Dell Latitude 9420 Service Manual page 4

Removing the right speaker......................................................................................................................................39
Installing the right speaker........................................................................................................................................ 40
Wireless Local Area Network (WLAN) Antenna module......................................................................................... 40
Removing the WLAN antenna module................................................................................................................... 40
Installing the WLAN antenna module...................................................................................................................... 41
I/O daughter board........................................................................................................................................................... 43
Removing the I/O daughter board.......................................................................................................................... 43
Installing the I/O daughter board............................................................................................................................ 44
Power button with fingerprint reader assembly........................................................................................................ 45
Removing the power button with fingerprint reader assembly ...................................................................... 45
Installing the power button with fingerprint reader assembly .........................................................................46
System board..................................................................................................................................................................... 46
Removing the system board..................................................................................................................................... 46
Installing the system board....................................................................................................................................... 49
USH daughter board......................................................................................................................................................... 51
Removing the USH daughter board.........................................................................................................................51
Installing the USH daughter board.......................................................................................................................... 52
Wireless Wide Area Network (WWAN) Antenna module........................................................................................ 53
Removing the WWAN main antenna module........................................................................................................53
Installing the WWAN main antenna module.......................................................................................................... 54
Palm-rest assembly.......................................................................................................................................................... 55
Removing the palm-rest assembly.......................................................................................................................... 55
Installing the palm-rest assembly............................................................................................................................ 56
Chapter 3: Software....................................................................................................................58
Downloading the drivers..................................................................................................................................................58
Chapter 4: BIOS setup.................................................................................................................59
BIOS overview................................................................................................................................................................... 59
Entering BIOS setup program........................................................................................................................................ 59
Navigation keys................................................................................................................................................................. 59
One time boot menu.........................................................................................................................................................60
System setup options.......................................................................................................................................................60
Updating the BIOS............................................................................................................................................................ 70
Updating the BIOS in Windows................................................................................................................................ 70
Updating the BIOS in Linux and Ubuntu................................................................................................................ 70
Updating the BIOS using the USB drive in Windows..........................................................................................70
Updating the BIOS from the F12 One-Time boot menu......................................................................................71
System and setup password...........................................................................................................................................72
Assigning a system setup password....................................................................................................................... 72
Deleting or changing an existing system setup password................................................................................. 72
Clearing BIOS (System Setup) and System passwords...........................................................................................73
Chapter 5: Troubleshooting......................................................................................................... 74
Handling swollen Lithium-ion batteries........................................................................................................................ 74
Dell SupportAssist Pre-boot System Performance Check diagnostics................................................................75
Running the SupportAssist Pre-Boot System Performance Check................................................................ 75
Built-in self-test (BIST)................................................................................................................................................... 75
M-BIST........................................................................................................................................................................... 75
4 Contents