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 11. System setup options—Security menu
Security
By default, the Software Control option is enabled.
SMM Security Mitigation Enable or disable SMM Security Mitigation.
By default, the option is enabled.
Data Wipe on Next Boot
Start Data Wipe Enable or disable the data wipe on next boot.
By default, the option is disabled.
Absolute Enable or disable or permanently disable the BIOS module interface of the
optional Absolute Persistence Module service from Absolute software.
By default, the option is enabled.
UEFI Boot Path Security Controls whether the system will prompt the user to enter the admin password
(if set) when booting to a UEFI boot device from the F12 boot menu.
By default, the Always Except Internal HDD option is enabled.
Table 12. System setup options—Passwords menu
Passwords
Admin Password Set, change, or delete the administrator password.
System Password Set, change, or delete the system password.
Internal HDD-1 Password Set, change, or delete the Internal HDD-1 password.
NVMe SSD0 Set, change, or delete the NVMe SSD0 password.
Password Configuration
Upper Case Letter Reinforces password must have at least one upper case letter.
By default, the option is enabled.
Lower Case Letter Reinforces password must have at least one lower case letter.
By default, the option is enabled.
Digit Reinforces password must have at least one digit.
By default, the option is enabled.
Special Character Reinforces password must have at least one special character.
By default, the option is enabled.
Minimum Characters Set the minimum characters allowed for password.
Password Bypass When enabled, this always prompts for system and internal hard drive
passwords when powered on from the off state.
By default, the Disabled option is selected.
Password Changes
Enable Non-Admin Password Changes Enable or disable to change system and hard drive password without the need
for admin password.
By default, the option is disabled.
Admin Setup Lockout
Enable Admin Setup Lockout Enables administrators control over how their users can or cannot access BIOS
setup.
By default, the option is disabled.
System setup 103