Dell Latitude 7420 Service Manual page 4

Installing the audio board........................................................................................................................................... 41
Speakers.............................................................................................................................................................................. 42
Removing the speakers..............................................................................................................................................42
Installing the speaker.................................................................................................................................................. 43
SmartCard reader..............................................................................................................................................................44
Removing the smart card reader............................................................................................................................. 44
Installing the smart card reader............................................................................................................................... 46
System board......................................................................................................................................................................47
Removing the system board..................................................................................................................................... 47
Installing the system board....................................................................................................................................... 49
I/O board.............................................................................................................................................................................52
Removing the I/O board............................................................................................................................................52
Installing the I/O board.............................................................................................................................................. 52
Power button with fingerprint reader.......................................................................................................................... 53
Removing the power button with fingerprint reader..........................................................................................53
Installing the power button with fingerprint reader............................................................................................54
Keyboard............................................................................................................................................................................. 55
Removing the keyboard............................................................................................................................................. 55
Installing the keyboard............................................................................................................................................... 57
Palmrest assembly............................................................................................................................................................ 59
Removing the palmrest assembly............................................................................................................................59
Installing the palmrest assembly.............................................................................................................................. 60
Chapter 3: Software.................................................................................................................... 62
Downloading Windows drivers....................................................................................................................................... 62
Chapter 4: System setup............................................................................................................. 63
BIOS overview................................................................................................................................................................... 63
Entering BIOS setup program........................................................................................................................................ 63
Boot menu..................................................................................................................................................................... 63
Navigation keys..................................................................................................................................................................64
Boot Sequence...................................................................................................................................................................64
System setup options.......................................................................................................................................................64
Updating the BIOS in Windows .....................................................................................................................................74
Updating BIOS on systems with BitLocker enabled............................................................................................75
Updating your system BIOS using a USB flash drive..........................................................................................75
System and setup password...........................................................................................................................................76
Assigning a system setup password....................................................................................................................... 76
Deleting or changing an existing system setup password................................................................................. 77
Clearing BIOS (System Setup) and System passwords...........................................................................................77
Chapter 5: Troubleshooting......................................................................................................... 78
Recovering the operating system..................................................................................................................................78
Backup media and recovery options............................................................................................................................. 78
Dell SupportAssist Pre-boot System Performance Check diagnostics................................................................78
Running the SupportAssist Pre-Boot System Performance Check................................................................ 79
Diagnostic LED behavior..................................................................................................................................................79
Real-Time Clock (RTC Reset)........................................................................................................................................80
Flashing BIOS (USB key)................................................................................................................................................. 81
4 Contents