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Inspiron 14 3420 Service Manual
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Notes, cautions, and warnings
Working inside your computer
Safety instructions
Before working inside your computer
Safety precautions
Electrostatic discharge—ESD protection
ESD field service kit
Transporting sensitive components
After working inside your computer
BitLocker
Removing and installing components
Base cover
Removing the base cover
Installing the base cover
M.2 solid-state drive
Removing the M.2 2230 solid-state drive
Installing the M.2 2230 solid-state drive
Removing the M.2 2280 solid-state drive
Installing the M.2 2280 solid-state drive
Battery
Rechargeable Li-ion battery precautions
Removing the battery
Installing the battery
Display assembly
Removing the display assembly
Installing the display assembly
Heat sink
Removing the heat sink
Installing the heat sink
Speakers
Removing the speakers
Installing the speakers
Touchpad assembly
Removing the touchpad assembly
Installing the touchpad assembly
I/O board
Removing the I/O board
Installing the I/O board
I/O board cable
Removing the I/O board cable
Installing the I/O board cable
Power button
Removing the power button
Installing the power button
System board
Removing the system board
Installing the system board
Palm-rest and keyboard assembly
Removing the palm-rest and keyboard assembly
Installing the palm-rest and keyboard assembly
Recommended tools
Screw list
Major components of Inspiron 14 3420
Drivers and downloads
BIOS setup
Navigation keys
System setup options
Updating the BIOS
Updating the BIOS in Windows
Updating the BIOS using the USB drive in Windows
Updating the BIOS from the F12 One-Time boot menu
System and setup password
Assigning a system setup password
Deleting or changing an existing system setup password
Clearing BIOS (System Setup) and System passwords
Troubleshooting
Handling swollen rechargeable Li-ion batteries
Built-in self-test (BIST)
LCD Power rail test (L-BIST)
LCD Built-in Self Test (BIST)
System-diagnostic lights
Backup media and recovery options
Wi-Fi power cycle
Drain residual flea power (perform hard reset)
Getting help and contacting Dell
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Clearing BIOS (System Setup) and System passwords
About this task
To clear the system or BIOS passwords, contact Dell technical support as described at
www.dell.com/contactdell
.
NOTE:
For information on how to reset Windows or application passwords, refer to the documentation accompanying Windows or your application.
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