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iMac Intel 21.5" EMC 2308 Heat Sink Replacement

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

Five 6.5 mm T8 Torx

One 7 mm T10 Torx

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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