Dell XPS 14 9440 Owner's Manual page 54

Steps
1. Align and place the heat-sink assembly on the palm-rest assembly.
2. In sequential order (1>2>3) as indicated on the heat-sink assembly, tighten the three captive screws that secure the
heat-sink assembly to the system board.
3. Align the screw holes of the heat-sink assembly with the screw holes of the system board.
4. Replace the four screws (M1.6x3) that secure the left and right fans to the palm-rest assembly.
5. Connect the left fan cable (JFAN1) and right fan cable (JFAN2) to the system board.
Next steps
1. Install the base cover.
2. Follow the procedure in After working inside your computer.
54 Removing and installing Field Replaceable Units (FRUs)