Service Manual
Table Of Contents
- Latitude 5420 Service Manual
- Contents
- Working inside your computer
- Major components of your computer
- Removing and installing components
- Recommended tools
- Screw list
- Disassembly and reassembly
- Subscriber Identity Module (SIM) card
- Micro Secure Digital (SD) Card
- Base cover
- WLAN card
- WWAN card
- Solid-state drive
- Memory modules
- Battery
- Battery cable
- Assembly inner frame
- LED board
- Heat sink
- Speakers
- System board
- Power-button board
- Smart card reader
- Keyboard assembly
- Keyboard bracket
- Display assembly
- Display bezel
- Display panel
- Camera/microphone module
- eDP/display cable
- Sensor board
- Display hinges
- Display back cover
- Dummy SIM-card slot filler
- Palm-rest assembly
- Software
- BIOS setup
- Troubleshooting
- Getting help and contacting Dell
Operating system.............................................................................................................................................................. 86
Downloading the drivers.................................................................................................................................................. 86
Chapter 5: BIOS setup.................................................................................................................87
BIOS overview....................................................................................................................................................................87
Entering BIOS setup program........................................................................................................................................ 87
Navigation keys..................................................................................................................................................................87
One time boot menu.........................................................................................................................................................88
System setup options.......................................................................................................................................................88
Updating the BIOS............................................................................................................................................................ 98
Updating the BIOS in Windows................................................................................................................................98
Updating the BIOS in Linux and Ubuntu................................................................................................................ 98
Updating the BIOS using the USB drive in Windows..........................................................................................98
Updating the BIOS from the F12 One-Time boot menu.................................................................................... 99
System and setup password.........................................................................................................................................100
Assigning a system setup password..................................................................................................................... 100
Deleting or changing an existing system setup password............................................................................... 100
Clearing BIOS (System Setup) and System passwords..........................................................................................101
Chapter 6: Troubleshooting....................................................................................................... 102
Handling swollen Lithium-ion batteries.......................................................................................................................102
Dell SupportAssist Pre-boot System Performance Check diagnostics.............................................................. 103
Running the SupportAssist Pre-Boot System Performance Check.............................................................. 103
Built-in self-test (BIST)..................................................................................................................................................103
M-BIST......................................................................................................................................................................... 103
LCD Power rail test (L-BIST)................................................................................................................................. 104
LCD Built-in Self Test (BIST)................................................................................................................................. 104
System diagnostic lights................................................................................................................................................ 105
Recovering the operating system................................................................................................................................106
Backup media and recovery options........................................................................................................................... 106
WiFi power cycle..............................................................................................................................................................106
Drain residual flea power (perform hard reset)........................................................................................................107
Chapter 7: Getting help and contacting Dell...............................................................................108
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