iMac Intel 21.5" Retina 4K Display Heat Sink Replacement

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Loosen but do not remove the four captive T8 screws securing the heat sink over the CPU.
Remove the two 5.4 mm T8 screws securing the heat pipe to the logic board.
Some iMac models have a straight heat pipe rather than a curved one—regardless, the screws will be the same size/type and the ones over the CPU will be captive to the heat sink.

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