Dell Precision 3580 Owner's Manual page 86

Steps
1. Remove the two screws (M2x3) that secure the display-cable bracket to the palm-rest assembly..
2. Lift the display-cable bracket off the palm-rest assembly.
3. Remove the three screws (M2x4) that secure the Type-C bracket to the palm-rest assembly..
4. Lift the Type-C bracket off the palm-rest assembly.
5. Lift up the black flap near the antenna cables and uncover the sensor board-cable.
86 Removing and installing Field Replaceable Units (FRUs)