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
Touchpad ............................................................................................................................................................................75
Removing the touchpad.............................................................................................................................................75
Installing the touchpad............................................................................................................................................... 76
WWAN I/O board ............................................................................................................................................................. 77
Removing the WWAN I/O board..............................................................................................................................77
Installing the WWAN I/O board................................................................................................................................77
Palmrest assembly.............................................................................................................................................................78
Removing the palmrest assembly............................................................................................................................ 78
Installing the palmrest assembly.............................................................................................................................. 79
Display bezel........................................................................................................................................................................81
Removing the display bezel....................................................................................................................................... 81
Installing the display bezel.........................................................................................................................................82
Display panel....................................................................................................................................................................... 83
Removing the display panel.......................................................................................................................................83
Installing the display panel.........................................................................................................................................86
Camera.................................................................................................................................................................................89
Removing the camera ............................................................................................................................................... 89
Installing the camera ................................................................................................................................................. 89
Display cable.......................................................................................................................................................................90
Removing the display cable ..................................................................................................................................... 90
Installing the display cable ........................................................................................................................................ 91
Display back-cover............................................................................................................................................................93
Removing the display back-cover........................................................................................................................... 93
Installing the display back-cover..............................................................................................................................93
Chapter 3: Drivers and downloads............................................................................................... 95
Chapter 4: System setup.............................................................................................................96
Boot menu...........................................................................................................................................................................96
Boot Sequence...................................................................................................................................................................96
Navigation keys..................................................................................................................................................................97
System setup options....................................................................................................................................................... 97
Updating the BIOS in Windows ................................................................................................................................... 107
Updating BIOS on systems with BitLocker enabled.......................................................................................... 107
Updating your system BIOS using a USB flash drive........................................................................................ 107
System and setup password......................................................................................................................................... 108
Assigning a system setup password......................................................................................................................108
Deleting or changing an existing system setup password............................................................................... 109
Chapter 5: Troubleshooting........................................................................................................110
Built-in self-test (BIST).................................................................................................................................................. 110
LCD Built-in Self Test (BIST)........................................................................................................................................ 110
Dell SupportAssist Pre-boot System Performance Check diagnostics................................................................111
Running the SupportAssist Pre-Boot System Performance Check................................................................111
Diagnostic LED behavior.................................................................................................................................................112
Diagnostic error messages............................................................................................................................................. 113
System error messages...................................................................................................................................................116
Recovering the operating system.................................................................................................................................116
Real-Time Clock (RTC Reset)....................................................................................................................................... 117
Contents
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