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 12. System setup options—Passwords menu
Passwords
Master Password Lockout
Enable Master Password Lockout When enabled, this disables the master password support.
By default, the option is disabled.
Allow Non-Admin PSID Revert(For
systems with discrete video card only)
Enable Allow Non-Admin PSID Revert Controls access to the Physical Security ID (PSID) revert of NVMe hard-drives
from the Dell Security Manager prompt.
By default, the option is disabled.
Table 13. System setup options—Update, Recovery menu
Update, Recovery
UEFI Capsule Firmware Updates Enable or disable BIOS updates through UEFI capsule update packages.
By default, the option is enabled.
BIOS Recovery from Hard Drive Enables the user to recover from certain corrupted BIOS conditions from a
recovery file on the user primary hard drive or an external USB key.
By default, the option is enabled.
BIOS Downgrade
Allow BIOS Downgrade Enable or disable the flashing of the system firmware to previous revision is
blocked.
By default, the option is enabled.
SupportAssist OS Recovery Enable or disable the boot flow for SupportAssist OS Recovery tool in the
event of certain system errors.
By default, the option is enabled.
BIOSConnect Enable or disable cloud Service operating system recovery if the main operating
system fails to boot with the number of failures equal to or greater than the
value specified by the Auto operating system Recovery Threshold setup option
and local Service operating system does not boot or is not installed.
By default, the option is enabled.
Dell Auto operating system Recovery
Threshold
Controls the automatic boot flow for SupportAssist System Resolution Console
and for Dell operating system Recovery Tool.
By default, the threshold value is set to 2.
Table 14. System setup options—System Management menu
System Management
Service Tag Display the Service Tag of the system.
Asset Tag Create a system Asset Tag.
AC Behavior
Wake on AC Enable or disable the wake on AC option.
By default, the option is disabled.
Wake on LAN
Wake on LAN Enable or disable the system to power on by special LAN signals when it
receives a wakeup signal from the WLAN.
By default, the Disabled option is selected.
104 System setup