Einleitung
Use this guide to replace the logic board.
Was du brauchst
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In diesem Schritt verwendetes Werkzeug: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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Finish pushing the opening tool to the bottom of the right side of the display.
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In diesem Schritt verwendetes Werkzeug: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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Gently twist the card upward, slightly increasing the space between the display and frame.
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Slide the plastic card toward the center, again stopping just before the iSight camera.
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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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In diesem Schritt verwendetes Werkzeug:Tweezers$4.99
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Use a pair of tweezers to 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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While holding the display up with one hand, use the other hand to unplug the display power cable.
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In diesem Schritt verwendetes Werkzeug:Plastic Cards$2.99
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Grasp the small tab at the end of one of the bottom edge display adhesive strips and pull the adhesive toward the top of the iMac to remove it.
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Repeat this step with the other adhesive strip and remove it.
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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 following five Phillips screws holding the lower support bracket in place:
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Four 3.2 mm screws
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One 1.7 mm screw
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Use the tip of a spudger to push on either side of the right speaker cable connector to walk it out of its socket on the logic board.
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Remove the two 10.0 mm T10 screws securing the right speaker to the rear enclosure.
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Insert the tip of a spudger between the right speaker and the antenna cable that is routed into the speaker's right side.
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Run the spudger down along the right side of the speaker to pry the antenna cable from its channel in the right speaker.
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Remove the following screws securing the hard drive bracket to the rear enclosure:
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Two 21 mm T10 Torx screws from the left-hand hard drive bracket.
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One 9 mm T10 Torx screw.
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One 27 mm T10 Torx screw.
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Use the tip of a spudger to push each side of the power button cable connector and gently walk it out of its socket.
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Use the tip of a spudger to push each side of the power supply control cable connector and gently walk it out of its socket.
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Remove the two 7.2 mm T10 Torx screws securing the power supply to the rear enclosure.
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Pull the power supply slightly up and out from the rear enclosure.
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Rotate the power supply counterclockwise, lifting the right side up about an inch higher than the left.
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Slide the power supply to the right to clear the screw posts on the rear enclosure.
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Rock the power supply forward and remove it from its recess in the rear enclosure.
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Squeeze the tab on the back side of the DC power cable connector and pull it straight out of its socket on the back of the logic board.
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Use the flat end of a spudger to press the clip on the side of the AC inlet cable connector inward.
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While pressing on the release clip with the spudger, grasp the AC inlet cable, and pull the connector straight out of its socket.
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Use the tip of a spudger to push the fan cable connector out of its socket on the logic board.
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Remove the following screws securing the fan to the rear enclosure:
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Two 12.5 mm T10 screws
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One 9.9 mm T10 screw
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Lift the hard drive from the edge nearest the logic board and pull it slightly out of its recess.
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Use a spudger to disconnect the single SATA power and data combo cable by gently prying its large plastic connector away from the hard drive.
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Remove the single 7.2 mm T10 screw securing the hard drive tray to the rear enclosure.
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Use the tip of a spudger to walk the left speaker cable connector out of its socket.
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De-route the left speaker cable by pulling it straight up out of the retaining clip in the back of the rear enclosure.
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In a similar fashion as the previous step, de-route the combo SATA data/power cable up out of the retaining clip.
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In diesem Schritt verwendetes Werkzeug:Tweezers$4.99
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Use a pair of tweezers to flip up the metal retaining bracket on the iSight camera cable connector.
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Pull the iSight camera cable straight out of its socket on the logic board.
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Use the tip of a spudger to disconnect each of the four antenna connectors from the AirPort/Bluetooth card.
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Use the flat edge of a spudger to pry the headphone jack cable connector from its socket on the logic board.
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Remove the following screws securing the exhaust duct to the rear enclosure:
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Two 6.3 mm T8 screws
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Two 4.7 mm T8 screws
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Remove the four 7.2 mm T10 screws securing the logic board to the rear enclosure.
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Use a USB flash drive and/or ethernet cable to keep the logic board aligned while you screw it in.
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While pressing on the clip with your thumb, lift and disconnect the SATA data connector from its socket on the logic board.
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Grasp the hard drive power connector and gently pull it out of its socket on the logic board.
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The following screws secure the heat sink to the logic board:
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Remove the two T8 screws from the exhaust port end of the heat sink.
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Loosen, but do not remove, the four captive T8 screws securing the CPU end of the heat sink.
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Remove the two 3.2 mm T5 screws securing the AirPort/Bluetooth card to the logic board.
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During reassembly of the logic board, pay attention to the position of the I/O connectors. When the board is back in the case, insert a USB or Thunderbolt cable into one of the connectors to align it perfectly.
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To reassemble your device, follow these instructions in reverse and use our Adhesive Strips Guide to reattach the display glass.
To reassemble your device, follow these instructions in reverse and use our Adhesive Strips Guide to reattach the display glass.
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