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 14. System setup options—System Management menu
System Management
Auto on Time Enable to set the system to turn on automatically every day or on a preselected
date and time. This option can be configured only if the Auto On Time is set to
Everyday, Weekdays, or Selected Days.
By default, the option is disabled.
Table 15. System setup options—Keyboard menu
Keyboard
Numlock Options By default, the Numlock option is enabled.
Fn Lock Options By default, the Fn lock option is enabled.
Lock Mode By default, Lock Mode Secondary is enabled.
Keyboard Illumination Enables to change the keyboard illumination settings.
By default, the Bright option is enabled.
Keyboard Backlight Timeout on AC Set the timeout value for the keyboard backlight when an AC adapter is
connected to the system.
By default, the 1 minute option is enabled.
Keyboard Backlight Timeout on
Battery
Set the timeout value for the keyboard backlight when the is running only on
battery power.
By default, the 1 minute option is enabled.
Table 16. System setup options—Pre-boot Behavior menu
Pre-boot Behavior
Adapter Warnings
Enable Adapter Warnings Enable or disable the warning messages during boot when the adapters with
less power capacity are detected.
By default, the option is enabled.
Warning and Errors Enable or disable the action to be done when a warning or error is encountered.
By default, the Prompt on Warnings and Errors option is enabled.
USB-C Warnings
Enable Dock Warning Messages
By default, the option is enabled.
Fastboot Enable to set the speed of the boot process.
By default, the Thorough option is enabled.
Extend BIOS POST Time Set the BIOS POST time.
By default, the 0 seconds option is enabled.
MAC Address Pass-Through Replaces the external NIC MAC address with the selected MAC address from
the system.
By default, the System Unique MAC Address option is enabled.
Table 17. System setup options—Virtualization menu (continued)
Virtualization
Intel Virtualization Technology
Enable Intel Virtualization Technology
(VT)
Specify whether a Virtual Machine Monitor (VMM) can use the additional
hardware capabilities that are provided by Intel Virtualization Technology.
System setup 105