Inspiron 15 5000 Service Manual

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Procedure

Place the heat sink on the system board and align the screw holes on the heat sink with the screw holes on the system board.
Tighten the captive screws in the reverse order (4->3->2->1) to secure the heat sink to the system board.
In computers that are shipped with discrete graphics card, replace the three (M2x3) screws that secure the heat sink to the system board.