820-00165-A.. No Boot

Discussion in 'Computer Hardware Repair' started by Orb, Jun 9, 2019.

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  1. Orb

    Orb Well-Known Member

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    Hi guys.. I have a Macbook Air here with a no boot situation. Hope you guys can help. I have tried shinning light on the display but can't see anything in regards to a logo or folder etc.

    What I can see..
    Firstly .. Light on charger is green initially then goes orange after about 2 seconds. The fan does start normally but then spins up gradually faster and faster until full speed is attained and it just stays like that. CPU does get warm, approx 25°C

    I have tested these main rails which are present.. Although maybe I didn't test them in the correct location so I need help with that just in case... PPBUS_G3H, PP3V3, PP1v8, PP1v2, PP1v5, PP1v05.


    I did notice..
    I do not have any voltage 40v output on U7750 even though I do have 3.42v at SMC_LID .. ALthough I'm not sure if this should be present all the time.

    Some expert pointers would be appreciated

    Thank you
     
    #1 Orb, Jun 9, 2019
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  2. technical

    technical Moderator Staff Member

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    try one bios new before
     
    #2 technical, Jun 9, 2019
  3. Orb

    Orb Well-Known Member

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    How do i do that please? I've only got the logic board.
    EDIT.. I have full laptop now.

    If you mean just swap the BIOS chip.. I haven't got another one :(
     
    • Wow Wow x 1
    #3 Orb, Jun 9, 2019
    Last edited: Jun 9, 2019
  4. technical

    technical Moderator Staff Member

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    Are you not a technical and do not know BIOS programming?
     
    #4 technical, Jun 9, 2019
  5. Orb

    Orb Well-Known Member

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    If the BIOS code just comes straight off the chip with a programmer (like TL866II Plus) I can do that.. But I cannot manipulate the code itself.
     
    #5 Orb, Jun 9, 2019
  6. technical

    technical Moderator Staff Member

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    • Like Like x 1
    #6 technical, Jun 9, 2019
  7. Orb

    Orb Well-Known Member

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    So.. I can use my TL866II Plus to pull BIOS.. And use your supplied one to re-flash?
     
    #7 Orb, Jun 9, 2019
  8. technical

    technical Moderator Staff Member

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    yes
     
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    #8 technical, Jun 9, 2019
  9. Orb

    Orb Well-Known Member

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    The laptop does have a login password.. Will flashing BIOS affect this?
     
    #9 Orb, Jun 9, 2019
  10. technical

    technical Moderator Staff Member

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    no boot how you know have password ?
     
    #10 technical, Jun 9, 2019
  11. Orb

    Orb Well-Known Member

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    Yes it has a password, the customer (my brothers buddy) supplied it with their laptop on a sticker.

    I'm guessing flashing BIOS will erase it? If so can we just add his same password again?

    Also will his SSD data still be intact if it boots again?
     
    #11 Orb, Jun 9, 2019
  12. technical

    technical Moderator Staff Member

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    bios not related to ssd data
     
    #12 technical, Jun 9, 2019
  13. Orb

    Orb Well-Known Member

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    And what about password.. Can I just use the old (previous one) or do we have to create a new one, or just leave it blank etc?
     
    #13 Orb, Jun 9, 2019
  14. technical

    technical Moderator Staff Member

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    • Like Like x 1
    #14 technical, Jun 9, 2019
  15. Orb

    Orb Well-Known Member

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    Brilliant.. Thank you (y)
     
    #15 Orb, Jun 9, 2019
  16. Orb

    Orb Well-Known Member

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    #16 Orb, Jun 9, 2019
  17. technical

    technical Moderator Staff Member

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    why not ?
     
    #17 technical, Jun 9, 2019
  18. Orb

    Orb Well-Known Member

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    It was just a query really, as It doesn't really explain what I am buying.. It's my first time doing anything like this on a Macbook repair so I need all the advice I
    can get. You have to start somewhere right.

    1 .As I already have the password.. are you implying that even with the Password it will still be encrypted in the BIOS file?
    2. Will the tool decrypt the password?
    3. Do I keep the tool once purchased?

    Thank you
     
    #18 Orb, Jun 9, 2019
  19. technical

    technical Moderator Staff Member

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    yes you can't understand because you ask too many questions.

    1. It is important that you know how to read and write the bios.
    send it to me, i will check and guide next

    Note: don't be greedy to ask too much.
     
    #19 technical, Jun 9, 2019
  20. Orb

    Orb Well-Known Member

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    No problem
     
    #20 Orb, Jun 9, 2019
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