Dell Inspiron 7405 2n1 Service Manual page 4

Installing the fan.............................................................................................................................................................36
I/O board.............................................................................................................................................................................. 36
Removing the I/O board...............................................................................................................................................36
Installing the I/O board................................................................................................................................................. 37
Power button with fingerprint reader...............................................................................................................................38
Removing the power-button board.............................................................................................................................38
Installing the power-button board............................................................................................................................... 39
Display assembly..................................................................................................................................................................40
Removing the display assembly................................................................................................................................... 40
Installing the display assembly......................................................................................................................................43
System board.......................................................................................................................................................................45
Removing the system board........................................................................................................................................ 45
Installing the system board........................................................................................................................................... 47
Palm-rest and keyboard assembly.................................................................................................................................... 49
Removing the palm-rest and keyboard assembly......................................................................................................49
Installing the palm-rest and keyboard assembly........................................................................................................50
3 Drivers and downloads................................................................................................................ 52
4 System setup.............................................................................................................................53
Entering BIOS setup program............................................................................................................................................53
Navigation keys....................................................................................................................................................................53
Boot Sequence.................................................................................................................................................................... 53
One time boot menu........................................................................................................................................................... 54
System setup options......................................................................................................................................................... 54
Clearing CMOS settings..................................................................................................................................................... 58
Clearing BIOS (System Setup) and System passwords.................................................................................................58
5 Troubleshooting.........................................................................................................................59
Enhanced Pre-Boot System Assessment (ePSA) diagnostics......................................................................................59
Running the SupportAssist Pre-Boot System Performance Check....................................................................... 59
System diagnostic lights.....................................................................................................................................................59
Recovering the operating system..................................................................................................................................... 60
Flashing the BIOS.................................................................................................................................................................61
Flashing BIOS (USB key).................................................................................................................................................... 61
Backup media and recovery options..................................................................................................................................61
WiFi power cycle.................................................................................................................................................................. 61
Flea power release...............................................................................................................................................................62
6 Getting help and contacting Dell..................................................................................................63
4 Contents