820-00840-A No Boot

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Toxic9996
    Member
    • May 2022
    • 32
    • Romania

    #1

    820-00840-A No Boot

    hello, I need guidance, I have an 820-00840-A, all the power lines are correct less on PM_EN_P1V8S0 where I have 3.2v and CPUVR_PWM1 0.40v, the start sequence is 20v,560ma-5 sec 650ma, 20 sec 390ma remains for all time, do you have any idea what the problem could be, thank you
  • mon2
    Badcaps Legend
    • Dec 2019
    • 13850
    • Canada

    #2
    Re: 820-00840-A No Boot

    Check to see if you have PP5V_S5.

    Review the cases here - the one with 350mA current draw may be the same as yours.

    https://repair.wiki/w/A1708_2016,_20...ar_MacBook_Pro

    Comment

    • Toxic9996
      Member
      • May 2022
      • 32
      • Romania

      #3
      Re: 820-00840-A No Boot

      PP5V_S5 _5v

      Comment

      • Toxic9996
        Member
        • May 2022
        • 32
        • Romania

        #4
        Re: 820-00840-A No Boot

        no damege whater pcb in perfect condition

        Comment

        Related Topics

        Collapse

        • privato89
          Nintendo Switch Oled HEG-001: Second-Stage Boot Failure
          by privato89
          Hello everyone,

          I'm facing an issue with a HEG-001 motherboard that is unable to complete the Second-Stage Boot. I'd like to start directly with my conclusion, which is the decision to replace the MAX77621AEWI chip, and understand if it could be a correct evaluation.

          Before I dive into the process that led me to this decision, I want to mention that I have a fully equipped lab where I can perform any kind of tests.

          Let's begin:

          Following some guides online, I tried to understand how the Boot phase of the Nintendo Switch works, and what are the...
          03-26-2024, 06:37 AM
        • hinisa
          Xiaomi router freezes at boot after re-capping
          by hinisa
          I'm using Xiaomi Router 4A gigabit edition as wireless repeater. It worked fine for 2 years or so, but last week, wireless started to disappear.

          When I unplug/replug the power, it was working fine for a day/half a day or so until it freezes again.

          After testing with different power supply adapters and concluding it wasn't the issue I finally opened the case and this was the situation:



          Anyway I proceed to clean up the mess and replace all caps but unfortunately it made the situation worse. Now router can't even boot, either it freezes during...
          07-08-2023, 05:58 AM
        • Luke Anders
          Lenovo Legion 5 (15ACH6H/17ACH6H) - Does not boot into any OS
          by Luke Anders
          Hi everyone,

          A few details about the laptop itself:

          Name: Lenovo Legion 5
          Model: 15ACH6H (according to its back cover details) / 17ACH6H (according to the BIOS Menu)
          BIOS Version: GKCN60WW
          EC Version: GKEC65WW
          Serial Number: PF39AQ7Z
          Board Model: NM-D562 Rev 3.0
          RAM: 16GB Installed, DDR4 (brand new)
          NVME: 500GB NVME drive (brand new, installed Windows 10 onto it for testing purposes and tested on another laptop (a dell XPS) works perfectly fine and boots in)

          I bought this laptop recently from eBay as a faulty device....
          10-12-2024, 05:13 AM
        • NolesFan
          Samsung un82ru88000f - Boot loop sort of but can correct with taping of LVDS ribbon
          by NolesFan
          Hello all... TV started boot looping. Opened the back panel and tried to isolate the problem. Just PSB no boot loop. PSB and MB no boot loop. Plug in the LVDS from panel to MB and boot looping starts up. It doesnt matter of order that I plug the LVDS ribbons back in, only 1 and no boot loop but as soon as 2nd one plugs in boot looping. I then noticed a flicker on the screen when I was closing the clip on the harness to the LVDS. Shut the lights off so I can see better, and I noticed as i slowly close it, I will get a picture, but as soon as it clips in, I lose picture and booting happens. So I...
          10-24-2024, 06:36 PM
        • torchzack
          Samsung 55" TV - Boot loop but sometimes works fine - UE55MU6470U
          by torchzack
          Hi Team - just joined to see if anyone can offer some expertise in diagnosing an issue with a TV.

          I've done a few hours googling and youtubing but just seeing if anyone has any insight here. I got a 55" Samsung UE55MU6470U which seems to boot loop and then after 10 mins will boot, work for a few minutes, then turn off and repeat.

          Whilst it's on into the normal Samsung menu/boot screen it looks perfect - so I can't see there being any screen issues. I've seen lots of videos with taping across clock lines to diagnose which particular one may be an issue but i don't...
          08-28-2023, 07:42 AM
        • Loading...
        • No more items.
        Working...