iMac Intel 21.5" Retina 4K Display (2017) Logic Board Assembly Replacement

Step 1 Logic Board Assembly



• Gently pull the left speaker cable straight out of its socket on the logic board.
Step 2

• De-route the left speaker cable by pulling it straight up out of the retaining clip in the back of the rear enclosure.
Step 3
• Similarly to the previous step, de-route the SATA and power cables by pulling the braid straight up out of the retaining clip.
Step 4
• Peel up the piece of tape connecting the left speaker connector to the SATA power and data cables.
Step 5
• Flip up the metal retaining bracket on the FaceTime camera cable connector.
• Pull the FaceTime camera cable straight out of its socket on the logic board.
• This is a delicate connector that can be easily damaged.
Step 6
• Remove the two 4.0 mm T5 Torx screws securing the four antenna connectors to the AirPort/Bluetooth card.
Step 7
• Disconnect all four antenna connectors by prying them straight up from their sockets on the AirPort/Bluetooth card.
Step 8
• Gently pull the right speaker cable connector straight down and out of its socket on the logic board.
Step 9
• Use the flat edge of a spudger to pry the headphone jack cable connector from its socket on the logic board.
• Push the cable slightly to the right.
Step 10
• Peel off the tape covering the exhaust duct.
Step 11
• Remove the following T8 Torx screws securing the exhaust duct to the rear enclosure:
• Two 6.2 mm screws
• Two 4.7 mm screws
Step 12
• Use the tip of a spudger to flip open the retaining flap on the microphone ribbon cable ZIF socket.
• Be sure you are prying up on the hinged retaining flap, not the socket itself.
• Gently pull the microphone ribbon cable straight out of its socket.
Step 13
• Remove the four 7.3 mm T8 Torx screws securing the logic board to the rear enclosure.
Step 14
• Tilt the top of the logic board away from the rear enclosure.
• As you tilt the logic board, pull the right speaker connector to the right and out of the way of the board.
• Lift the logic board straight up and out of the iMac.
• Be careful not to snag the board on any of the rear enclosure's screw posts.

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Adam O'Camb

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