System board..................................................................................................................................................................... 36
Removing the system board..................................................................................................................................... 36
Installing the system board....................................................................................................................................... 38
Palm-rest and keyboard assembly................................................................................................................................. 41
Removing the palm-rest and keyboard assembly.................................................................................................41
Installing the palm-rest and keyboard assembly.................................................................................................. 42
Recommended tools......................................................................................................................................................... 42
Screw list.............................................................................................................................................................................43
Major components of Inspiron 14 3420........................................................................................................................45
Chapter 3: Drivers and downloads............................................................................................... 47
Chapter 4: BIOS setup.................................................................................................................48
Navigation keys..................................................................................................................................................................48
System setup options.......................................................................................................................................................48
Updating the BIOS............................................................................................................................................................ 49
Updating the BIOS in Windows................................................................................................................................49
Updating the BIOS using the USB drive in Windows......................................................................................... 50
Updating the BIOS from the F12 One-Time boot menu.................................................................................... 50
System and setup password........................................................................................................................................... 51
Assigning a system setup password........................................................................................................................51
Deleting or changing an existing system setup password.................................................................................52
Clearing BIOS (System Setup) and System passwords.......................................................................................... 52
Chapter 5: Troubleshooting.........................................................................................................53
Handling swollen Lithium-ion batteries........................................................................................................................ 53
Built-in self-test (BIST)................................................................................................................................................... 53
LCD Power rail test (L-BIST)................................................................................................................................... 53
LCD Built-in Self Test (BIST)................................................................................................................................... 54
System-diagnostic lights................................................................................................................................................. 54
Backup media and recovery options.............................................................................................................................55
WiFi power cycle............................................................................................................................................................... 55
Drain residual flea power (perform hard reset)......................................................................................................... 55
Chapter 6: Getting help and contacting Dell................................................................................ 56
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