Dell Latitude 3420 Service Manual page 82

Steps
1. Align and place the system board into the slot on the palmrest assembly.
2. Install the two (M2x2) screws to secure the system board in place.
3. Align and place the type-c bracket on the system board.
4. Install the two (M2x5) screws to secure the type-c bracket in place.
5. Connect the display cable and I/O cable to the connector on the system board, close the latches and affix the adhesive
tapes.
6. Connect the touchpad cable, keyboard cable, and USB cable to the connector on the system board and close the latches.
7. Connect the speaker cable, power adapter port cable, hard-disk drive cable, and system fan cable to the connector on the
system board.
8. For 4G LTE enabled systems, affix the WWAN I/O board cable on the palmrest assembly.
9. Press the hinge in downward direction toward the palmrest assembly.
10. Install the (M2.5x6) and the (M2.5x4) screws to secure the hinge to the palmrest assembly.
Next steps
1. Install the heatsink assembly.
2. Install the WLAN card.
3. Install the hard-disk drive
4. Install the M.2 SSD.
5. Install the memory module.
6. Install the battery.
7. Install the base cover.
8. Install the SIM card tray
9. Install the microSD-card.
10. Follow the procedure in
82 Removing and installing components
for systems shipped with hard-disk drive.
for 4G LTE enabled systems.
after working inside your computer.