Dell Latitude 7490 Owner's Manual page 48

h. system board
i. power connector port
j. coin cell battery
k. speaker
The component you are left with is the palm rest.
3. Replace the palm rest.
4. Install the:
a. speaker
b. coin cell battery
c. power connector port
d. system board
e. heat sink
f. WLAN card
g. WWAN card
h. PCIe SSD card
i. memory module
j. battery
k. base cover
5. Follow the procedure in
48 Removing and installing components
After working inside your computer.