Введение
Prerequisite for removing the logic board from a 21.5" Retina 4K 2019 iMac.
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Gently pull the left speaker cable straight out of its socket on the logic board.
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De-route the left speaker cable by pulling it straight up out of the retaining clip in the back of the rear enclosure.
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Similarly to the previous step, de-route the SATA and power cables by pulling the braid straight up out of the retaining clip.
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Peel up the piece of tape connecting the left speaker connector to the SATA power and data cables.
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Flip up the metal retaining bracket on the FaceTime camera cable connector.
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Pull the iSight camera cable straight out of its socket on the logic board.
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Remove the two 4.0 mm T5 Torx screws securing the four AirPort/Bluetooth antenna connectors.
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Rotate the top of the AirPort/Bluetooth connector bracket away from the logic board, then lift the bracket straight up and remove it.
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Use the point of a spudger to pry all four antenna connectors straight up from their sockets and disconnect them from the AirPort/Bluetooth card.
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Use a pair of tweezers or your fingers to pull the right speaker cable connector straight down and out of its socket on the logic board.
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Use the flat edge of a spudger to pry the headphone jack cable connector from its socket on the logic board.
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Push the cable slightly to the right to move it out of the way of the logic board.
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Remove the following T8 Torx screws securing the exhaust duct to the rear enclosure:
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Two 6.2 mm screws
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Two 4.7 mm screws
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Use the tip of a spudger to flip open the retaining flap on the microphone ribbon cable ZIF socket.
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Use tweezers to gently pull the microphone ribbon cable straight out of its socket.
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Remove the four 7.3 mm T8 Torx screws securing the logic board to the rear enclosure.
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Tilt the top of the logic board away from the rear enclosure.
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As you tilt the logic board, pull the right speaker connector to the right and out of the way of the board.
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Lift the logic board straight up and out of the iMac.
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Use a USB flash drive and/or ethernet cable to keep the logic board seated correctly while you tighten the screws.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
