A1706 - no brain after display replacement

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  • wnt2fx
    Member
    • May 2021
    • 24
    • Germany

    #1

    A1706 - no brain after display replacement

    A friend replaced the display on that machine and since then it is dead. He can not remember any mistake.

    cpu vcore present. no adaptive voltage. stable 1.8V I think. no chime, no mouse light, no brain. No short on pin 1 J8500 / EDP_INT_AUX_N

    All major voltages present and stable except P5VUSBC / PP5V_S4_T_USBC. I do not know what is for really. Can it be normal ?

    No difference on external display with internal disconnected.

    What way should I go ?

    best regards
  • Stephen
    Meow Meow MEOW!
    • Apr 2020
    • 667
    • United States

    #2
    Re: A1706 - no brain after display replacement

    i have noticed this happen before with a A1706 you gotta consider the fact the line on the LCD backlight is like very close to the line near the CPU if I was not mistaken...I think Louis Rossmann said this design was terrible because it could fry the CPU if putting the LCD on improperly. No idea to be honest but I am assuming that 50Volts was injected into the CPU line?
    sigpic
    MEOWING IN THE IMPOSSIBLE UNIVERSE!

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    • reformatt
      Badcaps Legend
      • Feb 2020
      • 1398
      • Australia

      #3
      Re: A1706 - no brain after display replacement

      Check the Touchbar connector for damage if a home handyman job. It's right next to one of the hinges. Rossman had a PSA about it a while back.

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