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Prereq only.

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  1. iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement, Logic Board Assembly: step 1, image 1 of 2 iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement, Logic Board Assembly: step 1, image 2 of 2
    • Push on each side of the left speaker cable connector with the tip of a spudger and gently "walk" it out of its socket.

  2. iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement: step 2, image 1 of 2 iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement: step 2, image 2 of 2
    • De-route the left speaker cable by pulling it straight up out of the retaining clip in the back of the rear enclosure.

  3. iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement: step 3, image 1 of 3 iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement: step 3, image 2 of 3 iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement: step 3, image 3 of 3
    • In a similar fashion as the previous step, de-route the SATA data and power cables up out of the retaining clip.

  4. iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement: step 4, image 1 of 3 iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement: step 4, image 2 of 3 iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement: step 4, image 3 of 3
    • Use the flat edge of a spudger to flip up the metal retaining bracket on the iSight camera cable connector.

    • Pull the iSight camera cable straight out of its socket on the logic board.

    • This is a delicate connector that can be easily damaged.

  5. iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement: step 5, image 1 of 3 iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement: step 5, image 2 of 3 iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement: step 5, image 3 of 3
    • Use the flat edge 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.

  6. iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement: step 6, image 1 of 3 iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement: step 6, image 2 of 3 iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement: step 6, image 3 of 3
    • Use the flat edge of a spudger to pry the headphone jack cable connector from its socket on the logic board.

    • Push the cable slightly to the right.

  7. iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement: step 7, image 1 of 1
    • Remove the following screws securing the exhaust duct to the rear enclosure:

    • Two 6.3 mm T8 screws

    • Two 4.7 mm T8 screws

  8. iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement: step 8, image 1 of 1
    • Remove the four 7.2 mm T10 screws securing the logic board to the rear enclosure.

  9. iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement: step 9, image 1 of 3 iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement: step 9, image 2 of 3 iMac Intel 21.5" EMC 2544 Logic Board Assembly Replacement: step 9, image 3 of 3
    • Tilt the top of the logic board away from the rear enclosure.

    • Lift the logic board straight up and out of the iMac.

    • Be careful not to snag the board on any of the rear case's screw posts.

    • The I/O boards at the bottom of the logic board will be the greatest challenge. It is recommended to pull gently to avoid any damage.

    • 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 order.

Sam Goldheart

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Community

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