MacBook Air A1466 2017 Operating Very Slow

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  • dellxps15
    Badcaps Legend
    • Feb 2014
    • 1585
    • italy
    #21
    Re: MacBook Air A1466 2017 Operating Very Slow

    cpu power ic looks perfectly clean ?

    i mean the 2 white thing near cpu coils.

    voltage on cpu coils ?

      Comment

      • ACS-Repair
        Badcaps Veteran
        • Feb 2021
        • 203
        • Canada
        #22
        Re: MacBook Air A1466 2017 Operating Very Slow

        Oh those, yes. I thought there was something else.
        Voltage is 1.80v measured on the coils and both sides of the resistors.

          Comment

          • piernov
            Super Moderator
            • Jan 2016
            • 4435
            • France
            #23
            Re: MacBook Air A1466 2017 Operating Very Slow

            .
            Attached Files
            OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

              Comment

              • ACS-Repair
                Badcaps Veteran
                • Feb 2021
                • 203
                • Canada
                #24
                Re: MacBook Air A1466 2017 Operating Very Slow

                Voltage on U5540 pin 4 hoovers around 0v with the board removed from the computer. this compares to a 2015 that i have under the same conditions. Measurements compare between the two boards. The voltage does jump to about .2v when the board is powered, then drops back probably due to the missing trackpad. Again, both boards exhibit the same levels.

                I did some diode checking on the SMBuss and compared the two boards. They have very similar values so probably not an issue.

                SMBUS_SMC_1_S0_SCL .553
                SMBUS_SMC_1_S0_SDA .553

                CPUVR_ISNS1_P_R .537
                CPUVR_ISNS1_P_R .630 (both boards have this value difference)

                SMBUS_SMC_5_G3_SCL .526
                SMBUS_SMC_5_G3_SCL .529

                I thought I may have an SMC issue but it's hard to say now. My solder paste dried up so I am several weeks away before trying to replace the SMC, if I choose to.

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