Dell Precision 3520 Owner's Manual page 28

e WWAN card
f SSD card or hard drive
g memory module
h heat sink assembly
i coin cell battery
j Power connector port
k chassis frame
3 To release the system board:
a Remove the M2.0x3.0 screws that secures the metal bracket [1].
b Lift the metal bracket that secures the display cable [2].
c Disconnect the display cable from the connectors on the system board [3].
d Disconnect the power cable [4].
4 To remove the system board:
a Disconnect the LED board, mother board and touchpad cable from the system board [1].
b Remove the M2.0x5.0 screws that secure the metal bracket and lift it away from the system board [2,3].
NOTE:
28 Removing and installing components
The metal bracket referred is the USB-C port bracket.