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Restore sound to your iMac by replacing the audio 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 left speaker cable connector from the audio board by pulling it straight away 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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Using the tip of a spudger, flip up the audio to logic board ribbon cable retaining flap (toward the bottom edge of your iMac).
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Pull the audio to logic board ribbon cable straight out of its socket.
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Remove the four T6 Torx screws securing the audio board to the logic board.
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Use the sharp end of a spudger to remove the EMI aluminum tape covering the microphone/headphone jacks.
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Carefully lift the audio board out of your iMac.
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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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