Dell Inspiron 14 Plus 7420 Service Manual - Page 4

Power-button board...39 Removing the power-button board...39 Installing the power-button board...40 Power button with optional fingerprint reader...41 Removing the power button with optional fingerprint reader 41 Installing the power button with optional fingerprint reader 42 System board...43 Removing the system board...43 Installing the system board...46 Speakers...48 Removing the speakers...48 Installing the speakers...49 Palm-rest and keyboard assembly...50 Removing the palm-rest and keyboard assembly 50 Installing the palm-rest and keyboard assembly 51 Chapter 3: Drivers and downloads 53 Chapter 4: System setup...54 BIOS overview...54 Entering BIOS setup program...54 Navigation keys...54 Boot Sequence...55 System setup options...55 System and setup password...59 Assigning a system setup password...59 Deleting or changing an existing system setup password 60 Clearing BIOS (System Setup) and System passwords 60 Updating the BIOS...61 Updating the BIOS in Windows...61 Updating the BIOS using the USB drive in Windows 61 Updating the BIOS from the F12 One-Time boot menu 61 Chapter 5: Troubleshooting...63 Handling swollen Lithium-ion batteries...63 Locate the Service Tag or Express Service Code of your Dell computer 63 System-diagnostic lights...64 SupportAssist | On-board Diagnostics...65 Recovering the operating system...65 WiFi power cycle...65 Chapter 6: Getting help and contacting Dell 67 4 Contents