Service Manual
Table Of Contents
- Latitude 3420 Service Manual
- Working inside your computer
- Removing and installing components
- Recommended tools
- Screw List
- Major components of your system
- MicroSD-card
- SIM card tray
- Base cover
- Battery cable
- Battery
- Memory module
- M.2 solid-state drive thermal plate
- M.2 solid-state drive conversion bracket
- M.2 solid-state drive
- Hard-disk drive
- WLAN card
- WWAN card
- I/O cable
- Display assembly
- System fan
- Heatsink assembly
- Power adapter port
- Coin-cell battery
- USB cable
- Ethernet port
- I/O board
- Power-button board
- System board
- Speakers
- Touchpad
- WWAN I/O board
- Palmrest assembly
- Display bezel
- Display panel
- Camera
- Display cable
- Display back-cover
- Drivers and downloads
- System setup
- Troubleshooting
- Built-in self-test (BIST)
- LCD Built-in Self Test (BIST)
- Dell SupportAssist Pre-boot System Performance Check diagnostics
- Diagnostic LED behavior
- Diagnostic error messages
- System error messages
- Recovering the operating system
- Real-Time Clock (RTC Reset)
- Flashing the BIOS
- Backup media and recovery options
- WiFi power cycle
- Flea power release
- Getting help and contacting Dell
Steps
1. Route the I/O cable through the routing guides and adhere the adhesive tape to secure the I/O cable in place.
2. Adhere the adhesive tape, connect the I/O cable to the connector on the system board, and close the latch.
3. Adhere the adhesive tape, connect the I/O cable to the connector on the I/O board, and close the latch.
Next steps
1. Install the base cover.
2. Exit the service mode
3. Install the microSD-card.
4. Install the SIM card tray for 4G LTE enabled systems.
5. Follow the procedure in after working inside your computer.
Display assembly
Removing the display assembly
Prerequisites
1. Follow the procedure in before working inside your computer.
2. Remove the microSD-card.
3. Remove the SIM card tray for 4G LTE enabled systems.
4. Enter the service mode.
5. Remove the base cover.
6. Remove the M.2 SSD for systems enabled with 4G LTE.
7. Remove the M.2 SSD thermal plate for systems enabled with 4G LTE.
8. Remove the M.2 SSD conversion bracket for systems enabled with 4G LTE.
9. Remove the WLAN card.
Removing and installing components
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