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iMac Intel 27" EMC 2546 Logic Board Assembly Replacement

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  1. iMac Intel 27" EMC 2546 Logic Board Assembly Replacement, Logic Board Assembly: étape 1, image 1 de 3 iMac Intel 27" EMC 2546 Logic Board Assembly Replacement, Logic Board Assembly: étape 1, image 2 de 3 iMac Intel 27" EMC 2546 Logic Board Assembly Replacement, Logic Board Assembly: étape 1, image 3 de 3

    • Use the flat end of a spudger to disconnect each of the four antenna connectors from the AirPort/Bluetooth card.

    • Note the original positions for each connector when reconnecting the cables. From left to right on the card, the antennas are connected in the following order:

    • Leftmost

    • Top

    • Upper right

    • Lower right

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  2. iMac Intel 27" EMC 2546 Logic Board Assembly Replacement: étape 2, image 1 de 3 iMac Intel 27" EMC 2546 Logic Board Assembly Replacement: étape 2, image 2 de 3 iMac Intel 27" EMC 2546 Logic Board Assembly Replacement: étape 2, image 3 de 3

    • This is a delicate connection that can be easily broken.

    • Flip up the metal retaining bracket on the iSight camera cable.

    • Pull the camera cable connector straight out of its socket, toward the top of the iMac.

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  3. iMac Intel 27" EMC 2546 Logic Board Assembly Replacement: étape 3, image 1 de 3 iMac Intel 27" EMC 2546 Logic Board Assembly Replacement: étape 3, image 2 de 3 iMac Intel 27" EMC 2546 Logic Board Assembly Replacement: étape 3, image 3 de 3

    • Use the flat end of a spudger to disconnect the headphone jack cable connector from its socket on the logic board.

    • Gently push the cable out of the way.

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  5. iMac Intel 27" EMC 2546 Logic Board Assembly Replacement: étape 4, image 1 de 2 iMac Intel 27" EMC 2546 Logic Board Assembly Replacement: étape 4, image 2 de 2

    • Remove the following screws from the front of the logic board:

    • Two 23.7 mm T10 screws

    • Four 7.4 mm T10 screws

    • One 20.8 mm T25 spacer screw

    • One captive T10 screw

    • This screw is beneath a hole in the logic board. You'll need a fixed screwdriver or the 60 mm extension from an iFixit driver kit to reach it.

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  6. iMac Intel 27" EMC 2546 Logic Board Assembly Replacement: étape 5, image 1 de 3 iMac Intel 27" EMC 2546 Logic Board Assembly Replacement: étape 5, image 2 de 3 iMac Intel 27" EMC 2546 Logic Board Assembly Replacement: étape 5, image 3 de 3

    • The hard drive SATA cable can't be removed just yet, but will get in the way of removing the logic board.

    • Pull the cable and connector through the right hard drive bracket. Move the cable to the right side of the iMac, out of the way of the exhaust port.

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  7. iMac Intel 27" EMC 2546 Logic Board Assembly Replacement: étape 6, image 1 de 1

    • Remove two 5.7 mm T10 screws from the top of the heat sink exhaust duct.

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  8. iMac Intel 27" EMC 2546 Logic Board Assembly Replacement: étape 7, image 1 de 3 iMac Intel 27" EMC 2546 Logic Board Assembly Replacement: étape 7, image 2 de 3 iMac Intel 27" EMC 2546 Logic Board Assembly Replacement: étape 7, image 3 de 3

    • Tilt the logic board slightly forward.

    • Lift the logic board straight up and out of the iMac. Be careful not to snag on any of the screw posts attached to the inside of the rear case.

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  9. iMac Intel 27" EMC 2546 Logic Board Assembly Replacement: étape 8, image 1 de 2 iMac Intel 27" EMC 2546 Logic Board Assembly Replacement: étape 8, image 2 de 2

    • When reassembling your iMac, be very careful to align the exterior I/O ports correctly. The logic board can sit crooked even when secured with all its screws.

    • You can use a USB flashdrive or ethernet cable to ensure the logic board is seated correctly while you screw it in.

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Conclusion

To reassemble your device, follow these instructions in reverse order.

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Andrew Optimus Goldheart

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