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An operational CPU fan is essential for keeping processor temperatures down.
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Orient the iMac face-side down on a table with the bottom edge facing yourself.
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Remove the two Phillips screws securing the access door to the bottom grille of your iMac.
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Remove the three T8 Torx screws securing the front bezel to the rear case along the lower edge of the iMac.
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Turn the computer over.
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Use your thumbs to press both RAM arms in past the front bezel for enough clearance to lift it off the rear case.
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While holding the RAM arms in with your thumbs, lift the lower edge of the front bezel enough to clear the rear case.
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Insert a plastic card up into the corner of the air vent slot near the top of the rear case.
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Push the card toward the top of the iMac to release the front bezel latch.
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Pull the front bezel away from the rear case.
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Repeat this process for the other side of the front bezel.
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If the bezel refuses to release, try pressing the lower edge back onto the rear case and repeat this opening process.
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Lay your iMac stand-side down on a table.
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Lift the front bezel from its lower edge and rotate it away from the rest of your iMac, minding the RAM arms that may get caught.
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Lay the front bezel above the rest of the iMac.
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If necessary, remove the piece of kapton tape wrapped around the microphone and camera connectors.
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Disconnect both the camera and microphone cables.
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Peel the lower EMI shield off the lower edge of the iMac and off the two vertical 4" sections on either side of the iMac.
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Tape the lower EMI shield up against the face of the display to keep it out of the way while you work.
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Remove the two T6 Torx screws securing the display data cable connector to the logic board.
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To disconnect the display data cable, grab its connector's black tab and pull it away from the face of the logic board.
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Peel back the two EMI tape strips from the left and right edges of the display.
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Remove the four recessed T10 Torx screws securing the display to the rear case.
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Lift the lower edge of the display slightly out of the rear case.
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Disconnect both inverter cables (shown in red) by pulling their connectors toward the bottom edge of your iMac.
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Lift the display until it is nearly perpendicular to the rear case.
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Disconnect the remaining two inverter cables (shown in red) by pulling their connectors toward the top edge of your iMac.
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While holding the display perpendicular to the rear case, pull it upward to peel off the EMI shield stuck to its upper edge.
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Disconnect the IR board cable by pulling its connector away from the socket on the IR board.
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Remove the two T6 Torx screws securing the IR board bracket to the IR board.
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De-route the IR cable from under the aluminum heat sink and tuck it behind the optical drive to keep it out of the way.
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Remove the single T10 Torx screw securing the left speaker to the rear case.
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Lift the left speaker out of the rear case and de-route its cable across the logic board.
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Remove the single T10 Torx screw securing the right speaker to the rear case.
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Lift the right speaker out of the rear case, minding the short cable between the speaker and its connector (located slightly above the right speaker).
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Disconnect the speakers from the logic board by pulling their connector toward the top edge of the iMac.
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Remove the two Phillips or two T6 Torx screws securing the AirPort/Bluetooth board to the logic board.
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Use your finger to lift the AirPort/Bluetooth board from its left edge, disconnecting it from the logic board.
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Use the flat end of a spudger to pry both antenna cable connectors up off the AirPort/Bluetooth board.
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Disconnect the DC-in cable by simultaneously depressing both locking arms and pulling its connector away from the socket on the logic board toward the top of your iMac.
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Disconnect the ambient light sensor by pulling its connector away from the face of the logic board.
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Disconnect the optical drive fan from the logic board.
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Disconnect the IR/camera cable from the logic board.
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Disconnect the optical drive thermal sensor cable from the logic board by pulling its connector toward the left edge of the iMac.
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Remove the two T6 Torx screws securing the optical drive connector to the logic board.
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Use the flat end of a spudger to pry the optical drive connector up off the logic board.
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Disconnect the CPU fan from the logic board by pulling its connector toward the top edge of the iMac.
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Disconnect the hard drive thermal sensor from the logic board by pulling its connector toward the top edge of the iMac.
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Disconnect the hard drive fan by pulling its connector away from the face of the logic board.
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Disconnect the power button cable by pulling its connector away from the face of the logic board.
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Remove the two T6 Torx screws near the top of the heat sinks.
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Remove the following seven screws securing the logic board to the rear case:
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Three coarse-thread T10 Torx.
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Three fine-thread T10 Torx.
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One long coarse-thread T10 Torx.
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Tuck the RAM arms into the iMac so they rest on the perforated metal grille along its lower edge.
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Rotate the top of the logic board toward yourself slightly.
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Pull the right edge of the logic board toward yourself slightly to free the I/O ports from the rear case, being careful not to bend the board.
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Continue rotating the board toward yourself until you have enough room to reach the SATA connector, shown in the next step.
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Continue rotating the board toward yourself until you have enough room to reach the SATA connector (shown in red).
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Insert the blunt end of a metal spudger between the SATA connector and its socket. Twist the shaft of the metal spudger to separate the connector from its socket.
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Disconnect the SATA cable from the logic board.
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Lift the logic board out of the rear case by its edges, minding any cables that may get caught.
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Lift the CPU fan off the plastic posts protruding from the rear case.
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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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