Dell XPS 15 9520 Service Manual - Page 4

Installing the display assembly...39 System board...42 Removing the system board...42 Installing the system board...45 LED board...49 Removing the LED board...49 Installing the LED board...50 Palm-rest and keyboard assembly...51 Removing the palm-rest and keyboard assembly 51 Installing the palm-rest and keyboard assembly 52 Chapter 3: Drivers and downloads 54 Chapter 4: System setup...55 Entering BIOS setup program...55 Navigation keys...55 Boot Sequence...55 One time boot menu...56 System setup options...56 System and setup password...65 Assigning a system setup password...66 Deleting or changing an existing system setup password 66 Clearing CMOS settings...67 Clearing BIOS (System Setup) and System passwords 67 Updating the BIOS...67 Updating the BIOS in Windows...67 Updating the BIOS using the USB drive in Windows 67 Updating the BIOS from the F12 One-Time boot menu 68 Chapter 5: Troubleshooting...69 Handling swollen Lithium-ion batteries...69 Locate the Service Tag or Express Service Code of your Dell computer 69 System diagnostic lights...70 SupportAssist diagnostics...71 Built-in self-test (BIST)...71 M-BIST...71 LCD Built-in Self Test (BIST)...72 Recovering the operating system...72 WiFi power cycle...72 Drain residual flea power (perform hard reset)...73 Backup media and recovery options...73 Real Time Clock-RTC reset...73 Chapter 6: Getting help and contacting Dell 75 4 Contents