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A1398 emc2673 820-00426-a disable the discrete

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    A1398 emc2673 820-00426-a disable the discrete

    Hi all, you have a solution, information on jumpers to disable the discrete on A1398 820-00426-a.

    #2
    Re: A1398 emc2673 820-00426-a disable the discrete

    Should work the same as 820-3332.
    https://www.badcaps.net/forum/showpo...47&postcount=3
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

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      #3
      Re: A1398 emc2673 820-00426-a disable the discrete

      Thanks , i am try this

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        #4
        Re: A1398 emc2673 820-00426-a disable the discrete

        Hello everyone. Initially it turned on, there was a gong, there was no image. I found two solutions to disable the discrete card and transfer to UMA, tried both, now: there is a gong, there is a backlight, there is no image. Was guided by the solution and the diagram from A1398 820-3332 in brackets,
        signals LCD_MUX_SEL LCD_MUX_EN put on GND, L9330 L9410 (L8960 L8930) turned off, and applied 3.3v to LCD_BKLT_EN and LCD_PWR_EN.


        One of the similar topics http://********/viewtopic.php?f=51&t=106005

        Disconnected discrete on these devices. There GMUX is not alone, there is one mikruha that controls everything and the other is just an analog switch! What did you change? I would remove the U9600 microcircuit, then I would turn on the matrix power, the backlight resolution, and so on with five wires. Namely, LCD_MUX_EN -3.3v, LCD_PWR - selection from the built-in, LCD_BKL_EN-selection from the built-in, LCD_MUX_SEL- GND, well, supply 3.3 volts to the PWM backlight, and you turn off the discrete, even the power will not go to it. If the working processor and analog commutator, then you will immediately receive an image on the built-in Intel, if there is no image, check the analog commutator. Sometimes there is an apple and after loading it hangs. In general, I have often come across dependencies on these platforms immediately after loading. The described method immediately cuts off everything except the processor, if problems remain, then we look at the power supply of the processor, and then the percent itself.


        Can you tell me what I'm doing wrong or it doesn't make sense Thank you
        Last edited by skynet85; 07-01-2021, 01:58 AM.

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          #5
          Re: A1398 emc2673 820-00426-a disable the discrete

          thank you all very much, I defeated him

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            #6
            Re: A1398 emc2673 820-00426-a disable the discrete

            Would you Share the solution, i mean what was wrong before?
            FairRepair on YouTube

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              #7
              Re: A1398 emc2673 820-00426-a disable the discrete

              Originally posted by Sephir0th View Post
              Would you Share the solution, i mean what was wrong before?
              We also need this solution ?

              Comment


                #8
                Re: A1398 emc2673 820-00426-a disable the discrete

                skynet 85, then share the solution, I have the same macbook with the same defect, thanks.

                Comment


                  #9
                  Re: A1398 emc2673 820-00426-a disable the discrete

                  I'll post it later

                  Comment


                    #10
                    Re: A1398 emc2673 820-00426-a disable the discrete

                    Its not too late. It is not fair to not share the solution after all.

                    Comment


                      #11
                      Re: A1398 emc2673 820-00426-a disable the discrete

                      Originally posted by skynet85 View Post
                      thank you all very much, I defeated him
                      you were suppose to post the solution long back...please do....

                      Thanks in advance

                      Comment


                        #12
                        Re: A1398 emc2673 820-00426-a disable the discrete

                        There are many that enter the witness protection program after they get the help they need from this forum.

                        Comment


                          #13
                          Re: A1398 emc2673 820-00426-a disable the discrete

                          Originally posted by mon2 View Post
                          There are many that enter the witness protection program after they get the help they need from this forum.


                          I completely agree with you Mon, well said.

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                            #14
                            Re: A1398 emc2673 820-00426-a disable the discrete

                            Originally posted by mon2 View Post
                            There are many that enter the witness protection program after they get the help they need from this forum.
                            LOL

                            do think that sending private message will help by any chance?!?!

                            Comment


                              #15
                              Re: A1398 emc2673 820-00426-a disable the discrete

                              hello everybody, here the solution that i use in this case, i hope help all

                              Note: for good working is necessary OSX Sierra or older, maybe if you install upper this the machine after sleep show black screen.
                              Attached Files

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                                #16
                                A1398 emc2673 820-00426-a disable the discrete

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