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prerequisite for logic board, heat sink, and CPU

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  1. iMac Intel 27" EMC 2546 Heat Sink Replacement, Heat Sink: step 1, image 1 of 3 iMac Intel 27" EMC 2546 Heat Sink Replacement, Heat Sink: step 1, image 2 of 3 iMac Intel 27" EMC 2546 Heat Sink Replacement, Heat Sink: step 1, image 3 of 3
    • Remove the four 7.5 mm T8 screws from behind the GPU on the logic board.

    • These screws are set inside large, spring-loaded Phillips #2 screws. To prevent the larger screws from spinning when you loosen the T8 screws, hold them with a fingertip or Phillips #2 screwdriver.

  2. iMac Intel 27" EMC 2546 Heat Sink Replacement: step 2, image 1 of 1
    • Remove the bracket from behind the GPU heat sink.

  3. iMac Intel 27" EMC 2546 Heat Sink Replacement: step 3, image 1 of 1
    • Remove four black stickers from the back of the CPU heat sink.

  4. iMac Intel 27" EMC 2546 Heat Sink Replacement: step 4, image 1 of 1
    • Remove four 12.3 mm T10 screws from the back of the CPU heat sink.

  5. iMac Intel 27" EMC 2546 Heat Sink Replacement: step 5, image 1 of 3 iMac Intel 27" EMC 2546 Heat Sink Replacement: step 5, image 2 of 3 iMac Intel 27" EMC 2546 Heat Sink Replacement: step 5, image 3 of 3
    • Remove the spring plate from behind the CPU heat sink.

    • Lift and remove the backing plate from behind the CPU heat sink. The backing plate has two posts that fit into alignment holes in the logic board.

  6. iMac Intel 27" EMC 2546 Heat Sink Replacement: step 6, image 1 of 3 iMac Intel 27" EMC 2546 Heat Sink Replacement: step 6, image 2 of 3 iMac Intel 27" EMC 2546 Heat Sink Replacement: step 6, image 3 of 3
    • Lift the heat sink up from the logic board.

    • The CPU will most likely stick to the heat sink, so be careful about where you put it down.

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

Andrew Optimus Goldheart

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