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iMac Intel 21.5" EMC 2428 CPU Heat Sink Replacement

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Remove the following five screws securing the heat sink to the logic board:

Four 6.4 mm T8 Torx screws

One 4.3 mm T10 Torx screw

It may be necessary to hold the socket with a Phillips screwdriver on one side of the board while you unscrew the Torx screw on the other side of the board.

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