How to tell if the bios file is corrupted on the MacBooks

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  • mnciks11
    Badcaps Veteran
    • Aug 2019
    • 345
    • south Africa

    #1

    How to tell if the bios file is corrupted on the MacBooks

    Hello guys

    How to tell on MacBook if the bios is corrupted or not, on windows laptop I observe the behavior, measure the bios, usually windows laptops they will turn on and have nothing on the screen, the fan will usually spin one way and none stop, and more signs and measurements

    But with MacBooks im clueless, will you get a chime sound if the bios is corrupted, I don't think so anyway, be kindly share your views

    I have an 820-000165 machine, turns on, doesn't chime, the screen turns on but nothing on the screen, i have 1.8v on the cpu, i have checked the board, but judging by the behavior, what can be missing, is it bios?
  • mnciks11
    Badcaps Veteran
    • Aug 2019
    • 345
    • south Africa

    #2
    Re: How to tell if the bios file is corrupted on the MacBooks

    I have the following necessary volts:

    -1.05v P1V05S0 LL
    -1.2v PPDR_S3_REG
    -5v /3v power supply
    -3.3v_S5_REG
    -1.8v PPVCC_S0_CPU_PH1
    -24v from the baclight buck conveter

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    • mnciks11
      Badcaps Veteran
      • Aug 2019
      • 345
      • south Africa

      #3
      Re: How to tell if the bios file is corrupted on the MacBooks

      Kindly find photo attached
      Attached Files

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      • piernov
        Super Moderator
        • Jan 2016
        • 4435
        • France

        #4
        Re: How to tell if the bios file is corrupted on the MacBooks

        Try PRAM reset.
        Remove SSD and check if you get blinking question mark folder after a minute or 2.
        OpenBoardView β€” https://github.com/OpenBoardView/OpenBoardView

        Comment

        • mnciks11
          Badcaps Veteran
          • Aug 2019
          • 345
          • south Africa

          #5
          Re: How to tell if the bios file is corrupted on the MacBooks

          Originally posted by piernov
          Try PRAM reset.
          Remove SSD and check if you get blinking question mark folder after a minute or 2.
          I did that brother, no question mark, with or without the the SSD

          Let me measure PRAM reset, but keep in my that i do have ram voltage

          I will update you just now

          Comment

          • mnciks11
            Badcaps Veteran
            • Aug 2019
            • 345
            • south Africa

            #6
            Re: How to tell if the bios file is corrupted on the MacBooks

            I feel the need to share a solution on my case

            I reprogram the bios, the laptop started to display and indicated that the battery is low on the screen...With a corrupted bios chip you won’t have a chime sound on macbooks, cpu volts was available, ram volts was available, 1.05 volts was available, most necessary volts were available but I didn’t have any chime sound and display , keep in mind that there a was backlight on the screen but no image

            That why I reprogrammed the bios chip and the machine started to display
            Last edited by mnciks11; 06-11-2020, 04:03 AM.

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