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Apple Imac 820-2641-A bios request

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    #1

    Apple Imac 820-2641-A bios request

    Hello everybody,

    I wanted your help on this one please. Problem I think is with the bios because after upgrading the OS now it turns on, shows nothing on screen and fans are spinning at high speed.
    I have attached the dump as it is right now.


    Does anyone have a working one or can fix this if it has problem?

    Thanks in advance!
    Attached Files
    Tags: None
    #2
    Re: Apple Imac 820-2641-A bios request

    Hello,

    Thanks for your response, but I think it is for a different board / device.
    It is also smaller than mine.

    Comment

      #3
      Re: Apple Imac 820-2641-A bios request

      here you go, password removed
      Attached Files
      Im Back... sort of...

      Comment

        #4
        Re: Apple Imac 820-2641-A bios request

        Thanks a lot for your help!

        Comment

          #5
          Re: Apple Imac 820-2641-A bios request

          Hello again,

          Still trying to figure out the problem with this one.
          With the file from al_borbe I have the same issue.
          Schematic diagram is hard to find. Doing some measures I have 12V rail and on BIOS chip I can measure 3.3V. Already tried with a known working PSU.
          Funny thing is that problem occurred after upgrading the macOS. Already tried SMC reset. I have only the first led ON not the others. In order to power on the board the pwon switch has to be pressed and then connected the AC plug, but I have only fans spinning on high speed and nothing else (CPU doesn't heat up).
          Any tips ?

          Thanks in advance

          Comment

            #6
            Re: Apple Imac 820-2641-A bios request

            Thanks a lot for your

            Comment

              #7
              Re: Apple Imac 820-2641-A bios request

              Originally posted by lefos View Post
              Hello again,

              Still trying to figure out the problem with this one.
              With the file from al_borbe I have the same issue.
              Schematic diagram is hard to find. Doing some measures I have 12V rail and on BIOS chip I can measure 3.3V. Already tried with a known working PSU.
              Funny thing is that problem occurred after upgrading the macOS. Already tried SMC reset. I have only the first led ON not the others. In order to power on the board the pwon switch has to be pressed and then connected the AC plug, but I have only fans spinning on high speed and nothing else (CPU doesn't heat up).
              Any tips ?

              Thanks in advance
              I know it's an old stuff, but I have the exact same issue, what was the solution in your case?

              Comment

                #8
                Re: Apple Imac 820-2641-A bios request

                Just an update on this, figured out, so double checked the BIOS programmer's pinout, and used the firmware above, worked perfectly! Thanks for the share

                (After turn on the iMac had full blast on fans, totally blank screen, no blacklight at all.
                Worth to reprogram it a couple of times, and also use different AsProgrammer software.)

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