820-00165-A.. No Boot

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

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  1. 41ifix

    41ifix Well-Known Member

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    Did you check logic board? These models usually end up with sulfate in components.
     
    #21 41ifix, Jun 10, 2019
  2. Orb

    Orb Well-Known Member

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    Hi E1LM..
    Yes, The pcb did have signs of minor liquid damage around U8130, U5110 & SPI header. I totally removed SPI header as it looked a bit rough, & re-flowed the ic's. Then checked the PCBs main rails which seemed ok. I could have missed something so
    suggestions are welcome, currently I am still waiting on some WSOP adaptor pcb's so that I can try checking/changing BIOS as advised by another member here..

    https://vinafix.com/threads/820-00165-a-no-boot.36605/#post-117219
     
    #22 Orb, Jun 10, 2019
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  3. 41ifix

    41ifix Well-Known Member

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    If you have sulfate, the problem is in logic board.
    Let's start in parts. Check me the integrated you say U5110, I think you erred.
     
    #23 41ifix, Jun 10, 2019
  4. Orb

    Orb Well-Known Member

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    Ok.. Thank you for assistance.
    U5110.. Pins..
    1 = 3.43v
    2 = 0v
    3 = 3.43
    4 = 2.8v
    5 = 3.40v .. This resets SMC.. PCB only restarts if power disconnected then reconnected.
    6 = 3.40v
    7 = 3.40v
    8 = 3.40v
     
    #24 Orb, Jun 10, 2019
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  5. 41ifix

    41ifix Well-Known Member

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    ..
    The measurements are correct in U5110.
    Now we need the measurements of U8130 and we are interested to know the measurements in coils L7560 and L7520.
    Did you check the other side of the plate? I need to know the status of U7501 and its measurements.
     
    #25 41ifix, Jun 10, 2019
  6. Orb

    Orb Well-Known Member

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    Ok here goes....

    U8130    ..
    1 = 3.32
    2 = 0v
    3 = 0.68v
    4 = 3.30
    5 = 0v
    6 = 3.3v

    L7560
    3.3v Both legs

    L7520
    5v Both legs

    U7501
    1 = 5.75v
    2 = 5.1v
    3 = 1.24v
    4 = 3.3v
    5 = 3.3v
    6 = 2v
    7 = 5.1v
    8 = 5.1v
    9 = 1v
    10 = 1.96v
    11 = 0v
    12 = 3.4v
    13 = 2v
    14 =5v
    15 = 1.96v
    16 = 1v
    17 = 3.3v
    18 = 3.3v
    19 = 2v
    20 = 3.4v
    21 = 3.4v
    22 = 3.3v
    23 = 8.58v
    24 = 3.78v
    25 = 3.3v
    26 = 8.4v
    27 = 0.7v
    28 = 0v
    29 = 5v
    30 = 0.35v
    31 = 10.1v
    32 = 5.08v
     
    #26 Orb, Jun 10, 2019
  7. 41ifix

    41ifix Well-Known Member

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    I check it and I tell him, I entertained myself with a repair haha
     
    #27 41ifix, Jun 10, 2019
  8. Orb

    Orb Well-Known Member

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    OK, thank you.
     
    #28 Orb, Jun 10, 2019
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  9. 41ifix

    41ifix Well-Known Member

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    The measurements are correct.
    I miss some doubts, did you try to turn on without any peripheral connected? Use joining R5115 (carries signal smc_onoff_L to GND)
    What charger are you using?
    Do you have the battery connected?
     
    #29 41ifix, Jun 10, 2019
  10. Orb

    Orb Well-Known Member

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    I have tried turning it on with the laptop fully assembled, also fully disassembled (just logic board & dc-in board with charger.) Also I have tried just logic
    board dc-in board with only battery connected.
    The charger is the original Apple one.

    I have also tried with bench PSU set to 15v and new Apple USB lead but same issue exists.

    Shorting R5115 just seems to shut down the board and start it up again.. but fan still spins up to full.
     
    #30 Orb, Jun 10, 2019
  11. 41ifix

    41ifix Well-Known Member

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    The fan without cable I / O, battery and trackpad will always revolutionize.
    When do you get a bio programmer?
     
    #31 41ifix, Jun 11, 2019
  12. Orb

    Orb Well-Known Member

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    The problem is... The fan starts slowly. But then gets faster until it reaches full speed, and it stays at full speed.

    I have programmers, I'm just waiting for some WSOP adapter boards to solder the bios chip on.

    Sent from my SM-G955F using Tapatalk
     
    #32 Orb, Jun 11, 2019
  13. 41ifix

    41ifix Well-Known Member

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    You can use 8 direct cables to the programmer. I already got impatient with this repair hahaha
     
    #33 41ifix, Jun 11, 2019
  14. Orb

    Orb Well-Known Member

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    I got impatient with it two days after it arrived here [emoji846]

    I am waiting for TSOP as don't like direct cable method.. Too much chance of error [emoji54]

    [emoji106]

    Sent from my SM-G955F using Tapatalk
     
    #34 Orb, Jun 11, 2019
  15. 41ifix

    41ifix Well-Known Member

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    Well let's hope it comes out repaired.
    We'll be waiting for that socket.
     
    #35 41ifix, Jun 11, 2019
  16. Orb

    Orb Well-Known Member

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    Got the socket E1LM... flashed the BIOS.. Even tried a new pre-programmed BIOS chip

    However no luck.. board still has the same issue.. Fan spin > Green light > then orange light > then fan starts spinning up higher and higher until full speed.

    Any other ideas please?
     
    #36 Orb, Jun 17, 2019
  17. 41ifix

    41ifix Well-Known Member

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    Look for a missing resistance or corroded rail with a microscope.
     
    #37 41ifix, Jun 18, 2019
  18. 41ifix

    41ifix Well-Known Member

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    Check U1950 integrated tracks
     
    #38 41ifix, Jun 19, 2019
  19. 41ifix

    41ifix Well-Known Member

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    Check track of U1950 pin 8.
     
    #39 41ifix, Jun 19, 2019
  20. Orb

    Orb Well-Known Member

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    U1950 tracks looks perfect.. Voltage on pin 8 is 3.43v


    Beginning to think perhaps dead CPU?
     
    #40 Orb, Jun 19, 2019
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