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This guide will show you how to replace your iMac's logic board.
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Lay your iMac front side down on a table with the lower edge facing yourself.
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Loosen the single Phillips screw in the center of the access door.
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Remove the access door from your iMac.
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Stick two suction cups to opposing corners of the glass panel.
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Gently pull the glass panel straight up off the iMac.
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Remove the following 12 screws securing the front bezel to the rear case:
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Eight 13 mm T8 Torx.
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Four 25 mm T8 Torx.
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Gently lift the front bezel from its top edge off the rear case.
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Once the top edge of the front bezel has cleared the rear case, rotate the front bezel toward the stand and lift it off the rear case.
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Rotate the front bezel away from the rest of the device and lay it above the top edge of the iMac.
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Disconnect the microphone cable connector, removing tape as necessary.
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Pull the LCD temperature sensor connector straight up off its socket on the logic board.
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(located at the top of the logic board on the 24")
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Remove the two T6 Torx screws securing the display data cable to the logic board.
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Use the attached black tab to pull the display data cable connector straight away from the logic board.
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Remove the eight T8 Torx screws securing the display panel to the rear case.
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Lift the display panel from its left edge and rotate it toward the right edge of the iMac.
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With the display panel still lifted, disconnect the four inverter cables.
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(combined into one plug in on the 24")
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Remove the single T10 Torx screw securing the right speaker to the rear case.
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Disconnect the right speaker cable connector from the audio board by pulling it straight up from its socket.
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Gently lift the right speaker out of the rear case.
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Disconnect the optical drive fan connector from the audio board by pulling it straight away from its socket.
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Gently lift the optical drive fan off the plastic posts protruding from the rear case.
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Insert the flat end of a spudger into the gap between the optical drive data cable connector and its socket.
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Twist the spudger to separate the connector from its socket.
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Disconnect the microphone cable connector from the audio board by pulling it straight up from its socket.
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Disconnect the following connectors:
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Hard drive thermal sensor cable.
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Optical drive thermal sensor cable.
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Hard drive fan cable.
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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.
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Pull the SATA data cable straight up off the logic board.
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Use the flat end of a spudger to pry both antenna connectors up off the AirPort Extreme card.
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Disconnect the left speaker connector from the audio board by pulling it straight away from its socket.
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De-route the left fan cable from the channel on the CPU fan.
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Disconnect the following connectors:
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Ambient temperature sensor cable.
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Power button cable.
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CPU fan cable.
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Disconnect the camera cable connector from the logic board by pulling it straight up from its socket.
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Use the flat end of a spudger to pry the bluetooth antenna connector up off the bluetooth board.
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Use the sharp end of a spudger to peel the EMI tape off the headphone/microphone jacks.
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Remove the following screws securing the logic board to the rear case:
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Three fine-thread T10 Torx.
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Six coarse-thread T10 Torx.
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One longer coarse-thread T10 Torx.
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Two coarse-thread T8 Torx.
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Lift the logic board assembly out of the rear case, minding any cables or I/O ports that may get caught.
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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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