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Use this guide to replace a failed microphone. Replacing the microphone requires removal of the logic board.
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Remove the following ten screws securing the lower case to the upper case:
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Three 13.5 mm (14.1 mm) Phillips screws.
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Seven 3 mm Phillips screws.
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Using both hands, lift the lower case near the vent to pop it off two clips securing it to the upper case.
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Remove the lower case and set it aside.
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Use the edge of a spudger to pry the battery connector upwards from its socket on the logic board.
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Bend the battery cable slightly away from its socket on the logic board so it does not accidentally connect itself while you work.
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Remove the following three screws securing the left fan to the logic board:
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Two 3.5 mm T6 Torx screws.
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One 4.2 mm T6 Torx screw.
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Use the flat end of a spudger to disconnect the left fan connector from the logic board.
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Lift the left fan out of the upper case.
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Use the flat end of a spudger to lift the right fan connector out of its socket on the logic board.
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Remove the three 3.4 mm (3.1 mm) T6 Torx screws securing the right fan to the logic board.
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Lift the right fan out of its opening in the logic board.
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Pull the camera cable out of its socket on the logic board.
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Use the flat end of a spudger to pry the AirPort/Bluetooth connector up from its socket on the logic board.
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Use the flat end of a spudger to lift the optical drive connector out of its socket on the logic board.
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Disconnect the hard drive/IR sensor cable from its socket on the logic board by lifting up from beneath its connector.
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Use the flat end of a spudger to lift the subwoofer/right speaker connector out of its socket on the logic board.
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Remove the two 1.5 mm ( 1.2 mm ) Phillips screws securing the keyboard/trackpad cable cover to the logic board.
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Lift the cover off the logic board and set it aside.
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Use the flat end of a spudger to pry the trackpad connector up and out of its socket on the logic board.
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Use your fingernail to flip up the retaining flap on the keyboard ribbon cable ZIF socket.
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Use the tip of a spudger to pull the keyboard ribbon cable out of its socket.
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Use the flat end of a spudger to lift the battery indicator connector up and out of its socket on the logic board.
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Grab the plastic pull tab secured to the display data cable lock and rotate it toward the DC-In side of the computer.
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Pull the display data cable straight out of its socket on the logic board.
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Use the tip of a spudger to flip up the retaining flap on the keyboard backlight ribbon cable ZIF socket.
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Pull the keyboard backlight ribbon cable out of its socket.
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Remove the following nine screws:
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Seven 3.4 mm ( 3.1 mm) T6 Torx screws on the logic board
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Two 8 mm T6 Torx screws on the DC-In board
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Carefully lift the logic board assembly from its left side and work it out of the upper case, minding the optical drive cable and the I/O ports that may get caught during removal.
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If necessary, use the flat end of a spudger to separate the microphone from the upper case.
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Pull the I/O port side of the logic board away from the side of the upper case and remove the logic board assembly.
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Remove the two 5 mm Phillips screws securing the left speaker to the logic board.
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Carefully pull the left speaker wires upward to lift the left speaker connector out of its socket on the logic board.
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Carefully pull the microphone cables upward to lift the microphone connector out of its socket on the logic board.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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If there’s no microphone connected to the logic board, there could be a chance that kernel_task uses high cpu utilization (like 700%+)?
