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
Table 1. Screw list
Component Screw type Quantity Image
Hard disk-drive module
Captive screws
3
Hard disk-drive M3x3 4
WLAN card M2x3 1
WWAN card M2x3 1
Display hinges M2.5x6
M2.5x4
3
2
System Fan M2x3 2
Heatsink assembly
Captive screws
7 (For systems
enabled with
discrete graphic
card)
4 (For systems
enabled with
integrated graphic
card)
Power adapter port M2x3 1
Ethernet port M2x5 1
I/O board M2x3 2
System board M2x5 2
Touchpad bracket M2.5x2 3
Touchpad module M2x2 4
WWAN I/O board M2x3 2
Hinge bracket M2.5x2.5
M2.5x3
6
2
Removing and installing components 13