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
About this task
The following images indicate the location of the heatsink assembly and provide a visual representation of the removal
procedure.
NOTE: The following images are from systems shipped with discrete graphic card. The system board has a different
configuration for integrated graphic cards.
Steps
1. For systems enabled with integrated graphic card, loosen the four captive screws (in reverse order, 4->3->2->1) that secure
the heatsink assembly to the system board.
2. For systems enabled with discrete graphic card, loosen the seven captive screws (in reverse order, 7>6>5>4->3->2->1) that
secure the heatsink assembly to the system board.
3. Lift and remove the heatsink assembly from the system board.
Installing the heatsink assembly
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the heatsink assembly and provides a visual representation of the installation
procedure.
NOTE:
The following images are from systems shipped with discrete graphic card. The system board has a different
configuration for integrated graphic cards.
54 Removing and installing components