Dell Latitude 5424 Rugged Owner's Manual page 157

2 Connect the FPC to the system board [1] and secure it using a piece of insulation tape [2].
3 Connect the speaker cable to the left I/O daughterboard [3].
4 Install the:
a Battery bay
b PCIe Heatsink fan assembly
c Bottom chassis cover
d Batteries
5 Follow the procedure in After working inside your computer.
Removing and installing components 157