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. Align and place the coin-cell battery on the palmrest assembly.
2. Connect the coin-cell battery cable to the connector on the I/O board.
Next steps
1. Install the WWAN I/O boardfor systems shipped with integrated graphic card and enabled with 4G LTE.
2. Install the WWAN card for systems shipped with integrated graphic card and enabled with 4G LTE.
3. Install the M.2 SSD conversion bracketfor systems shipped with discrete graphic card.
4. Install the M.2 SSD thermal platefor systems shipped with discrete graphic card.
5. Install the M.2 SSD for systems shipped with discrete graphic card.
6. Install the base cover.
7. Exit the service mode
8. Install the SIM card tray for 4G LTE enabled systems.
9. Install the microSD-card.
10. Follow the procedure in after working inside your computer.
USB cable
Removing the USB cable
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. Remove the base cover.
5. Remove the battery.
6. Remove the hard-disk drive.
About this task
The following image indicates the location of the USB cable and provides a visual representation of the removal procedure.
Removing and installing components
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