Introduction
Use this guide to replace a faulty or failing AirPort/Bluetooth card in your iMac Intel 21.5" EMC 2889.
What you need
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Tool used on this step:iMac Intel 21.5" Cardboard Service Wedge$4.99
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Before beginning any work on your iMac: Unplug the computer and press and hold the power button for ten seconds to discharge the power supply's capacitors.
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Starting on the left of the display, near the power button, insert the iMac Opening Tool into the gap between the glass panel and the rear enclosure.
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Use the tool like a pizza cutter—roll it along through the gap, and it will cut the foam adhesive through the center.
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Run the tool up along the left side of the display.
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Tool used on this step:Plastic Cards$2.99
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Starting from the top right corner of the iMac, wedge a plastic card between the display and frame.
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Gently twist the plastic card sideways to create a gap between the display and frame.
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Move slowly and be careful not to stress the display glass too much—you only need to make a gap of about 1/4".
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Slide the card toward the center of the display to cut any of the remaining adhesive along the top right corner of the iMac.
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Wedge the plastic card into the top right corner once again, and leave it there to prevent the adhesive from resticking.
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Insert a second plastic card into the gap between the display and frame near the top left corner of the iMac.
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With both plastic cards inserted as shown near the corners, gently twist the cards sideways to increase the gap between display and case.
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Begin to lift the top of the display up from the frame.
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Hold the display with one hand while using your other hand to unplug the display power cable.
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Continuing to support the display with one hand, flip up the metal retaining bracket on the display data cable.
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Carefully pull the display data cable from its socket on the logic board.
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Lift the display up from the frame and remove it from the iMac.
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It may be necessary to slowly lift from one side to peel against the remaining adhesive.
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Remove the two 4.0 mm T5 Torx screws securing the four antenna connectors to the AirPort/Bluetooth card.
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Use a spudger to disconnect all four antenna connectors by prying them up from their sockets on the AirPort/Bluetooth Card
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Remove the two 3.3 mm T5 Torx screws securing the AirPort/Bluetooth card to the logic board.
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With a firm grip on the edges of the AirPort/Bluetooth card, pull it straight out of its socket on the underside of the logic board.
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With the tweezers pointed downwards, insert the points of the tweezers through the screw holes in the AirPort card, next to its antenna connector sockets.
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Using your finger, press down on the edge of the AirPort card to angle it until it is roughly parallel to the logic board.
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Align the AirPort card with its slot on the logic board, and press the card into the slot until the screw holes nearest the connector align with those in the logic board.
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