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A1990 2019 will not load

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    #1

    A1990 2019 will not load

    Hello, I received an A1990, which is said to have simply switched off during operation and no longer started. Nothing is said to have been done to the logic board. But I have now seen that the Q3100 and Q3200 have been blown or swapped! The MacBook starts normally but does not load! So if the battery is empty it won't start anymore!
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    #2
    Re: A1990 2019 will not load

    Originally posted by Strolch View Post
    Hello, I received an A1990, which is said to have simply switched off during operation and no longer started. Nothing is said to have been done to the logic board. But I have now seen that the Q3100 and Q3200 have been blown or swapped! The MacBook starts normally but does not load! So if the battery is empty it won't start anymore!
    Look Picture
    Attached Files

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      #3
      Re: A1990 2019 will not load

      Hi. SSD will not load ? Check the voltage of PP2V5_NAND_SSD0 to ground.

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        #4
        Re: A1990 2019 will not load

        The Mac will not load.During the first test I had 5V and 1.8 amps but now nothing is displayed on the USB-C connector.
        I think Q3200 and Q3100 are damage
        Attached Files
        Last edited by Strolch; 12-03-2022, 02:10 PM.

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          #5
          Re: A1990 2019 will not load

          I swapped Q3100 and Q3200. Then the 4.765V and 2.843A showed up and then it went out and nothing shows up anymore. only sometimes a slight light.
          Attached Files
          Last edited by Strolch; 12-03-2022, 03:57 PM.

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            #6
            Re: A1990 2019 will not load

            Check the fuses that are on the same rails.

            It is possible that these dual mosfets are defective but check the fuses first @ F3000 & F3001.

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              #7
              Re: A1990 2019 will not load

              Fuses are ok

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                #8
                Re: A1990 2019 will not load

                And the MacBook A1990 works but the battery only has 25% and then it stays off ;-)

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                  #9
                  Re: A1990 2019 will not load

                  Whether the CD3215A has anything to do with it?

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                    #10
                    Re: A1990 2019 will not load

                    Check the voltage readings of the smbus lines on the battery connector. These are the SCL and SDA pins.

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