Dell XPS 15 9520 Service Manual page 4

Removing the display assembly............................................................................................................................... 39
Installing the display assembly.................................................................................................................................. 41
System board..................................................................................................................................................................... 44
Removing the system board..................................................................................................................................... 44
Installing the system board....................................................................................................................................... 47
LED board............................................................................................................................................................................ 51
Removing the LED board........................................................................................................................................... 51
Installing the LED board.............................................................................................................................................52
Palm-rest and keyboard assembly................................................................................................................................ 53
Removing the palm-rest and keyboard assembly................................................................................................ 53
Installing the palm-rest and keyboard assembly.................................................................................................. 54
Chapter 3: Drivers and downloads............................................................................................... 56
Chapter 4: System setup............................................................................................................. 57
Entering BIOS setup program........................................................................................................................................ 57
Navigation keys..................................................................................................................................................................57
Boot Sequence...................................................................................................................................................................57
One time boot menu.........................................................................................................................................................58
System setup options.......................................................................................................................................................58
System and setup password...........................................................................................................................................68
Assigning a system setup password....................................................................................................................... 68
Deleting or changing an existing system setup password.................................................................................69
Clearing CMOS settings............................................................................................................................................ 69
Clearing BIOS (System Setup) and System passwords.....................................................................................70
Updating the BIOS............................................................................................................................................................ 70
Updating the BIOS in Windows................................................................................................................................ 70
Updating the BIOS using the USB drive in Windows..........................................................................................70
Updating the BIOS from the F12 One-Time boot menu.....................................................................................70
Chapter 5: Troubleshooting......................................................................................................... 72
Handling swollen Lithium-ion batteries........................................................................................................................ 72
Locate the Service Tag or Express Service Code of your Dell computer ..............................................72
System diagnostic lights.................................................................................................................................................. 73
SupportAssist diagnostics............................................................................................................................................... 74
Built-in self-test (BIST)................................................................................................................................................... 74
M-BIST........................................................................................................................................................................... 74
LCD Built-in Self Test (BIST)................................................................................................................................... 75
Recovering the operating system................................................................................................................................. 75
WiFi power cycle............................................................................................................................................................... 75
Drain residual flea power (perform hard reset)......................................................................................................... 76
Backup media and recovery options............................................................................................................................. 76
Real Time Clock-RTC reset..........................................................................................................................................76
Chapter 6: Getting help and contacting Dell................................................................................ 78
4 Contents