Re: 820-01041 cycling

      I don't know for this one exactly, but some newer boards with dGPU require a known good battery to boot fully into macOS.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

        Previous template Next

        Related Topics

        Collapse
        • high-tech
          Samsung UN55F7050AFXZA ver. TD01 power cycling
          by high-tech
          Hello everybody, I could use some help on this one... It's got me guessing...
          I took pictures of all the boards and the pin out of the connector on the power supply that goes to the main board... I measured all the pins in relation to chassis ground, here are the result.

          (B13v)1. 12.7 volts cycling (Vamp) 2. 12.7 volts cycling
          (B13v)3. 12.7 volts cycling (PWM5) 4. 1.0 volts cycling
          (OD_LE)5. 2.8 volts cycling (PWM4) 6. 0.9 volts cycling
          (OD_ON)7. 2.8 volts cycling (PWM3) 8. 0.9 volts cycling
          9. ground (PWM2) 10. 0.9 volts cycling...
          09-15-2020, 03:39 PM
        • usbdevice
          Acer X223HQ (Version Bbd) on/off-power-cycling
          by usbdevice
          Hi all

          There's two other threads about this monitor with seemingly the same problem. The problem was resolved in one case by replacing the entire PSU board and in the second one by replacing an unknown IC.

          https://www.badcaps.net/forum/showthread.php?t=50657
          https://www.badcaps.net/forum/showthread.php?t=40512

          The first one has pictures of the pcbs and I noticed that there's one IC and assorted caps not populated on mine (but the PCB itself looks identical) so I thought that'd warrant a new thread.

          It's my dad's old monitor. He...
          08-05-2022, 02:21 AM
        • huzo
          HP Omen shuts down when loading OS
          by huzo
          The model is 15ec-1061nm
          Board number is DAG3EDMB8D0​

          SO i turn the laptop on , and as soon as it starts booting from disk, from usb, windows,linux,HBCD,anything i boot it just turns off....while in bios menu or in linux boot menu it stays on normally...It's like when it starts to use graphics it shuts down...But i measured 0.72V while working on the GPU power line,no excess heat is comming from GPU or CPU, i even removed the heatsink and turned the laptop on and everything worked fine, got a bit hot, fan span to full speed, but it worked like that for few minutes in bios...
          10-29-2024, 12:05 AM
        • iMuhtaseb
          A2279 - 820-02841 cycling
          by iMuhtaseb
          A2279 (14" M2 Pro | 820-02841)
          No power - switches to 20V for a swift moment then starts cycling/switching on all USB-C ports.

          Board is clean.. I looked over it three times and found little corroded caps for a display data lines.. replaced them and they have nothing to do with the issue.

          Customer is using a branded USB-C to MagSafe cable. I looked for shorts (diode mode) nearly all lines, PPBUS, 3v8_AON, 5V_S2, 1v2_S2, 1v2_AWAKE, 1v8_AON.. and coils around master PMIC and slave PMIC; all reads normal.
          I suspected that ISL might be bad, took an educated...
          09-23-2025, 06:58 AM
        • brav1ez
          ASUS FX505GD shuts off after POST — no BIOS, power button unresponsive
          by brav1ez
          Hello everyone,
          I have an ASUS TUF Gaming FX505GD that's powering on, showing the ASUS logo for about 2 seconds with keyboard backlight, then immediately shuts off. After it shuts down, the power button does nothing until I unplug the laptop completely. No fans spin afterward either.

          I’ve tried:
          - CMOS reset
          - Removing the SSD/HDD
          - Reseating RAM (removing each stick individually stops boot completely)
          - Cleaning up recently applied thermal paste around CPU/GPU and nearby VRM components (issue persists)

          With...
          09-07-2025, 10:47 AM
        • Loading...
        • No more items.
        Working...