macbook 820-3437 with strange behavior

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  • rookieme
    Badcaps Veteran
    • Oct 2014
    • 396
    • Greece
    #1

    macbook 820-3437 with strange behavior

    The system had liquid damage and was repaired by cleaning and replacing faulty parts.
    The only issue is that it cannot power on sometimes when connected to power and has to be disconnected from the power in order to power on properly with battery and after that power can be connected.
    This happens only if you boot to OS so if you just power on and off without booting to OS it has no issues powering on again with the ac power connected.

    I have also reprogrammed a clean bios

    Any suggestions?
    Tags: None
    • reformatt
      Badcaps Legend
      • Feb 2020
      • 1398
      • Australia
      #2
      Re: macbook 820-3437 with strange behavior

      820-3437 boards always do a start/stop/start/stop/start fan spin sequence before an attempt is made to boot. Is it doing that on magsafe only at least? Also ensure you are using a genuine magsafe charger and not a knock off.

        Comment

        • rookieme
          Badcaps Veteran
          • Oct 2014
          • 396
          • Greece
          #3
          Re: macbook 820-3437 with strange behavior

          The first boot sequence is always successful, the issue can occur only if the system boots at OS first and shutdown after.
          The charger is not original but I use it at same models without any issues.
          At the case the system refuses to power on with the charger connected if I disconnect it always powers on with the battery.
          Same issue occurs with the data cable disconnected from the magsafe board so the charger quality is not the deal here.

            Comment

            • reformatt
              Badcaps Legend
              • Feb 2020
              • 1398
              • Australia
              #4
              Re: macbook 820-3437 with strange behavior

              What area of the board was liquid damaged? Seems SMC related.

                Comment

                • rookieme
                  Badcaps Veteran
                  • Oct 2014
                  • 396
                  • Greece
                  #5
                  Re: macbook 820-3437 with strange behavior

                  Indeed SMC area has issues, so far I had fixed some components there and now I did also a SMC reflow that seems to solve the issue so far.

                  Thank you for your time!

                    Comment

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