Dell Vostro 15-3572 Owner's Manual page 24

b. Optical drive
c. Keyboard
d. Base cover
3. To remove the heat sink:
a. Remove the screws that secure the heat sink to the system board.
NOTE: Loosen the screws in the order of the callout numbers [1, 2, 3, 4] on the heat sink.
b. Remove the heat sink from the system board.
24 Disassembly and reassembly