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
DELL 5420 User Manual
Displayed below is the user manual for 5420 by DELL which is a product in the Notebooks category. This manual has pages.
Related Manuals
Latitude 5420
Service Manual
Regulatory Model: P137G
Regulatory Type: P137G001,P137G002
August 2021
Rev. A01
Notes, cautions, and warnings
NOTE: A NOTE indicates important information that helps you make better use of your product.
CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid
the problem.
WARNING: A WARNING indicates a potential for property damage, personal injury, or death.
© 2021 Dell Inc. or its subsidiaries. All rights reserved. Dell, EMC, and other trademarks are trademarks of Dell Inc. or its subsidiaries. Other
trademarks may be trademarks of their respective owners.
Chapter 1: Working inside your computer...................................................................................... 5
Before working inside your computer.............................................................................................................................5
Safety precautions.............................................................................................................................................................. 5
Enter service mode............................................................................................................................................................. 6
Electrostatic discharge—ESD protection..................................................................................................................... 8
ESD field service kit ...........................................................................................................................................................9
After working inside your computer................................................................................................................................9
Chapter 2: Major components of your computer........................................................................... 11
Chapter 3: Removing and installing components.......................................................................... 14
Recommended tools..........................................................................................................................................................14
Screw list..............................................................................................................................................................................14
Disassembly and reassembly .......................................................................................................................................... 15
Subscriber Identity Module (SIM) card.................................................................................................................. 15
Micro Secure Digital (SD) Card................................................................................................................................ 17
Base cover..................................................................................................................................................................... 19
WLAN card....................................................................................................................................................................22
WWAN card.................................................................................................................................................................. 25
Solid-state drive...........................................................................................................................................................27
Memory modules.......................................................................................................................................................... 31
Battery........................................................................................................................................................................... 32
Battery cable................................................................................................................................................................ 36
Assembly inner frame................................................................................................................................................. 38
LED board.......................................................................................................................................................................41
Heat sink........................................................................................................................................................................43
Speakers........................................................................................................................................................................ 45
System board................................................................................................................................................................47
Power-button board....................................................................................................................................................51
Smart card reader....................................................................................................................................................... 53
Keyboard assembly..................................................................................................................................................... 55
Keyboard bracket........................................................................................................................................................ 57
Display assembly..........................................................................................................................................................59
Display bezel................................................................................................................................................................. 63
Display panel.................................................................................................................................................................65
Camera/microphone module.................................................................................................................................... 72
eDP/display cable........................................................................................................................................................73
Sensor board.................................................................................................................................................................76
Display hinges............................................................................................................................................................... 77
Display back cover...................................................................................................................................................... 80
Dummy SIM-card slot filler........................................................................................................................................ 81
Palm-rest assembly.....................................................................................................................................................84
Chapter 4: Software.................................................................................................................... 86
Contents
Contents 3
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
4Contents
Working inside your computer
Topics:
•Before working inside your computer
•Safety precautions
•Enter service mode
•Electrostatic discharge—ESD protection
•ESD field service kit
•After working inside your computer
Before working inside your computer
About this task
NOTE: The images in this document may differ from your computer depending on the configuration you ordered.
Steps
1. Save and close all open files and exit all open applications.
2. Shut down your computer. Click Start > Power > Shut down.
NOTE: If you are using a different operating system, see the documentation of your operating system for shut-down
instructions.
3. Disconnect your computer and all attached devices from their electrical outlets.
4. Disconnect all attached network devices and peripherals, such as keyboard, mouse, and monitor from your computer.
CAUTION: To disconnect a network cable, first unplug the cable from your computer and then unplug the
cable from the network device.
5. Remove any media card and optical disc from your computer, if applicable.
Safety precautions
The safety precautions chapter details the primary steps to be taken before performing any disassembly instructions.
Observe the following safety precautions before you perform any installation or break/fix procedures involving disassembly or
reassembly:
●Turn off the system and all attached peripherals.
●Disconnect the system and all attached peripherals from AC power.
●Disconnect all network cables, telephone, and telecommunications lines from the system.
●Use an ESD field service kit when working inside any notebook to avoid electrostatic discharge (ESD) damage.
●After removing any system component, carefully place the removed component on an anti-static mat.
●Wear shoes with non-conductive rubber soles to reduce the chance of getting electrocuted.
Standby power
Dell products with standby power must be unplugged before you open the case. Systems that incorporate standby power are
essentially powered while turned off. The internal power enables the system to be remotely turned on (wake on LAN) and
suspended into a sleep mode and has other advanced power management features.
1
Working inside your computer 5
Unplugging, pressing and holding the power button for 20 seconds should discharge residual power in the system board.
Remove the battery from notebooks.
Bonding
Bonding is a method for connecting two or more grounding conductors to the same electrical potential. This is done through
the use of a field service electrostatic discharge (ESD) kit. When connecting a bonding wire, ensure that it is connected to bare
metal and never to a painted or non-metal surface. The wrist strap should be secure and in full contact with your skin, and
ensure that you remove all jewelry such as watches, bracelets, or rings prior to bonding yourself and the equipment.
Enter service mode
Service Mode allows you to immediately cut the power from the computer without disconnecting the battery cable or removing
the battery from the computer.
Steps
1. Shut down the computer and disconnect the AC adapter from the computer.
2. Press and hold the <B> key on the keyboard, and then press the power button for 3 seconds until the Dell logo appears on
the screen.
The computer restarts and the following screed in displayed.
6Working inside your computer
3. Press any key to continue.
NOTE: The Service Mode procedure automatically skips this step if the Owner Tag of the system is not set up in
advance by the manufacturer.
4. When the ready-to-proceed message appears on the screen, press any key to proceed. The system emits three short beeps
and shuts down immediately.
NOTE: If the AC adapter has not been disconnected, a message prompting you to remove the AC adapter appears on
the screen. Remove the AC adapter and then press any key to continue the Service Mode procedure.
Working inside your computer 7
Once the system shuts down, you can perform the replacement procedures without disconnecting the battery cable from
the system board.
5. To exit Service Mode after finishing replacement procedures, connect AC adapter and press the power button to power on
the system. The system automatically returns to normal functioning mode.
Electrostatic discharge—ESD protection
ESD is a major concern when you handle electronic components, especially sensitive components such as expansion cards,
processors, memory DIMMs, and system boards. Very slight charges can damage circuits in ways that may not be obvious, such
as intermittent problems or a shortened product life span. As the industry pushes for lower power requirements and increased
density, ESD protection is an increasing concern.
Due to the increased density of semiconductors used in recent Dell products, the sensitivity to static damage is now higher than
in previous Dell products. For this reason, some previously approved methods of handling parts are no longer applicable.
Two recognized types of ESD damage are catastrophic and intermittent failures.
●Catastrophic – Catastrophic failures represent approximately 20 percent of ESD-related failures. The damage causes
an immediate and complete loss of device functionality. An example of catastrophic failure is a memory DIMM that has
received a static shock and immediately generates a "No POST/No Video" symptom with a beep code emitted for missing or
nonfunctional memory.
●Intermittent – Intermittent failures represent approximately 80 percent of ESD-related failures. The high rate of
intermittent failures means that most of the time when damage occurs, it is not immediately recognizable. The DIMM
receives a static shock, but the tracing is merely weakened and does not immediately produce outward symptoms related to
the damage. The weakened trace may take weeks or months to melt, and in the meantime may cause degradation of memory
integrity, intermittent memory errors, etc.
The more difficult type of damage to recognize and troubleshoot is the intermittent (also called latent or "walking wounded")
failure.
Perform the following steps to prevent ESD damage:
●Use a wired ESD wrist strap that is properly grounded. The use of wireless anti-static straps is no longer allowed; they do not
provide adequate protection. Touching the chassis before handling parts does not ensure adequate ESD protection on parts
with increased sensitivity to ESD damage.
●Handle all static-sensitive components in a static-safe area. If possible, use anti-static floor pads and workbench pads.
●When unpacking a static-sensitive component from its shipping carton, do not remove the component from the anti-static
packing material until you are ready to install the component. Before unwrapping the anti-static packaging, ensure that you
discharge static electricity from your body.
●Before transporting a static-sensitive component, place it in an anti-static container or packaging.
8Working inside your computer
ESD field service kit
The unmonitored Field Service kit is the most commonly used service kit. Each Field Service kit includes three main components:
anti-static mat, wrist strap, and bonding wire.
Components of an ESD field service kit
The components of an ESD field service kit are:
●Anti-Static Mat – The anti-static mat is dissipative and parts can be placed on it during service procedures. When using an
anti-static mat, your wrist strap should be snug and the bonding wire should be connected to the mat and to any bare metal
on the system being worked on. Once deployed properly, service parts can be removed from the ESD bag and placed directly
on the mat. ESD-sensitive items are safe in your hand, on the ESD mat, in the system, or inside a bag.
●Wrist Strap and Bonding Wire – The wrist strap and bonding wire can be either directly connected between your wrist
and bare metal on the hardware if the ESD mat is not required, or connected to the anti-static mat to protect hardware that
is temporarily placed on the mat. The physical connection of the wrist strap and bonding wire between your skin, the ESD
mat, and the hardware is known as bonding. Use only Field Service kits with a wrist strap, mat, and bonding wire. Never
use wireless wrist straps. Always be aware that the internal wires of a wrist strap are prone to damage from normal wear
and tear, and must be checked regularly with a wrist strap tester in order to avoid accidental ESD hardware damage. It is
recommended to test the wrist strap and bonding wire at least once per week.
●ESD Wrist Strap Tester – The wires inside of an ESD strap are prone to damage over time. When using an unmonitored
kit, it is a best practice to regularly test the strap prior to each service call, and at a minimum, test once per week. A
wrist strap tester is the best method for doing this test. If you do not have your own wrist strap tester, check with your
regional office to find out if they have one. To perform the test, plug the wrist-strap's bonding-wire into the tester while it is
strapped to your wrist and push the button to test. A green LED is lit if the test is successful; a red LED is lit and an alarm
sounds if the test fails.
●Insulator Elements – It is critical to keep ESD sensitive devices, such as plastic heat sink casings, away from internal parts
that are insulators and often highly charged.
●Working Environment – Before deploying the ESD Field Service kit, assess the situation at the customer location. For
example, deploying the kit for a server environment is different than for a desktop or portable environment. Servers are
typically installed in a rack within a data center; desktops or portables are typically placed on office desks or cubicles. Always
look for a large open flat work area that is free of clutter and large enough to deploy the ESD kit with additional space to
accommodate the type of system that is being repaired. The workspace should also be free of insulators that can cause an
ESD event. On the work area, insulators such as Styrofoam and other plastics should always be moved at least 12 inches or
30 centimeters away from sensitive parts before physically handling any hardware components.
●ESD Packaging – All ESD-sensitive devices must be shipped and received in static-safe packaging. Metal, static-shielded
bags are preferred. However, you should always return the damaged part using the same ESD bag and packaging that the
new part arrived in. The ESD bag should be folded over and taped shut and all the same foam packing material should be
used in the original box that the new part arrived in. ESD-sensitive devices should be removed from packaging only at an
ESD-protected work surface, and parts should never be placed on top of the ESD bag because only the inside of the bag is
shielded. Always place parts in your hand, on the ESD mat, in the system, or inside an anti-static bag.
●Transporting Sensitive Components – When transporting ESD sensitive components such as replacement parts or parts
to be returned to Dell, it is critical to place these parts in anti-static bags for safe transport.
ESD protection summary
It is recommended that all field service technicians use the traditional wired ESD grounding wrist strap and protective anti-static
mat at all times when servicing Dell products. In addition, it is critical that technicians keep sensitive parts separate from all
insulator parts while performing service and that they use anti-static bags for transporting sensitive components.
After working inside your computer
About this task
CAUTION: Leaving stray or loose screws inside your computer may severely damage your computer.
Working inside your computer 9
Steps
1. Replace all screws and ensure that no stray screws remain inside your computer.
2. Connect any external devices, peripherals, or cables you removed before working on your computer.
3. Replace any media cards, discs, or any other parts that you removed before working on your computer.
4. Connect your computer and all attached devices to their electrical outlets.
5. Turn on your computer.
10 Working inside your computer
2
Major components of your computer 11
Major components of your computer
12 Major components of your computer
1. Base cover
2. Battery
3. Speakers
4. Memory module
5. Assembly inner frame
6. System board
7. Keyboard assembly
8. Palm-rest assembly
9. Display assembly
10. Battery LED board
11. Coin-cell battery
12. Power button/fingerprint board
13. Heat sink
14. Solid-state drive
15. WWAN card
16. WLAN card
Major components of your computer 13
Removing and installing components
NOTE: The images in this document may differ from your computer depending on the configuration you ordered.
Topics:
•Recommended tools
•Screw list
•Disassembly and reassembly
Recommended tools
The procedures in this document may require the following tools:
●Phillips screwdriver #0
●Plastic scribe
Screw list
NOTE: When removing screws from a component, it is recommended to note the screw type, the quantity of screws, and
then place them in a screw storage box. This is to ensure that the correct number of screws and correct screw type is
restored when the component is replaced.
NOTE: Some systems have magnetic surfaces. Ensure that the screws are not left attached to such surface when
replacing a component.
NOTE: Screw color may vary with the configuration ordered.
Table 1. Latitude 5420 screw list
Component Screw type Quantity Screw image
Base cover Captive screws 8 N/A
WLAN card Captive screws 1 N/A
WWAN card M2x2.5 1
M.2 2230 solid-state drive M2x3 4
M.2 2280 solid-state drive M2x3 2
Assembly inner frame M2x3
M2x5
7
3
3-cell battery M2x5 2
3
14 Removing and installing components
Table 1. Latitude 5420 screw list (continued)
Component Screw type Quantity Screw image
4-cell battery M2x5 3
Heat sink—integrated Captive screws 4 N/A
System Fan M2x5 2
eDP cable/bracket M2x3 2
USB Tyoe-C support bracket M2x5 3
System board M2x3 4
Power button M2x2.5 2
Smart card reader M2x2.5 3
Battery LED board M2x3 1
Keyboard assembly M2x2 6
Keyboard bracket M2x2 17
Display assembly M2.5x5 (display hinge to
palm-rest assembly)
4
Display hinge M2.5x3 (display hinge to
display back cover)
4
Display panel M2.5x3 2
Disassembly and reassembly
NOTE: The images in this document may differ from your computer depending on the configuration you ordered.
Subscriber Identity Module (SIM) card
Removing the SIM card
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
NOTE: SIM card or SIM card tray removal is only available on systems that are shipped with WWAN module. The procedure
for removal is only applicable for systems that are shipped with a WWAN module.
Removing and installing components 15
CAUTION: Removing the SIM card with the computer turned on, may cause data loss or damage to the card.
Ensure that your computer is turned off or the network connections are disabled.
About this task
The following images indicate the location of the SIM card and provide a visual representation of the removal procedure.
Steps
1. Insert a pin into the hole of the SIM card tray and push inward until the tray is released
2. Slide the SIM card tray out of the slot on the computer.
3. Remove the SIM card from the SIM card tray.
4. Slide the SIM card tray into the slot, until it clicks into place.
Installing the SIM card
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
NOTE: SIM card or SIM card tray removal is only available on systems that are shipped with WWAN module. Hence,
removing procedure is only applicable for systems that are shipped with WWAN module.
About this task
The following image indicates the location of the SIM card and provides a visual representation of the installation procedure.
16 Removing and installing components
Steps
1. Insert a pin into the hole of the SIM card tray and push inward until the tray is released
2. Slide the SIM card tray out of the slot on the computer.
3. Place the SIM card into the SIM card tray with the metallic contact facing up.
4. Align the SIM card tray with the slot on the computer and carefully slide it in.
5. Slide the SIM card tray into the slot, until it clicks into place.
Next steps
1. Follow the procedure in After working inside your computer.
Micro Secure Digital (SD) Card
Removing the microSD card
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
About this task
The following images indicate the location of the microSD card and provide a visual representation of the removal procedure.
Removing and installing components 17
Steps
1. Push the microSD card to release it from the computer.
2. Slide the microSD card out of the computer.
Installing the microSD card
About this task
The following image indicates the location of the microSD card and provides a visual representation of the installation procedure.
Steps
1. Align the microSD card to its slot on the computer.
2. Slide the microSD card into the slot until it clicks into place.
18 Removing and installing components
Next steps
Follow the procedures in After working inside your computer.
Base cover
Removing the base cover
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD card.
About this task
The following images indicate the location of the base cover and provide a visual representation of the removal procedure.
Removing and installing components 19
Steps
1. Loosen the eight captive screws that secure the base cover to the palm-rest assembly and keyboard assembly.
2. Using a plastic scribe, pry the base cover from the U-shaped indents at the top edge of the base cover to remove the base
cover from the palm-rest assembly and keyboard assembly.
3. Grasp the left side and the right side of the base cover and remove the base cover from the palm-rest assembly and
keyboard assembly.
Installing the base cover
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following images indicate the location of the base cover and provide a visual representation of the installation procedure.
20 Removing and installing components
Removing and installing components 21
Steps
1. Align the screw holes on the base cover with the screw holes on the palm-rest assembly and keyboard assembly, and then
snap the base cover into place.
2. Tighten the eight captive screws that secure the base cover to the palm-rest assembly and keyboard assembly.
Next steps
1. Install the microSD card.
2. Install the SIM card.
3. Follow the procedure in After working inside your computer.
WLAN card
Removing the WLAN card
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD card.
5. Remove the base cover.
About this task
The following images indicate the location of the WLAN card and provide a visual representation of the removal procedure.
22 Removing and installing components
Steps
NOTE: When removing the WLAN card from the system, if the adhesive pad which helps secure the WLAN card in place is
removed from the system along with the WLAN card, adhere it back to the system.
1. Remove the screw (M2x2.5) that secures the WLAN card bracket to the WLAN card.
2. Slide and remove the WLAN card bracket off the WLAN card.
3. Disconnect the antenna cables from the WLAN card.
4. Slide and remove the WLAN card from the WLAN card slot.
Installing the WLAN card
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the WLAN card and provides a visual representation of the installation procedure.
Removing and installing components 23
Steps
1. Connect the antenna cables to the wireless card.
The following table provides the antenna-cable color scheme:
Table 2. Antenna-cable color scheme
Connectors on the wireless card Antenna-cable color
Main (white triangle) White
Auxiliary (black triangle) Black
2. Place the WLAN-card bracket on the WLAN card.
3. Align the notch on the wireless card with the tab on the WLAN card slot.
NOTE: When removing the WLAN card from the computer, if the adhesive pad which helps secure the WLAN card in
place is removed from the computer along with the WLAN card, adhere it back to the computer.
4. Slide the wireless card at an angle into the WLAN card slot.
5. Replace the screw (M2x2.5) to secure the WLAN-card bracket to the WLAN card.
Next steps
1. Install the base cover.
2. Install the microSD card.
3. Install the SIM card.
4. Follow the procedure in After working inside your computer.
24 Removing and installing components
WWAN card
Removing the WWAN card
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD card.
5. Remove the base cover.
About this task
The following image indicates the location of the WWAN card and provide a visual representation of the removal procedure.
Steps
1. Remove the screw (M2x2.5) that secures the WWAN card bracket to the WWAN card.
2. Slide and remove the WWAN card bracket off the WWAN card.
3. Disconnect the antenna cables from the WWAN card.
4. Slide and remove the WWAN card from the WWAN card slot.
Removing and installing components 25
Installing the WWAN card
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the WWAN card and provides a visual representation of the installation procedure.
Steps
1. Connect the antenna cables to the WWAN card.
The following table provides the antenna-cable color scheme:
Table 3. Antenna-cable color scheme
Connectors on the WWAN card Antenna-cable color
Main (white triangle) White
Auxiliary (black triangle) Black
2. Place the WWAN card bracket on the WWAN card.
3. Align the notch on the WWAN card with the tab on the WWAN slot.
4. Slide the WWAN card at an angle into the WWAN slot.
5. Replace the screw (M2x2.5) to secure the WWAN bracket to the WWAN card.
26 Removing and installing components
NOTE: For instructions on how to find your computer's IMEI (International Mobile Station Equipment Identity) number,
see the knowledge base article 000143678 at www.dell.com/support.
Next steps
1. Install the base cover.
2. Install the microSD card.
3. Install the SIM card.
4. Follow the procedure in After working inside your computer.
Solid-state drive
Removing the M.2 2280 solid-state drive
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD card.
5. Remove the base cover.
About this task
The following images indicate the location of the M.2 2280 solid-state drive and provide a visual representation of the removal
procedure.
Steps
1. Remove the two screws (M2x3) that secures the M.2 2280 solid-state drive thermal plate to the system board.
2. Lift the M.2 2280 solid-state drive thermal plate off the system board.
3. Slide and remove the M.2 2280 solid-state drive from the solid-state drive slot on the system board.
Removing and installing components 27
Installing the M.2 2280 solid-state drive
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the M.2 2280 solid-state drive and provides a visual representation of the
installation procedure.
Steps
1. Align the notch on the M.2 2280 solid-state drive with the tab on the solid-state drive slot.
2. Slide the M.2 2280 solid-state drive into the solid-state drive slot on the system board.
3. Align the screw holes on the M.2 2280 solid-state drive thermal plate with the screw holes on the system board.
4. Replace the two screws (M2x3) that secures the M.2 2280 solid-state drive thermal plate to the system board.
Next steps
1. Install the base cover.
2. Install the microSD card.
3. Install the SIM card.
4. Follow the procedure in After working inside your computer.
Removing the M.2 2230 solid-state drive
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD card.
5. Remove the base cover.
28 Removing and installing components
About this task
The following images indicate the location of the M.2 2230 solid-state drive and provide a visual representation of the removal
procedure.
Steps
1. Remove the two screws (M2x3) that secures the M.2 2230 solid-state drive thermal plate to the M.2 2230 solid-state drive
holder.
2. Remove the single screw (M2x3) that secure the M.2 2230 solid-state drive holder to the system board.
3. Lift the M.2 2230 solid-state drive holder off the system board.
4. Flip the M.2 2230 solid-state drive holder and remove the single screw (M2x3) that secure the M.2 2230 solid-state drive to
the M.2 2230 solid-state drive holder.
5. Slide and remove the M.2 2230 solid-state drive from the M.2 2230 solid-state drive holder.
Installing the M.2 2230 solid-state drive
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the M.2 2230 solid-state drive and provides a visual representation of the
installation procedure.
Removing and installing components 29
Steps
1. Flip the M.2 2230 solid-state drive holder and align the notch on the M.2 2230 solid-state drive with the tab on the M.2
2230 solid-state drive holder.
2. Replace the single screw (M2x3) that secure the M.2 2230 solid-state drive to the M.2 2230 solid-state drive holder.
3. Align and insert the M.2 2230 solid-state drive holder on the system board to accommodate the M.2 2230 solid-state drive.
4. Replace the single screw (M2x3) that secure the M.2 2230 solid-state drive holder to the system board.
5. Align the screw holes on the M.2 2230 solid-state drive thermal pad with the screw holes on the M.2 2230 solid-state drive
holder.
6. Replace the two screws (M2x2.5) that secures the M.2 2230 solid-state drive thermal pad to the M.2 2230 solid-state drive
holder.
Next steps
1. Install the base cover.
2. Install the microSD card.
3. Install the SIM card.
4. Follow the procedure in After working inside your computer.
30 Removing and installing components
Memory modules
Removing the memory modules
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD card.
5. Remove the base cover.
About this task
The following images indicate the location of the memory modules and provide a visual representation of the removal procedure.
Steps
1. Using your fingertips, spread apart the securing clips on the memory-module slot until the memory module pops up.
2. Slide and remove the memory module from the memory-module slot.
NOTE: Repeat step 1 and 2 if there are two memory modules.
Installing the memory modules
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the memory modules and provides a visual representation of the installation
procedure.
Removing and installing components 31
Steps
1. Align the notch on the memory module with the tab on the memory-module slot.
2. Slide the memory module firmly into the slot at an angle and press the memory module down until it clicks into place.
NOTE: If you do not hear the click, remove the memory module and reinstall it.
Next steps
1. Install the base cover.
2. Install the microSD card.
3. Install the SIM card.
4. Follow the procedure in After working inside your computer.
Battery
Lithium-ion battery precautions
CAUTION:
●Exercise caution when handling Lithium-ion batteries.
●Discharge the battery completely before removing it. Disconnect the AC power adapter from the system and
operate the computer solely on battery power—the battery is fully discharged when the computer no longer
turns on when the power button is pressed.
●Do not crush, drop, mutilate, or penetrate the battery with foreign objects.
●Do not expose the battery to high temperatures, or disassemble battery packs and cells.
●Do not apply pressure to the surface of the battery.
●Do not bend the battery.
●Do not use tools of any kind to pry on or against the battery.
●Ensure any screws during the servicing of this product are not lost or misplaced, to prevent accidental
puncture or damage to the battery and other system components.
32 Removing and installing components
●If the battery gets stuck inside your computer as a result of swelling, do not try to release it as puncturing,
bending, or crushing a lithium-ion battery can be dangerous. In such an instance, contact Dell technical
support for assistance. See www.dell.com/contactdell.
●Always purchase genuine batteries from www.dell.com or authorized Dell partners and resellers.
●Swollen batteries should not be used and should be replaced and disposed properly. For guidelines on how to
handle and replace swollen Lithium-ion batteries, see Handling swollen Lithium-ion batteries.
Removing the 3-cell battery
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD card.
5. Remove the base cover.
NOTE: If battery is disconnected from system board for service, then there is a delay during system boot-up as the system
undergoes RTC battery reset.
About this task
The following images indicate the location of the 3-cell battery and provide a visual representation of the removal procedure.
Steps
1. Disconnect the battery cable from the system board, if it was not disconnected earlier.
2. Remove the two screws (M2x5) that secure the battery to the palm-rest assembly and keyboard assembly.
3. Lift the battery off the palm-rest assembly and keyboard assembly.
Removing and installing components 33
Installing the 3-cell battery
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the 3-cell battery and provides a visual representation of the installation procedure.
NOTE: If battery is disconnected from system board for service, then there is a delay during system boot-up as the system
undergoes RTC battery reset.
Steps
1. Align and place the battery from the left side on the computer.
2. Replace the two screws (M2x5) that secure the battery to the palm-rest assembly and keyboard assembly.
3. Connect the battery cable to the system board.
Next steps
1. Install the base cover.
2. Install the microSD card.
3. Install the SIM card.
4. Follow the procedure in After working inside your computer.
Removing the 4-cell battery
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD card.
5. Remove the base cover.
34 Removing and installing components
NOTE: If battery is disconnected from system board for service, then there is a delay during system boot-up as the system
undergoes RTC battery reset.
About this task
The following images indicate the location of the battery and provide a visual representation of the removal procedure.
Steps
1. Disconnect the battery cable from the system board, if it was not disconnected earlier.
2. Remove the three screws (M2x5) that secure the battery to the palm-rest assembly and keyboard assembly.
3. Lift the battery off the palm-rest assembly and keyboard assembly.
Installing the 4-cell battery
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the 4-cell battery and provides a visual representation of the installation procedure.
NOTE: If battery is disconnected from system board for service, then there is a delay during system boot-up as the system
undergoes RTC battery reset.
Removing and installing components 35
Steps
1. Align and place the battery from the left side on the computer.
2. Replace the three screws (M2x5) that secure the battery to the palm-rest assembly and keyboard assembly.
3. Connect the battery cable to the system board.
Next steps
1. Install the base cover.
2. Install the microSD card.
3. Install the SIM card.
4. Follow the procedure in After working inside your computer.
Battery cable
Removing the battery cable
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD card.
5. Remove the base cover.
6. Remove the battery.
NOTE: If battery is disconnected from system board for service, then there is a delay during system boot-up as the system
undergoes RTC battery reset.
About this task
The following images indicate the location of the battery cable and provide a visual representation of the removal procedure.
36 Removing and installing components
Steps
1. Flip the battery and unroute the battery cable from the routing guides on the battery.
2. Disconnect the battery cable from the connector on the battery.
3. Lift the battery cable away from the battery.
Installing the battery cable
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the battery cable and provides a visual representation of the installation procedure.
Removing and installing components 37
Steps
1. Align and place the battery cable on the battery.
2. Route the battery cable through the routing guides on the battery.
3. Connect the battery cable to the connector on the battery.
Next steps
1. Install the battery.
2. Install the base cover.
3. Install the microSD card.
4. Install the SIM card.
5. Follow the procedure in After working inside your computer.
Assembly inner frame
Removing the assembly inner frame
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD card.
5. Remove the solid-state drive.
6. Remove the base cover.
7. Remove the battery.
8. Remove the WLAN card.
9. Remove the WWAN card.
About this task
The following image indicates the location of the assembly inner frame and provides a visual representation of the removal
procedure.
38 Removing and installing components
Steps
1. Unroute the antenna cables from the routing guides on the assembly inner frame.
2. Disconnect the LED-board cable from the connector on the system board.
3. Disconnect the speaker cable from the connector on the system board and unroute the cable from the routing guides on the
assembly inner frame.
4. Remove the three screws (M2x5) that secures the assembly inner frame to the system board and the palm-rest assembly.
5. Remove the seven screws (M2x3) that secure the assembly inner frame to the system board and the palm-rest assembly .
6. Lift the assembly inner frame off the system board and the palm-rest assembly.
Removing and installing components 39
Installing the assembly inner frame
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the assembly inner frame and provides a visual representation of the installation
procedure.
40 Removing and installing components
Steps
1. Align the screw holes on the assembly inner frame with the screw holes on the system board and the palm-rest assembly.
NOTE: Ensure that the tab on the top-left corner of the assembly inner frame is installed underneath the tab on the
palm-rest assembly.
2. Replace the seven screws (M2x3) that secure the assembly inner frame to the system board and the palm-rest assembly.
3. Replace the three screws (M2x5) that secure the assembly inner frame to the system board and the palm-rest assembly.
4. Connect the LED-board cable to the connector on the system board.
5. Route the speaker cable firmly through the routing guide on the assembly inner frame and connect the speaker cable to the
connector on the system board.
6. Route the antennas cable through the routing guides on the assembly inner frame.
Next steps
1. Install the WWAN card.
2. Install the WLAN card.
3. Install the battery.
4. Install the solid-state drive.
5. Install the base cover.
6. Install the microSD card.
7. Install the SIM card.
8. Follow the procedure in After working inside your computer.
LED board
Removing the LED board
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Remove the SIM card.
3. Remove the microSD card.
4. Remove the base cover.
5. Remove the battery.
About this task
The following image indicates the location of the LED board and provides a visual representation of the removal procedure.
Removing and installing components 41
Steps
1. Disconnect the LED-board cable from the connector on the system board.
2. Remove the single screw (M2x3) that secures the LED board to the palm-rest assembly.
3. Lift the LED board and cable away from the palm-rest assembly.
Installing the LED board
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the LED board and provides a visual representation of the installation procedure.
42 Removing and installing components
Steps
1. Align the screw hole on the LED board with the screw hole on the palm-rest assembly.
2. Replace the single screw (M2x3) to secure the LED board to the palm-rest assembly.
3. Route the LED-board cable and connect the cable to the connector on the system board.
Next steps
1. Install the battery.
2. Install the base cover.
3. Install the microSD card.
4. Install the SIM card.
5. Follow the procedure in After working inside your computer.
Heat sink
Removing the heat sink
Prerequisites
1. Follow the procedure in before working inside your computer.
CAUTION: The heat sink may become hot during normal operation. Allow sufficient time for the heat sink to
cool before you touch it.
2. Remove the SIM card.
3. Remove the microSD card.
4. Remove the base cover.
5. Remove the battery.
About this task
The following image indicates the location of the heat sink and provides a visual representation of the removal procedure.
Removing and installing components 43
Steps
1. Disconnect the system fan cable from the connector on the system board.
2. Remove the two screws (M2x5) that secures the heat sink to the system board.
3. Loosen the four captive screws that secure the heat sink to the system board.
4. Lift the heat sink off the system board.
Installing the heat sink
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the heat sink and provides a visual representation of the installation procedure.
44 Removing and installing components
Steps
1. Align the screw holes on the heat sink with the screw holes on the system board.
2. Connect the system fan cable to the connector on the system board.
3. Tighten the four captive screws that secure the heat sink to the system board.
4. Replace the two screws (M2x5) that secures the heat sink to the system board.
Next steps
1. Install the battery.
2. Install the base cover.
3. Install the microSD card.
4. Install the SIM card.
5. Follow the procedure in After working inside your computer.
Speakers
Removing the speaker
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Remove the SIM card.
3. Remove the microSD card.
4. Remove the base cover.
5. Remove the battery.
About this task
The following images indicate the location of the speaker and provide a visual representation of the removal procedure.
Removing and installing components 45
Steps
1. Disconnect the speaker cable from the connector on the system board.
2. Unroute the speaker cable from the routing guides on the assembly inner frame and palm-rest assembly.
3. Lift the speakers along with the cable off the palm-rest assembly.
Installing the speaker
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the speaker and provides a visual representation of the installation procedure.
46 Removing and installing components
Steps
1. Using the alignment posts and rubber grommets, place the speakers in the slots on the palm-rest assembly.
2. Route the speaker cable through the routing guide on the assembly inner frame and palm-rest assembly.
3. Connect the speaker cable to the connector on the system board.
Next steps
1. Install the battery.
2. Install the base cover.
3. Install the microSD card.
4. Install the SIM card.
5. Follow the procedure in After working inside your computer.
System board
Removing the system board
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD card.
5. Remove the base cover.
6. Remove the WLAN card.
7. Remove the WWAN card.
8. Remove the memory module.
9. Remove the heat sink.
10. Remove the solid-state drive.
11. Remove the battery.
12. Remove the assembly inner frame.
About this task
The following images indicate the location of the system board and provide a visual representation of the removal procedure.
Removing and installing components 47
Steps
NOTE: The system board can be removed and installed with the heat sink attached in order to simplify the procedure and
preserve the heat sink between the system board and heat-sink. In order to do so, technicians must also remove the two
(M2x5) screws the secure the system fan to the system board.
NOTE: For the models shipped with a fingerprint reader, disconnect the fingerprint reader cable from the connector on the
system board before removing the system board from the palm-rest assembly and keyboard assembly.
1. Remove the two screws (M2x3) that secure the eDP/display cable bracket to the system board.
2. Lift the eDP/display cable bracket away from the system.
3. Peel the tape that secures the display cable to the system board.
48 Removing and installing components
4. Using the pull tab, disconnect the display cable from the connector on the system board.
5. Disconnect the coin-cell battery cable from the connecter on the system board.
NOTE: When you disconnect the coin-cell battery cable from the connecter on the system board, the CMOS setting is
cleared.
6. Open the latch and disconnect the USH board cable from the connector on the system board.
7. Open the latch and disconnect the touch-pad cable from the connector on the system board.
8. Remove the three screws (M2x5) that secure the USB Type-C bracket to the system board.
9. Lift off the USB Type-C bracket off the system board.
10. Remove the four screws (M2x5) that secure the system board to the palm-rest assembly and keyboard assembly.
11. Lift the system board off the palm-rest assembly and keyboard assembly.
Installing the system board
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the system board and provides a visual representation of the installation procedure.
Removing and installing components 49
Steps
NOTE: The system board can be removed and installed with the thermal module attached in order to simplify the procedure
and preserve the thermal bond between the system board and heat-sink. In order to do so, technicians must also remove
the two (M2x5) screws the secure the system fan to the system board.
1. Slide the system board to make the USB Type-C connector to toe-in to the hinge saddle and align the screw holes on the
system board with the screw holes on the palm-rest assembly and keyboard assembly.
2. Replace the four screws (M2x3) to secure the system board to the palm-rest assembly and keyboard assembly.
3. Align and place the USB Type-C bracket on the system board.
4. Replace the three screws (M2x5) that secure the USB Type-C bracket to the system board.
5. Connect the USH board cable to the system board and close the latch to secure the cable to the system board.
6. Connect the touch pad cable to the system board and close the latch to secure the cable to the system board.
7. Route the coin-cell battery cable under the system board and connect the coin-cell battery cable to the connector on the
system board.
8. Route the display and eDP/display cable through the routing guide on the system board.
9. Connect the eDP/display cable to the connector on the system board.
10. Connect the display cable to the connector on the system board.
11. Adhere the tape that secures the display cable to the system board.
12. Align the screw holes on the eDP/display cable bracket with the screw holes on the system board.
13. Replace the two screws (M2x3) that secure the eDP/display cable bracket to the system board.
Next steps
1. Install the assembly inner frame.
2. Install the battery.
3. Install the solid-state drive.
4. Install the heat sink.
5. Install the memory module.
6. Install the WWAN card.
7. Install the WLAN card.
8. Install the base cover.
9. Install the microSD card.
10. Install the SIM card.
11. Follow the procedure in After working inside your computer.
50 Removing and installing components
Power-button board
Removing the power-button board
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Remove the SIM card.
3. Remove the microSD card.
4. Remove the base cover.
5. Remove the WLAN card.
6. Remove the WWAN card.
7. Remove the memory module.
8. Remove the solid-state drive.
9. Remove the battery.
10. Remove the assembly inner frame.
11. Remove the system board.
About this task
The following images indicate the location of the power-button board and provide a visual representation of the removal
procedure.
Steps
1. Remove the two screws (M2x2.5) that secure the power-button board to the palm-rest assembly.
2. Lift the power-button board off the palm-rest assembly.
Removing and installing components 51
Installing the power-button board
About this task
The following images indicate the location of the power-button board and provide a visual representation of the installation
procedure.
Steps
1. Align and place the power-button board on the palm-rest assembly.
2. Replace the two screws (M2x2.5) that secure the power-button board to the palm-rest assembly.
Next steps
1. Install the system board.
2. Install the assembly inner frame.
3. Install the battery.
4. Install the solid-state drive.
5. Install the memory module.
6. Install the WWAN card.
7. Install the WLAN card.
8. Install the base cover.
9. Install the microSD card.
10. Install the SIM card.
11. Follow the procedure in After working inside your computer.
52 Removing and installing components
Smart card reader
Removing the smart card reader
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Remove the SIM card.
3. Remove the microSD card.
4. Remove the base cover.
5. Remove the WLAN card.
6. Remove the WWAN card.
7. Remove the solid-state drive.
8. Remove the battery.
9. Remove the assembly inner frame.
About this task
The following images indicate the location of the smart card reader and provide a visual representation of the removal
procedure.
Removing and installing components 53
Steps
1. Open the latch and disconnect the smart card reader cable from the connector on the USH board.
2. Remove the four screws (M2x2.5) that secure the smart card reader to the palm-rest assembly.
3. Lift the smart card reader off the palm-rest assembly.
Installing the smart card reader
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the smart card reader and provides a visual representation of the installation
procedure.
Steps
1. Align and place the smart card reader on the palm-rest assembly.
2. Replace the four screws (M2x2.5) that secure the smart card reader to the palm-rest assembly.
3. Connect the smart card reader cable to the connector on the USH board.
54 Removing and installing components
Next steps
1. Install the assembly inner frame.
2. Install the battery.
3. Install the solid-state drive.
4. Install the WWAN card.
5. Install the WLAN card.
6. Install the base cover.
7. Install the microSD card.
8. Install the SIM card.
9. Follow the procedure in After working inside your computer.
Keyboard assembly
Removing the keyboard assembly
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Remove the SIM card.
3. Remove the microSD card.
4. Remove the base cover.
5. Remove the WLAN card.
6. Remove the WWAN card.
7. Remove the memory module.
8. Remove the solid-state drive.
9. Remove the battery.
10. Remove the assembly inner frame.
11. Remove the system board.
About this task
The following images indicate the location of the keyboard assembly and provide a visual representation of the removal
procedure.
Removing and installing components 55
Steps
1. Open the latch and disconnect the keyboard cable from the connector on the touch pad.
2. Remove the 17 screws (M2x2) that secure the keyboard assembly to the palm-rest assembly.
3. Remove the keyboard assembly off the palm-rest assembly.
Installing the keyboard assembly
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the keyboard assembly and provides a visual representation of the installation
procedure.
56 Removing and installing components
Steps
1. Align and place the keyboard assembly on the palm-rest assembly.
2. Replace the 17 screws (M2x2) that secure the keyboard assembly to the palm-rest assembly.
3. Connect the keyboard cable to the connector on the touch-pad.
Next steps
1. Install the system board.
2. Install the assembly inner frame.
3. Install the battery.
4. Install the solid-state drive.
5. Install the memory module.
6. Install the WWAN card.
7. Install the WLAN card.
8. Install the base cover.
9. Install the microSD card.
10. Install the SIM card.
11. Follow the procedure in After working inside your computer.
Keyboard bracket
Removing the keyboard bracket
Prerequisites
1. Follow the procedure in Before working inside your computer.
Removing and installing components 57
2. Remove the SIM card.
3. Remove the microSD card.
4. Remove the base cover.
5. Remove the WLAN card.
6. Remove the WWAN card.
7. Remove the memory module.
8. Remove the solid-state drive.
9. Remove the battery.
10. Remove the assembly inner frame.
11. Remove the system board.
12. Remove the keyboard assembly.
About this task
The following images indicate the location of the keyboard bracket and provide a visual representation of the removal procedure.
Steps
1. Remove the six screws (M2x2) that secure the keyboard to the keyboard bracket.
2. Remove the keyboard from the keyboard bracket.
Installing the keyboard bracket
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the keyboard bracket and provides a visual representation of the installation
procedure.
58 Removing and installing components
Steps
1. Align and place the keyboard on the keyboard bracket.
2. Replace the six screws (M2x2) to secure the keyboard to the keyboard bracket.
Next steps
1. Install the keyboard assembly.
2. Install the system board.
3. Install the assembly inner frame.
4. Install the battery.
5. Install the solid-state drive.
6. Install the memory module.
7. Install the WWAN card.
8. Install the WLAN card.
9. Install the base cover.
10. Install the microSD card.
11. Install the SIM card.
12. Follow the procedure in After working inside your computer.
Display assembly
Removing the display assembly
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD card.
5. Remove the base cover.
6. Remove the WLAN card.
7. Remove the WWAN card.
Removing and installing components 59
About this task
The following images indicate the location of the display assembly and provide a visual representation of the removal procedure.
60 Removing and installing components
Steps
1. Remove the two screws (M2x3) that secure the eDP cable bracket to the system board.
2. Lift the eDP cable bracket away from the system.
3. Peel the tape that secures the display cable to the system board.
4. Using the pull tab, disconnect the display cable from the connector on the system board.
5. Disconnect the eDP cable from the connector on the system board and unroute it from the routing guide.
6. Peel the adhesive tape partially and unroute the antenna cables from the routing guides on the system board.
7. Open the display assembly to a 180 degree and flip over the computer, and then place the computer on a flat surface.
8. Remove the four screws (M2.5x3) that secure the display hinges to the system board.
9. Remove the display assembly off the computer.
Installing the display assembly
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the display assembly and provides a visual representation of the installation
procedure.
Removing and installing components 61
62 Removing and installing components
Steps
1. Place the display assembly on the system. Align the screw holes on the display hinges with screw holes on the palm-rest
assembly.
2. Replace the four screws (M2.5x3) that secure the display hinges to the palm-rest assembly.
3. Close the display.
4. Route the antenna cables through the routing guide and adhere the tape to secure the cables to the system board.
5. Route the display and eDP cable through the routing guide on the system board.
6. Connect the eDP cable to the connector on the system board.
7. Connect the display cable to the connector on the system board.
8. Adhere the tape that secures the display cable to the system board.
9. Align the screw holes on the eDP cable bracket with the screw holes on the system board.
10. Replace the two screws (M2x3) that secure the eDP cable bracket to the system board.
Next steps
1. Install the WWAN card.
2. Install the WLAN card.
3. Install the base cover.
4. Install the microSD card.
5. Install the SIM card.
6. Follow the procedure in After working inside your computer.
Display bezel
Removing the display bezel
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD card.
5. Remove the base cover.
6. Remove the WLAN card.
7. Remove the WWAN card.
8. Remove the display assembly.
Removing and installing components 63
About this task
The following images indicate the location of the display bezel and provide a visual representation of the removal procedure.
Steps
NOTE: The display bezel is adhered to the display panel with adhesive. Insert a plastic scribe into the recesses near both
hinge caps to start the prying process to release the display bezel. Pry along the outside edge of the display bezel and work
your way around the entire display bezel until the display bezel is separated from the display cover.
CAUTION: Carefully pry and remove the display bezel to minimize the risk of display panel damages.
1. Insert a plastic scribe into the recesses near both hinge caps to start the prying process to release the display bezel.
2. Pry along the outside edge of the display bezel and work your way around the entire display bezel until the display bezel is
separated from the display cover.
3. Lift the display bezel from the display assembly.
Installing the display bezel
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the display bezel and provides a visual representation of the installation procedure.
64 Removing and installing components
Steps
1. Align and place the display bezel on the display assembly.
2. Gently snap the display bezel into place.
Next steps
1. Install the display assembly.
2. Install the WWAN card.
3. Install the WLAN card.
4. Install the base cover.
5. Install the microSD card.
6. Install the SIM card.
7. Follow the procedure in After working inside your computer.
Display panel
Removing the display panel
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD card.
5. Remove the WLAN card.
6. Remove the WWAN card.
7. Remove the base cover.
8. Remove the display assembly.
9. Remove the display bezel.
Removing and installing components 65
About this task
The following images indicate the location of the display panel and provide a visual representation of the removal procedure.
66 Removing and installing components
Removing and installing components 67
Steps
NOTE: The display panel is preassembled with the display brackets as a single service part. Do not pull the Stretch Release
(SR) tapes and separate the brackets from the display panel.
1. Remove the two screws (M2.5x3) that secure the display panel to the display back cover.
NOTE: While removing the display panel, disengage the display panel tabs from the display cover before flipping it over
2. Lift and open the display panel to access the display cable.
3. Peel the conductive tape on the display cable connector.
4. Open the latch and disconnect the cable from the connector on the display panel.
5. Lift the display panel away from the display back cover.
Installing the display panel
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following images indicate the location of the display panel and provides a visual representation of the installation procedure.
68 Removing and installing components
Removing and installing components 69
70 Removing and installing components
Steps
1. Connect the display cable to the connector on the display panel and close the latch.
2. Adhere the conductive tape to secure the display cable to the display panel.
3. Close the display panel and the display back cover to assemble.
NOTE: Ensure that the display panel tabs are inserted into the slots on the display cover.
4. Replace the two screws (M2.5x3) to secure the display panel to the display back cover.
Next steps
1. Install the display bezel.
2. Install the display assembly.
3. Install the WWAN card.
4. Install the WLAN card.
5. Install the base cover.
6. Install the microSD card.
7. Install the SIM card.
8. Follow the procedure in After working inside your computer.
Removing and installing components 71
Camera/microphone module
Removing the camera/microphone module
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD card.
5. Remove the WLAN card.
6. Remove the WWAN card.
7. Remove the base cover.
8. Remove the display assembly.
9. Remove the display bezel.
10. Remove the display panel.
About this task
The following images indicate the location of the camera/microphone module and provide a visual representation of the removal
procedure.
Steps
NOTE: For models shipped with a camera/microphone, there is a recess near the camera/microphone module, indicated
by an arrow etched on the grounding foil, that should be used to begin the prying process. Starting from the recess at the
bottom edge of the camera/microphone module, pry up the camera/microphone module ensuring that the two tiny pegs
used to secure the camera/microphone module in place is not damaged throughout the prying process.
1. Peel the two conductive tapes that secure the camera/microphone module in place.
2. Disconnect the camera/microphone cable from the connector on the camera/microphone module.
3. Carefully lift the camera/microphone module from the display back cover.
Installing the camera/microphone module
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
72 Removing and installing components
About this task
The following image indicates the location of the camera/microphone module and provides a visual representation of the
installation procedure.
Steps
1. Align and place the camera/microphone module into the slot on the display back cover.
2. Connect the camera/microphone cable to the connector on the camera/microphone module.
Next steps
1. Install the display panel.
2. Install the display bezel.
3. Install the display assembly.
4. Install the WWAN card.
5. Install the WLAN card.
6. Install the base cover.
7. Install the microSD card.
8. Install the SIM card.
9. Follow the procedure in After working inside your computer.
eDP/display cable
Removing the eDP cable
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD card.
5. Remove the WLAN card.
6. Remove the WWAN card.
7. Remove the base cover.
8. Remove the display assembly.
9. Remove the display bezel.
10. Remove the display panel.
Removing and installing components 73
About this task
The following images indicate the location of the eDP cable and provide a visual representation of the removal procedure.
Steps
1. Disconnect the eDP/display cable from the connector on the camera/microphone module.
2. Peel the conductive tape and unroute the eDP/display cable to release it from adhesive and lift the eDP/display cable from
the display back cover.
Installing the eDP cable
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the eDP cable and provides a visual representation of the installation procedure.
74 Removing and installing components
Steps
1. Connect the eDP/display cable to the connector on the camera.
2. Adhere the eDP/display cable to the display back cover.
3. Adhere the conductive tape and route the eDP/display cable to the display back cover.
Next steps
1. Install the display panel.
2. Install the display bezel.
3. Install the display assembly.
4. Install the WWAN card.
5. Install the WLAN card.
6. Install the base cover.
7. Install the microSD card.
8. Install the SIM card.
9. Follow the procedure in After working inside your computer.
Removing and installing components 75
Sensor board
Removing the sensor board
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD card.
5. Remove the base cover.
6. Remove the WLAN card.
7. Remove the WWAN card.
8. Remove the display assembly.
9. Remove the display bezel.
About this task
The following images indicate the location of the sensor board and provide a visual representation of the removal procedure.
Steps
1. Open the latch and disconnect the display cable from connector on the sensor board.
2. Gently lift the sensor board away from the display back cover.
Installing the sensor board
About this task
The following images indicate the location of the sensor board and provide a visual representation of the removal procedure.
76 Removing and installing components
Steps
1. Align and place the sensor board on the display back cover.
2. Connect the display cable to the connector on the sensor board and close the latch.
Next steps
1. Install the display bezel.
2. Install the display assembly.
3. Install the WWAN card.
4. Install the WLAN card.
5. Install the base cover.
6. Install the microSD card.
7. Install the SIM card.
8. Follow the procedure in After working inside your computer.
Display hinges
Removing the display hinges
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD card.
5. Remove the WLAN card.
6. Remove the WWAN card.
7. Remove the base cover.
8. Remove the display assembly.
9. Remove the display bezel.
10. Remove the display panel.
About this task
The following images indicate the location of the display hinges and provide a visual representation of the removal procedure.
Removing and installing components 77
Steps
1. Remove the two screws (M2.5x3) that secures the right hinge to the display back cover.
2. Lift and remove the right hinge from the display back cover.
3. Remove the two screws (M2.5x3) that secures the left hinge to the display back cover.
4. Lift and remove the left hinge from the display back cover.
Installing the display hinges
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following images indicate the location of the display hinges and provides a visual representation of the installation
procedure.
78 Removing and installing components
Steps
1. Align the screw hole on the left hinge with the screw hole on the display back cover.
2. Replace the two screws (M2.5x3) to secure the left hinge to the display back cover.
3. Align the screw hole on the right hinge with the screw hole on the display back cover.
4. Replace the two screws (M2.5x3) to secure the right hinge to the display back cover.
Next steps
1. Install the display panel.
2. Install the display bezel.
3. Install the display assembly.
4. Install the WWAN card.
5. Install the WLAN card.
6. Install the base cover.
7. Install the microSD card.
8. Install the SIM card.
9. Follow the procedure in After working inside your computer.
Removing and installing components 79
Display back cover
Removing the display back cover
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD card.
5. Remove the base cover.
6. Remove the WLAN card.
7. Remove the WWAN card.
8. Remove the display assembly.
9. Remove the display bezel.
10. Remove the display panel.
11. Remove the camera/microphone module.
12. Remove the eDP/display cable.
13. Remove the sensor board.
14. Remove the display hinges.
About this task
The following images indicate the location of the display back cover and provide a visual representation of the removal
procedure.
Steps
After performing the steps in the pre-requisites, we are left with the display back cover.
Installing the display back cover
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
80 Removing and installing components
About this task
The following images indicate the location of the display back cover and provides a visual representation of the installation
procedure.
Steps
Place the display back cover on a flat surface.
Next steps
1. Install the display hinges.
2. Install the sensor board.
3. Install the eDP/display cable.
4. Install the camera/microphone module.
5. Install the display panel.
6. Install the display bezel.
7. Install the display assembly.
8. Install the WWAN card.
9. Install the WLAN card.
10. Install the base cover.
11. Install the microSD card.
12. Install the SIM card.
13. Follow the procedure in After working inside your computer.
Dummy SIM-card slot filler
Removing the dummy SIM-card slot filler
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Remove the SIM card.
3. Remove the microSD card.
4. Remove the base cover.
5. Remove the WLAN card.
Removing and installing components 81
6. Remove the WWAN card.
7. Remove the memory module.
8. Remove the solid-state drive.
9. Remove the battery.
10. Remove the assembly inner frame.
11. Remove the system board.
12. Remove the smart card reader.
13. Remove the LED board.
14. Remove the power-button board.
15. Remove the keyboard assembly.
16. Remove the display assembly.
17. Remove the palm-rest assembly.
About this task
NOTE: For models shipped with WLAN antennas only, the dummy SIM-card slot filler is a separate service part and is not
included with replacement palm rest. As a result, the dummy SIM-card slot filler must be removed and then reinstalled when
replacing the palm-rest assembly.
The following image indicates the dummy SIM-card slot filler and provides a visual representation of the dummy SIM-card slot
filler removal procedure.
Steps
1. Push the dummy SIM-card slot filler from the top side of the palm-rest assembly.
2. Gently lift the dummy SIM-card slot filler out of the palm-rest assembly.
Installing the dummy SIM-card slot filler
Prerequisites
If you are replacing a component, remove the necessary component before the installation procedure.
82 Removing and installing components
About this task
The following image indicates the location of the dummy SIM-card slot filler and provides a visual representation of the dummy
SIM-card slot filler installation procedure.
Steps
1. Place the dummy SIM-card slot filler into its compartment on the palm rest.
NOTE: Ensure that the dummy SIM-card slot filler is aligned with the ribs on the palm-rest assembly.
2. Press the dummy SIM-card slot filler until it clicks into place and ensure it fits securely into the SIM card slot.
Next steps
1. Install the palm-rest assembly.
2. Install the display assembly.
3. Install the keyboard assembly.
4. Install the power-button board.
5. Install the smart card reader.
6. Install the LED board.
7. Install the system board.
8. Install the assembly inner frame.
9. Install the battery.
10. Install the solid-state drive.
11. Install the memory module.
12. Install the WWAN card.
13. Install the WLAN card.
14. Install the base cover.
15. Install the microSD card.
16. Install the SIM card.
17. Follow the procedure in After working inside your computer.
Removing and installing components 83
Palm-rest assembly
Removing the palm-rest assembly
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Remove the SIM card.
3. Remove the microSD card.
4. Remove the base cover.
5. Remove the WLAN card.
6. Remove the WWAN card.
7. Remove the memory module.
8. Remove the solid-state drive.
9. Remove the battery.
10. Remove the assembly inner frame.
11. Remove the system board.
12. Remove the smart card reader.
13. Remove the LED board.
14. Remove the power-button board.
15. Remove the keyboard assembly.
16. Remove the display assembly.
About this task
The following image indicates the palm-rest assembly and provides a visual representation of the removal procedure.
Steps
After performing the steps in the pre-requisites, we are left with the palm-rest assembly.
84 Removing and installing components
Installing the palm-rest assembly
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the palm-rest assembly and provides a visual representation of the installation procedure.
Steps
NOTE: For non-WWAN LTE configuration, you must remove and transfer the dummy SIM card filler when replacing the
palm-rest assembly.
1. Place the palm-rest assembly on a flat surface.
2. Remove the dummy SIM card filler for the non-WWAN LTE configuration.
Next steps
1. Install the display assembly.
2. Install the keyboard assembly.
3. Install the power-button board.
4. Install the smart card reader.
5. Install the LED board.
6. Install the system board.
7. Install the assembly inner frame.
8. Install the battery.
9. Install the solid-state drive.
10. Install the memory module.
11. Install the WWAN card.
12. Install the WLAN card.
13. Install the base cover.
14. Install the microSD card.
15. Install the SIM card.
16. Follow the procedure in After working inside your computer.
Removing and installing components 85
Software
This chapter details the supported operating systems along with instructions on how to install the drivers.
Topics:
•Operating system
•Downloading the drivers
Operating system
Your Latitude 5420 supports the following operating systems:
●Windows 10 Pro, 64-bit
●Windows 10 Home, 64-bit
●Windows 10 Pro Education, 64-bit
●Windows 10 Enterprise N, 64-bit
●Ubuntu Linux 20.04 LTS, 64-bit
Downloading the drivers
Steps
1. Turn on your computer.
2. Go to www.dell.com/support.
3. Enter the Service Tag of your computer, and then click Submit.
NOTE: If you do not have the Service Tag, use the auto-detect feature or manually browse for your computer model.
4. Click Drivers & downloads.
5. Click the Detect Drivers button.
6. Review and agree to the Terms and Conditions to use SupportAssist, then click Continue.
7. If necessary, your computer starts to download and install SupportAssist.
NOTE: Review on-screen instructions for browser-specific instructions.
8. Click View Drivers for My System.
9. Click Download and Install to download and install all driver updates detected for your computer.
10. Select a location to save the files.
11. If prompted, approve requests from User Account Control to make changes on the system.
12. The application installs all drivers and updates identified.
NOTE: Not all files can be installed automatically. Review the installation summary to identify if manual installation is
necessary.
13. For manual download and installation, click Category.
14. From the drop-down list, select the preferred driver.
15. Click Download to download the driver for your computer.
16. After the download is complete, navigate to the folder where you saved the driver file.
17. Double-click the driver file icon and follow the instructions on the screen to install the driver.
4
86 Software
BIOS setup
CAUTION: Unless you are an expert computer user, do not change the settings in the BIOS Setup program.
Certain changes can make your computer work incorrectly.
NOTE: Depending on the computer and its installed devices, the items listed in this section may or may not be displayed.
NOTE: Before you change BIOS Setup program, it is recommended that you write down the BIOS Setup program screen
information for future reference.
Use the BIOS Setup program for the following purposes:
●Get information about the hardware installed in your computer, such as the amount of RAM and the size of the hard drive.
●Change the system configuration information.
●Set or change a user-selectable option, such as the user password, type of hard drive installed, and enabling or disabling
base devices.
Topics:
•BIOS overview
•Entering BIOS setup program
•Navigation keys
•One time boot menu
•System setup options
•Updating the BIOS
•System and setup password
•Clearing BIOS (System Setup) and System passwords
BIOS overview
The BIOS manages data flow between the computer's operating system and attached devices such as hard disk, video adapter,
keyboard, mouse, and printer.
Entering BIOS setup program
Steps
1. Turn on your computer.
2. Press F2 immediately to enter the BIOS setup program.
NOTE: If you wait too long and the operating system logo appears, continue to wait until you see the desktop. Then,
turn off your computer and try again.
Navigation keys
NOTE: For most of the System Setup options, changes that you make are recorded but do not take effect until you restart
the system.
5
BIOS setup 87
Table 4. Navigation keys
Keys Navigation
Up arrow Moves to the previous field.
Down arrow Moves to the next field.
Enter Selects a value in the selected field (if applicable) or follow
the link in the field.
Spacebar Expands or collapses a drop-down list, if applicable.
Tab Moves to the next focus area.
NOTE: For the standard graphics browser only.
Esc Moves to the previous page until you view the main screen.
Pressing Esc in the main screen displays a message that
prompts you to save any unsaved changes and restarts the
system.
One time boot menu
To enter one time boot menu, turn on your computer, and then press F12 immediately.
NOTE: It is recommended to shutdown the computer if it is on.
The one-time boot menu displays the devices that you can boot from including the diagnostic option. The boot menu options
are:
●Removable Drive (if available)
●STXXXX Drive (if available)
NOTE: XXX denotes the SATA drive number.
●Optical Drive (if available)
●SATA Hard Drive (if available)
●Diagnostics
The boot sequence screen also displays the option to access the System Setup screen.
System setup options
NOTE: Depending on your computer and its installed devices, the items listed in this section may or may not appear.
Table 5. System setup options—System information menu
Overview
Latitude 5420
BIOS Version Displays the BIOS version number.
Service Tag Displays the Service Tag of the computer.
Asset Tag Displays the Asset Tag of the computer.
Manufacture Date Displays the manufacture date of the computer.
Ownership Date Displays the ownership date of the computer.
Express Service Code Displays the express service code of the computer.
Ownership Tag Displays the Ownership Tag of the computer.
Signed Firmware Update Displays whether the Signed Firmware Update is enabled on your computer.
Battery Information
88 BIOS setup
Table 5. System setup options—System information menu (continued)
Overview
Primary Displays that battery is primary.
Battery Level Displays the battery level of the computer.
Battery State Displays the battery state of the computer.
Health Displays the battery health of the computer.
AC Adapter Displays whether the AC adapter is connected or not.
Processor Information
Processor Type Displays the processor type.
Maximum Clock Speed Displays the maximum processor clock speed.
Minimum Clock Speed Displays the minimum processor clock speed.
Current Clock Speed Displays the current processor clock speed.
Core Count Displays the number of cores on the processor.
Processor ID Displays the processor identification code.
Processor L2 Cache Displays the processor L2 Cache size.
Processor L3 Cache Displays the processor L3 Cache size.
Microcode Version Displays the microcode version.
Intel Hyper-Threading Capable Displays whether the processor is Hyper-Threading (HT) capable.
64-Bit Technology Displays whether 64-bit technology is used.
Memory Information
Memory Installed Displays the total computer memory installed.
Memory Available Displays the total computer memory available.
Memory Speed Displays the memory speed.
Memory Channel Mode Displays single or dual channel mode.
Memory Technology Displays the technology used for the memory.
DIMM_SLOT B Displays the DIMM B memory size.
DIMM_SLOT A Displays the DIMM A memory size.
Devices Information
Panel Type Displays the Panel Type of the computer.
Video Controller Displays the video controller type of the computer.
Video Memory Displays the video memory information of the computer.
Wi-Fi Device Displays the wireless device information of the computer.
Native Resolution Displays the native resolution of the computer.
Video BIOS Version Displays the video BIOS version of the computer.
Audio Controller Displays the audio controller information of the computer.
Bluetooth Device Displays the Bluetooth device information of the computer.
LOM MAC Address Displays the LAN On Motherboard (LOM) MAC address of the computer.
Pass Through MAC Address Displays the pass through MAC address of the computer.
Cellular Device Displays the M.2 PCIe SSD information of the computer.
BIOS setup 89
Table 6. System setup options—Boot Configuration menu
Boot Configuration
Boot Sequence
Boot mode Displays the boot mode.
Boot Sequence Displays the boot sequence.
Secure Digital (SD) Card Boot Enable or disable the SD card read-only boot.
By default, the Secure Digital (SD) Card Boot option is not enabled.
Secure Boot
Enable Secure Boot Enable or disable the secure boot feature.
By default, the option is not enabled.
Secure Boot Mode Enable or disable to change the secure boot mode options.
By default, the Deployed Mode is enabled.
Expert Key Management
Enable Custom Mode Enable or disable custom mode.
By default, the custom mode option is not enabled.
Custom Mode Key Management Select the custom values for expert key management.
Table 7. System setup options—Integrated Devices menu
Integrated Devices
Date/Time Displays the current date in MM/DD/YYYY format and current time in
HH:MM:SS AM/PM format.
Camera Enables or disable the camera.
By default, the Enable Camera option is selected
Audio
Enable Audio Enable or disable the integrated audio controller.
By default, all the options are enabled.
USB/Thunderbolt Configuration ●Enable or disable booting from USB mass storage devices connected to
external USB ports.
By default, the Enable External USB Ports option is enabled.
●Enable or disable booting from USB mass storage devices such as external
hard drive, optical drive, and USB drive.
By default, the Enable USB Boot Support option is enabled.
Enable Thunderbolt Technology
Support
Enable or disable the associated ports and adapters.
By default, the Enable Thunderbolt Technology Support option is selected.
Enable Thunderbolt Boot Support Enable or disable the Thunderbolt adapter peripheral device and USB devices
connected to the Thunderbolt adapter to be used during BIOS Pre-boot.
By default, the Enable Thunderbolt Boot Support option is disabled.
Enable Thunderbolt (and PCIe behind
TBT) pre-boot modules
Enable or disable the PCIe devices that are connected through a Thunderbolt
adapter to execute the PCIe devices UEFI Option ROM (if present) during
pre-boot.
By default, the Enable Thunderbolt (and PCIe behind TBT) pre-boot
modules option is disabled.
Disable USB4 PCIE Tunneling Disable the USB4 PCIE Tunneling option.
90 BIOS setup
Table 7. System setup options—Integrated Devices menu (continued)
Integrated Devices
By default, the option is disabled.
Video/Power only on Type-C Ports Enable or disable the Type-C port functionality to video or only power.
By default, the Video/Power only on Type-C Ports option is disabled.
Type-C Dock Override Enables to use connected Type-C Dell Dock to provide data stream with
external USB ports disabled. When Type-C Dock override is enabled, the
Video/Audio/Lan submenu is activated.
By default, the Type-C Dock Override option is enabled.
Video Enable or disable the usage of video on Dell Dock external ports.
By default, the Video option is disabled.
Audio Enable or disable the usage of audio on Dell Dock external ports.
By default, the Audio option is enabled.
Lan Enable or disable the usage of LAN on Dell Dock external ports.
By default, the Lan option is enabled.
Miscellaneous Devices Enable or disable Fingerprint Reader device.
By default, the Enable Fingerprint Reader Device option is enabled.
Unobtrusive Mode
Enable Unobtrusive Mode Enable or disable all the computer light and sound.
By default, the Enable Unobtrusive Mode option is disabled.
Table 8. System setup options—Storage menu
Storage
SATA/NVMe Operation
SATA/NVMe Operation Set the operating mode of the integrated storage device controller. By default,
the RAID On option is enabled.
SMART Reporting
Enable SMART Reporting Enable or disable Self-Monitoring, Analysis, and Reporting Technology
(SMART) during computer startup.
By default, the Enable SMART Reporting option is not enabled.
Drive Information
SATA-1
Type Displays the SATA-1 type information of the computer.
Device Displays the SATA-1 device information of the computer.
M.2 PCIe SSD-1
Type Displays the M.2 PCIe SSD-1 type information of the computer.
Device Displays the M.2 PCIe SSD-1 device information of the computer.
M.2 PCIe SSD-2
Type Displays the M.2 PCIe SSD-2 type information of the computer.
Device Displays the M.2 PCIe SSD-2 device information of the computer.
Enable MediaCard
Secure Digital (SD) Card Enable or disable the SD card.
BIOS setup 91
Table 8. System setup options—Storage menu (continued)
Storage
By default, the Secure Digital (SD) Card option is enabled.
Secure Digital (SD) Card Read-Only Mode Enable or disable the SD card read-only mode.
By default, the Secure Digital (SD) Card Read-Only Mode option is not
enabled.
Table 9. System setup options—Display menu
Display
Display Brightness
Brightness on battery power Enable to set screen brightness when the computer is running on battery
power.
Brightness on AC power Enable to set screen brightness when the computer is running on AC power.
Full Screen Logo Enable or disable full screen logo.
By default, the option is not enabled.
Table 10. System setup options—Connection menu
Connection
Network Controller Configuration
Integrated NIC Controls the on-board LAN controller.
By default, the Enabled with PXE option is enabled.
Enable UEFI Network Stack Enable or disable UEFI Network Stack.
By default, the Enable UEFI Network Stack and Enabled w/PXE option are
enabled.
Wireless Device Enable
WWAN/GPS Enable or disable the internal WWAN/GPS device
By default, the option enabled.
WWAN Bus Mode Set the interface type of the Wireless Wan (WWAN) card.
By default, the Bus Mode PCIe option is enabled.
WLAN Enable or disable the internal WLAN device
By default, the option enabled.
Bluetooth Enable or disable the internal Bluetooth device
By default, the option enabled.
Contactless smartcard/NFC Enable or disable the internal Contactless smartcard/NFC device
By default, the option enabled.
Enable UEFI Network Stack Enable or disable UEFI Network Stack and controls the on-board LAN
Controller.
By default, the Enable UEFI Network Stack option are enabled.
Wireless Radio Control
Control WLAN radio Sense the connection of the computer to a wired network and subsequently
disable the selected wireless radios (WLAN).
By default, the option is disabled.
92 BIOS setup
Table 10. System setup options—Connection menu (continued)
Connection
Control WWAN radio Sense the connection of the computer to a wired network and subsequently
disable the selected wireless radios (WWAN).
By default, the option is disabled.
HTTPs Boot Feature
HTTPs Boot Enable or disable the HTTPs Boot feature.
By default, the HTTPs Boot option is enabled.
HTTPs Boot Mode With Auto Mode, the HTTPs Boot extracts Boot URL from the DHCP. With
Manual Mode, the HTTPs Boot reads Boot URL from the user-provided data.
By default, the Auto Mode option is enabled.
Table 11. System setup options—Power menu
Power
Battery configuration Enables the computer to run on battery during peak power usage hours. Use
the table Custom Charge Start and Custom Charge Stop, to prevent AC
power usage between certain times of each day.
By default, the Adaptive option is enabled.
Advanced Configuration
Enable Advanced Battery Charge
Configuration
Enable or disable the advanced battery charge configuration.
By default, the Enable Advanced Battery Charge Configuration option is
disabled.
Peak Shift Enables the computer to run on battery during peak power usage hours.
By default, the Enable Peak Shift option is enabled.
Enable Peak Shift
USB PowerShare
Enable USB PowerShare Enable or disable the USB PowerShare.
By default, the Enable USB PowerShare option is disabled
Thermal Management Enables to cool the fan and processor heat management to adjust the
computer performance, noise, and temperature.
By default, the Optimized option is enabled.
USB Wake Support
Wake on Dell USB-C Dock When enabled, connecting a Dell USB-C Dock will wake the computer from
standby.
By default, the Wake on Dell USB-C Dock option is enabled.
Block Sleep Enables to block entering sleep (S3) mode in the operating system.
By default, the Block Sleep option is disabled.
Lid Switch Enable or disable the lid switch.
By default, the Lid Switch option is enabled.
Intel Speed Shift Technology Enable or disable the Intel speed shift technology support.
By default, the Intel Speed Shift Technology option is enabled.
Long Life Cycle Primary Battery By default, the Normal Battery option is enabled.
BIOS setup 93
Table 12. System setup options—Security menu
Security
TPM 2.0 Security
TPM 2.0 Security On Enable or disable TPM 2.0 security options.
By default, the TPM 2.0 Security On option is enabled.
Attestation Enable Enables to control whether the Trusted Platform Module (TPM) Endorsement
Hierarchy is available to the operating system.
By default, the Attestation Enable option is enabled.
Key Storage Enable Enables to control whether the Trusted Platform Module (TPM) Storage
Hierarchy is available to the operating system.
By default, the Key Storage Enable option is enabled.
SHA-256 BIOS and the TPM will use the SHA-256 hash algorithm to extend
measurements into the TPM PCRs during BIOS boot.
By default, the SHA-256 option is enabled.
Clear Enables to clear the TPM owner information and returns the TPM to the
default state.
By default, the Clear option is disabled.
PPI ByPass for Clear Commands Controls the TPM Physical Presence Interface (PPI).
By default, the PPI ByPass for clear Commands option is disabled.
Intel Total Memory Encryption
Total Memory Encryption Enable or disable you to protect memory from physical attacks including freeze
spray, probing DDR to read the cycles, and others.
By default, the Total Memory Encryption option is disabled.
Chassis intrusion Controls the chassis intrusion feature.
By default, the On-Silent option is enabled.
SMM Security Mitigation Enable or disable SMM Security Mitigation.
By default, the option is enabled.
Data Wipe on Next Boot
Start Data Wipe Enable or disable the data wipe on next boot.
By default, the option is enabled.
Absolute Enable or disable or permanently disable the BIOS module interface of the
optional Absolute Persistence Module service from Absolute software.
By default, the option is enabled.
UEFI Boot Path Security Controls whether or not the computer will prompt the user to enter the admin
password (if set) when booting to a UEFI boot device from the F12 boot menu.
By default, the Always Except Internal HDD option is enabled.
Table 13. System setup options—Passwords menu
Passwords
Admin Password Set, change, or delete the administrator password.
System Password Set, change, or delete the computer password.
NVMe SSD0 Set, change, or delete the NVMe SSD0 password.
Password Configuration
94 BIOS setup
Table 13. System setup options—Passwords menu (continued)
Passwords
Upper Case Letter Reinforces password must have at least one upper case letter.
By default, the option is disabled.
Lower Case Letter Reinforces password must have at least one lower case letter.
By default, the option is disabled.
Digit Reinforces password must have at least one digit.
By default, the option is disabled.
Special Character Reinforces password must have at least one special character.
By default, the option is disabled.
Minimum Characters Set the minimum characters allowed for password.
Password Bypass When enabled, this always prompts for computer and internal hard drive
passwords when powered on from the off state.
By default, the Disabled option is enabled.
Password Changes
Enable Non-Admin Password Changes Enable or disable to change computer and hard drive password without the
need for admin password.
By default, the option is enabled.
Admin Setup Lockout
Enable Admin Setup Lockout Enables administrators control over how their users can or cannot access BIOS
setup.
By default, the option is disabled.
Master Password Lockout
Enable Master Password Lockout When enabled, this will disable the master password support.
By default, the option is disabled.
Allow Non-Admin PSID Revert
Enable Allow Non-Admin PSID Revert Controls access to the Physical Security ID (PSID) revert of NVMe hard-drives
from the Dell Security Manager prompt.
By default, the option is disabled.
Table 14. System setup options—Update, Recovery menu
Update, Recovery
UEFI Capsule Firmware Updates Enable or disable BIOS updates through UEFI capsule update packages.
By default, the option is enabled.
BIOS Recovery from Hard Drive Enables the user to recover from certain corrupted BIOS conditions from a
recovery file on the user primary hard drive or an external USB key.
By default, the option is enabled.
BIOS Downgrade
Allow BIOS Downgrade Enable or disable the flashing of the computer firmware to previous revision is
blocked.
By default, the option is enabled.
SupportAssist OS Recovery Enable or disable the boot flow for SupportAssist OS Recovery tool in the
event of certain computer errors.
BIOS setup 95
Table 14. System setup options—Update, Recovery menu (continued)
Update, Recovery
By default, the option is enabled.
BISOConnect Enable or disable cloud Service OS recovery if the main operating system fails
to boot with the number of failures equal to or greater than the value specified
by the Auto OS Recovery Threshold setup option and local Service OS does not
boot or is not installed.
By default, the option is enabled.
Dell Auto OS Recovery Threshold Controls the automatic boot flow for SupportAssist System Resolution Console
and for Dell OS Recovery Tool.
By default, the threshold value is set to 2.
Table 15. System setup options—System Management menu
System Management
Service Tag Display the Service Tag of the computer.
Asset Tag Create a computer Asset Tag.
AC Behavior
Wake on AC Enable or disable the wake on AC option.
By default, the option is disabled.
Wake on LAN
Wake on LAN Enable or disable the computer to power on by special LAN signals when it
receives a wakeup signal from the WLAN.
By default, the Disabled option is selected.
Auto on Time Enable to set the computer to turn on automatically every day or on a
preselected date and time. This option can be configured only if the Auto On
Time is set to Everyday, Weekdays, or Selected Days.
By default, the option is disabled.
Table 16. System setup options—Keyboard menu
Keyboard
Numlock Enable Enable or disable the Numlock function when the computer boots.
By default, the option is enabled.
Fn Lock Options By default, the Fn lock option is enabled.
Keyboard Illumination Enables to change the keyboard illumination settings.
By default, the Bright option is enabled.
Keyboard Backlight Timeout on AC Set the timeout value for the keyboard backlight when an AC adapter is
connected to the computer.
By default, the 10 seconds option is enabled.
Keyboard Backlight Timeout on
Battery
Set the timeout value for the keyboard backlight when the is running only on
battery power.
By default, the 10 seconds option is enabled.
Device Configuration Hotkey Access Manages whether you can access device configuration screens through
hotkeys during computer startup.
By default, the option is enabled.
96 BIOS setup
Table 17. System setup options—Pre-boot Behavior menu
Pre-boot Behavior
Adapter Warnings
Enable Adapter Warnings Enable or disable the warning messages during boot when the adapters with
less power capacity are detected.
By default, the option is enabled.
Warning and Errors Enable or disable the action to be done when a warning or error is encountered.
By default, the Prompt on Warnings and Errors option is enabled.
Fastboot Enable to set the speed of the boot process.
By default, the Minimal option is enabled.
Extend BIOS POST Time Set the BIOS POST time.
By default, the 0 seconds option is enabled.
MAC Address Pass-Through Replaces the external NIC MAC address with the selected MAC address from
the computer.
By default, the System Unique MAC Address option is enabled.
Table 18. System setup options—Performance menu
Performance
Multi Core Support
Active Cores Enables to change the number of CPU cores available to the operating system.
By default, the All Cores options is enabled.
Intel SpeedStep
Enable Intel SpeedStep Technology Enables the computer to dynamically adjust processor voltage and core
frequency, decreasing average power consumption and heat production.
By default, the option is enabled.
C-States Control
Enable C-State Control Enable or disable additional processor sleep states.
By default, the option is enabled.
Intel TurbocBoost Technology
Enable Intel Turbo Boost Technology Enable or disable Intel TurboBoost mode of the processor.
By default, the option is enabled.
Intel Hyper-Threading Technology
Enable Intel Hyper-Threading Technology Enable or disable Hyper-Threading in the processor.
By default, the option is enabled.
Dynamic Tuning:Machine Learning
Enable Dynamic Tuning:Machine Learning Enables the operating system capability to enhance dynamic power tuning
capabilities based on detected workloads.
By default, the option is disabled.
Table 19. System setup options—System Logs menu
System Logs
BIOS Event Log
Clear Bios Event Log Display BIOS events.
BIOS setup 97
Table 19. System setup options—System Logs menu (continued)
System Logs
By default, the Keep option is enabled.
Thermal Event Log
Clear Thermal Event Log Display Thermal events.
By default, the Keep option is enabled.
Power Event Log
Clear Power Event Log Display power events.
By default, the Keep option is enabled.
License Information Displays the license information of the computer.
Updating the BIOS
Updating the BIOS in Windows
About this task
CAUTION: If BitLocker is not suspended before updating the BIOS, the next time you reboot the system it
will not recognize the BitLocker key. You will then be prompted to enter the recovery key to progress and the
system will ask for this on each reboot. If the recovery key is not known this can result in data loss or an
unnecessary operating system re-install. For more information on this subject, see Knowledge Article: https://
www.dell.com/support/article/sln153694
Steps
1. Go to www.dell.com/support.
2. Click Product support. In the Search support box, enter the Service Tag of your computer, and then click Search.
NOTE: If you do not have the Service Tag, use the SupportAssist feature to automatically identify your computer. You
can also use the product ID or manually browse for your computer model.
3. Click Drivers & Downloads. Expand Find drivers.
4. Select the operating system installed on your computer.
5. In the Category drop-down list, select BIOS.
6. Select the latest version of BIOS, and click Download to download the BIOS file for your computer.
7. After the download is complete, browse the folder where you saved the BIOS update file.
8. Double-click the BIOS update file icon and follow the on-screen instructions.
For more information, see knowledge base article 000124211 at www.dell.com/support.
Updating the BIOS in Linux and Ubuntu
To update the system BIOS on a computer that is installed with Linux or Ubuntu, see the knowledge base article 000131486 at
www.dell.com/support.
Updating the BIOS using the USB drive in Windows
About this task
CAUTION: If BitLocker is not suspended before updating the BIOS, the next time you reboot the system it
will not recognize the BitLocker key. You will then be prompted to enter the recovery key to progress and the
98 BIOS setup
system will ask for this on each reboot. If the recovery key is not known this can result in data loss or an
unnecessary operating system re-install. For more information on this subject, see Knowledge Article: https://
www.dell.com/support/article/sln153694
Steps
1. Follow the procedure from step 1 to step 6 in Updating the BIOS in Windows to download the latest BIOS setup program file.
2. Create a bootable USB drive. For more information, see the knowledge base article 000145519 at www.dell.com/support.
3. Copy the BIOS setup program file to the bootable USB drive.
4. Connect the bootable USB drive to the computer that needs the BIOS update.
5. Restart the computer and press F12 .
6. Select the USB drive from the One Time Boot Menu.
7. Type the BIOS setup program filename and press Enter.
The BIOS Update Utility appears.
8. Follow the on-screen instructions to complete the BIOS update.
Updating the BIOS from the F12 One-Time boot menu
Update your computer BIOS using the BIOS update.exe file that is copied to a FAT32 USB drive and booting from the F12
One-Time boot menu.
About this task
CAUTION: If BitLocker is not suspended before updating the BIOS, the next time you reboot the system it
will not recognize the BitLocker key. You will then be prompted to enter the recovery key to progress and the
system will ask for this on each reboot. If the recovery key is not known this can result in data loss or an
unnecessary operating system re-install. For more information on this subject, see Knowledge Article: https://
www.dell.com/support/article/sln153694
BIOS Update
You can run the BIOS update file from Windows using a bootable USB drive or you can also update the BIOS from the F12
One-Time boot menu on the computer.
Most of the Dell computers built after 2012 have this capability, and you can confirm by booting your computer to the F12
One-Time Boot Menu to see if BIOS FLASH UPDATE is listed as a boot option for your computer. If the option is listed, then the
BIOS supports this BIOS update option.
NOTE: Only computers with BIOS Flash Update option in the F12 One-Time boot menu can use this function.
Updating from the One-Time boot menu
To update your BIOS from the F12 One-Time boot menu, you need the following:
●USB drive formatted to the FAT32 file system (key does not have to be bootable)
●BIOS executable file that you downloaded from the Dell Support website and copied to the root of the USB drive
●AC power adapter that is connected to the computer
●Functional computer battery to flash the BIOS
Perform the following steps to perform the BIOS update flash process from the F12 menu:
CAUTION: Do not turn off the computer during the BIOS update process. The computer may not boot if you turn
off your computer.
Steps
1. From a turn off state, insert the USB drive where you copied the flash into a USB port of the computer.
2. Turn on the computer and press F12 to access the One-Time Boot Menu, select BIOS Update using the mouse or arrow keys
then press Enter.
The flash BIOS menu is displayed.
3. Click Flash from file.
4. Select external USB device.
BIOS setup 99
5. Select the file and double-click the flash target file, and then click Submit.
6. Click Update BIOS. The computer restarts to flash the BIOS.
7. The computer will restart after the BIOS update is completed.
System and setup password
Table 20. System and setup password
Password type Description
System password Password that you must enter to log in to your system.
Setup password Password that you must enter to access and make changes to
the BIOS settings of your computer.
You can create a system password and a setup password to secure your computer.
CAUTION: The password features provide a basic level of security for the data on your computer.
CAUTION: Anyone can access the data that is stored on your computer if it is not locked and left unattended.
NOTE: System and setup password feature is disabled.
Assigning a system setup password
Prerequisites
You can assign a new System or Admin Password only when the status is in Not Set.
About this task
To enter the system setup, press F12 immediately after a power-on or reboot.
Steps
1. In the System BIOS or System Setup screen, select Security and press Enter.
The Security screen is displayed.
2. Select System/Admin Password and create a password in the Enter the new password field.
Use the following guidelines to assign the system password:
●At least one special character: ! " # $ % & ' ( ) * + , - . / : ; < = > ? @ [ \ ] ^ _ ` { | }
●Numbers 0 through 9.
●Upper case letters from A to Z.
●Lower case letters from a to z.
3. Type the system password that you entered earlier in the Confirm new password field and click OK.
4. Press Esc and save the changes as prompted by the pop-up message.
5. Press Y to save the changes.
The computer restarts.
Deleting or changing an existing system setup password
Prerequisites
Ensure that the Password Status is Unlocked (in the System Setup) before attempting to delete or change the existing
System and/or Setup password. You cannot delete or change an existing System or Setup password, if the Password Status is
Locked.
100 BIOS setup
About this task
To enter the System Setup, press F12 immediately after a power-on or reboot.
Steps
1. In the System BIOS or System Setup screen, select System Security and press Enter.
The System Security screen is displayed.
2. In the System Security screen, verify that Password Status is Unlocked.
3. Select System Password, update, or delete the existing system password, and press Enter or Tab.
4. Select Setup Password, update, or delete the existing setup password, and press Enter or Tab.
NOTE: If you change the System and/or Setup password, reenter the new password when prompted. If you delete the
System and/or Setup password, confirm the deletion when prompted.
5. Press Esc and a message prompts you to save the changes.
6. Press Y to save the changes and exit from System Setup.
The computer restarts.
Clearing BIOS (System Setup) and System passwords
About this task
To clear the system or BIOS passwords, contact Dell technical support as described at www.dell.com/contactdell.
NOTE: For information on how to reset Windows or application passwords, refer to the documentation accompanying
Windows or your application.
BIOS setup 101
Troubleshooting
Topics:
•Handling swollen Lithium-ion batteries
•Dell SupportAssist Pre-boot System Performance Check diagnostics
•Built-in self-test (BIST)
•System diagnostic lights
•Recovering the operating system
•Backup media and recovery options
•WiFi power cycle
•Drain residual flea power (perform hard reset)
Handling swollen Lithium-ion batteries
Like most laptops, Dell laptops use lithium-ion batteries. One type of lithium-ion battery is the lithium-ion polymer battery.
Lithium-ion polymer batteries have increased in popularity in recent years and have become standard in the electronics industry
due to customer preferences for a slim form factor (especially with newer ultra-thin laptops) and long battery life. Inherent to
lithium-ion polymer battery technology is the potential for swelling of the battery cells.
Swollen battery may impact the performance of the laptop. To prevent possible further damage to the device enclosure or
internal components leading to malfunction, discontinue the use of the laptop and discharge it by disconnecting the AC adapter
and letting the battery drain.
Swollen batteries should not be used and should be replaced and disposed of properly. We recommend contacting Dell product
support for options to replace a swollen battery under the terms of the applicable warranty or service contract, including options
for replacement by a Dell authorized service technician.
The guidelines for handling and replacing Lithium-ion batteries are as follows:
●Exercise caution when handling Lithium-ion batteries.
●Discharge the battery before removing it from the system. To discharge the battery, unplug the AC adapter from the system
and operate the system only on battery power. When the system will no longer power on when the power button is pressed,
the battery is fully discharged.
●Do not crush, drop, mutilate, or penetrate the battery with foreign objects.
●Do not expose the battery to high temperatures, or disassemble battery packs and cells.
●Do not apply pressure to the surface of the battery.
●Do not bend the battery.
●Do not use tools of any type to pry on or against the battery.
●If a battery gets stuck in a device as a result of swelling, do not try to free it as puncturing, bending, or crushing a battery
can be dangerous.
●Do not attempt to reassemble a damaged or swollen battery into a laptop.
●Swollen batteries that are covered under warranty should be returned to Dell in an approved shipping container (provided
by Dell)—this is to comply with transportation regulations. Swollen batteries that are not covered under warranty should be
disposed of at an approved recycling center. Contact Dell product support at https://www.dell.com/support for assistance
and further instructions.
●Using a non-Dell or incompatible battery may increase the risk of fire or explosion. Replace the battery only with a
compatible battery purchased from Dell that is designed to work with your Dell computer. Do not use a battery from other
computers with your computer. Always purchase genuine batteries from https://www.dell.com or otherwise directly from
Dell.
Lithium-ion batteries can swell for various reasons such as age, number of charge cycles, or exposure to high heat. For more
information on how to improve the performance and lifespan of the laptop battery and to minimize the possibility of occurrence
of the issue, see Dell Laptop Battery - Frequently Asked Questions.
6
102 Troubleshooting
Dell SupportAssist Pre-boot System Performance
Check diagnostics
About this task
SupportAssist diagnostics (also known as system diagnostics) performs a complete check of your hardware. The Dell
SupportAssist Pre-boot System Performance Check diagnostics is embedded with the BIOS and is launched by the BIOS
internally. The embedded system diagnostics provides a set of options for particular devices or device groups allowing you to:
●Run tests automatically or in an interactive mode
●Repeat tests
●Display or save test results
●Run thorough tests to introduce additional test options to provide extra information about the failed device(s)
●View status messages that inform you if tests are completed successfully
●View error messages that inform you of problems encountered during testing
NOTE: Some tests for specific devices require user interaction. Always ensure that you are present at the computer
terminal when the diagnostic tests are performed.
For more information, see https://www.dell.com/support/kbdoc/000180971.
Running the SupportAssist Pre-Boot System Performance Check
Steps
1. Turn on your computer.
2. As the computer boots, press the F12 key as the Dell logo appears.
3. On the boot menu screen, select the Diagnostics option.
4. Click the arrow at the bottom left corner.
Diagnostics front page is displayed.
5. Click the arrow in the lower-right corner to go to the page listing.
The items detected are listed.
6. To run a diagnostic test on a specific device, press Esc and click Yes to stop the diagnostic test.
7. Select the device from the left pane and click Run Tests.
8. If there are any issues, error codes are displayed.
Note the error code and validation number and contact Dell.
Built-in self-test (BIST)
M-BIST
M-BIST (Built In Self-Test) is the system board's built-in self-test diagnostics tool that improves the diagnostics accuracy of
system board embedded controller (EC) failures.
NOTE: M-BIST can be manually initiated before POST (Power On Self Test).
How to run M-BIST
NOTE: M-BIST must be initiated on the system from a power-off state either connected to AC power or with battery only.
1. Press and hold both the M key on the keyboard and the power button to initiate M-BIST.
2. With both the M key and the power button held down, the battery indicator LED may exhibit two states:
a. OFF: No fault detected with the system board
b. AMBER: Indicates a problem with the system board
3. If there is a failure with the system board, the battery status LED will flash one of the following error codes for 30 seconds:
Troubleshooting 103
Table 21. LED error codes
Blinking Pattern Possible Problem
Amber White
2 1 CPU Failure
2 8 LCD Power Rail Failure
1 1 TPM Detection Failure
2 4 Unrecoverable SPI Failure
4. If there is no failure with the system board, the LCD will cycle through the solid color screens described in the LCD-BIST
section for 30 seconds and then power off.
LCD Power rail test (L-BIST)
L-BIST is an enhancement to the single LED error code diagnostics and is automatically initiated during POST. L-BIST will check
the LCD power rail. If there is no power being supplied to the LCD (i.e., the L-BIST circuit fails), the battery status LED will flash
either an error code [2,8] or an error code [2,7].
NOTE: If L-BIST fails, LCD-BIST cannot function as no power will be supplied to the LCD.
How to invoke L-BIST Test:
1. Press the power button to start the system.
2. If the system does not start up normally, look at the battery status LED:
●If the battery status LED flashes an error code [2,7], the display cable may not be connected properly.
●If the battery status LED flashes an error code [2,8], there is a failure on the LCD power rail of the system board, hence
there is no power supplied to the LCD.
3. For cases, when a [2,7] error code is shown, check to see if the display cable is properly connected.
4. For cases when a [2,8] error code is shown, replace the system board.
LCD Built-in Self Test (BIST)
Dell laptops have a built-in diagnostic tool that helps you determine if the screen abnormality you are experiencing is an inherent
problem with the LCD (screen) of the Dell laptop or with the video card (GPU) and PC settings.
When you notice screen abnormalities like flickering, distortion, clarity issues, fuzzy or blurry image, horizontal or vertical lines,
color fade etc., it is always a good practice to isolate the LCD (screen) by running the Built-In Self Test (BIST).
How to invoke LCD BIST Test
1. Power off the Dell laptop.
2. Disconnect any peripherals that are connected to the laptop. Connect only the AC adapter (charger) to the laptop.
3. Ensure that the LCD (screen) is clean (no dust particles on the surface of the screen).
4. Press and hold D key and Power on the laptop to enter LCD built-in self test (BIST) mode. Continue to hold the D key, until
the system boots up.
5. The screen will display solid colors and change colors on the entire screen to white, black, red, green, and blue twice.
6. Then it will display the colors white, black and red.
7. Carefully inspect the screen for abnormalities (any lines, fuzzy color or distortion on the screen).
8. At the end of the last solid color (red), the system will shut down.
NOTE: Dell SupportAssist Pre-boot diagnostics upon launch, initiates an LCD BIST first, expecting a user intervention
confirm functionality of the LCD.
104 Troubleshooting
System diagnostic lights
Battery-status light
Indicates the power and battery-charge status.
Solid white — Power adapter is connected and the battery has more than 5 percent charge.
Amber — Computer is running on battery and the battery has less than 5 percent charge.
Off
●Power adapter is connected and the battery is fully charged.
●Computer is running on battery and the battery has more than 5 percent charge.
●Computer is in sleep state, hibernation, or turned off.
The power and battery-status light blinks amber along with beep codes indicating failures.
For example, the power and battery-status light blinks amber two times followed by a pause, and then blinks white three times
followed by a pause. This 2,3 pattern continues until the computer is turned off indicating no memory or RAM is detected.
The following table shows different power and battery-status light patterns and associated problems.
Blinking Pattern Problem description Suggested resolution
1 1 TPM detection failure Replace the system board.
1 2 Unrecoverable SPI flash
failure
Replace the system board.
1 5 EC unable to program i-Fuse Replace the system board.
1 6 Generic catch-all for
ungraceful EC code flow
errors
Disconnect all power source
(AC, battery, coin cell) and
drain flea power by pressing &
holding down power button.
2 1 CPU failure Run the Intel CPU diagnostics
tools. If problem persists,
replace the system board.
2 2 System Board failure
(included BIOS corruption or
ROM error)
Flash latest BIOS version. If
problem persists, replace the
system board.
2 3 No Memory / RAM detected Confirm that the memory
module is installed properly. If
problem persists, replace the
memory module.
2 4 Memory / RAM failure Reset and swap memory
modules amongst the slots. If
problem persists, replace the
memory module.
2 5 Invalid memory installed Reset and swap memory
modules amongst the slots. If
problem persists, replace the
memory module.
2 6 System board / Chipset Error Replace the system board.
2 7 LCD failure (SBIOS message) Replace the LCD module.
2 8 LCD failure (EC detection of
power rail failure)
Replace the system board.
3 1 CMOS battery failure Reset the CMOS battery
connection. If problem
persists, replace the RTC
battery.
Troubleshooting 105
Blinking Pattern Problem description Suggested resolution
3 2 PCI or Video card/chip failure Replace the system board.
3 3 BIOS recovery image not
found
Flash latest BIOS version. If
problem persists, replace the
system board.
3 4 BIOS recovery image found
but invalid
Flash latest BIOS version. If
problem persists, replace the
system board.
3 5 Power rail failure Replace the system board.
3 6 Flash corruption detected by
SBIOS.
Replace the system board.
3 7 Timeout waiting on ME to
reply to HECI message.
Replace the system board.
Camera status light: Indicates whether the camera is in use.
●Solid white — Camera is in use.
●Off — Camera is not in use.
Caps Lock status light: Indicates whether Caps Lock is enabled or disabled.
●Solid white — Caps Lock enabled.
●Off — Caps Lock disabled.
Recovering the operating system
When your computer is unable to boot to the operating system even after repeated attempts, it automatically starts Dell
SupportAssist OS Recovery.
Dell SupportAssist OS Recovery is a standalone tool that is preinstalled in all Dell computers installed with Windows operating
system. It consists of tools to diagnose and troubleshoot issues that may occur before your computer boots to the operating
system. It enables you to diagnose hardware issues, repair your computer, back up your files, or restore your computer to its
factory state.
You can also download it from the Dell Support website to troubleshoot and fix your computer when it fails to boot into their
primary operating system due to software or hardware failures.
For more information about the Dell SupportAssist OS Recovery, see Dell SupportAssist OS Recovery User's Guide at
www.dell.com/serviceabilitytools. Click SupportAssist and then, click SupportAssist OS Recovery.
Backup media and recovery options
It is recommended to create a recovery drive to troubleshoot and fix problems that may occur with Windows. Dell proposes
multiple options for recovering Windows operating system on your Dell PC. For more information. see Dell Windows Backup
Media and Recovery Options.
WiFi power cycle
About this task
If your computer is unable to access the internet due to WiFi connectivity issues a WiFi power cycle procedure may be
performed. The following procedure provides the instructions on how to conduct a WiFi power cycle:
NOTE: Some ISPs (Internet Service Providers) provide a modem/router combo device.
Steps
1. Turn off your computer.
106 Troubleshooting
2. Turn off the modem.
3. Turn off the wireless router.
4. Wait for 30 seconds.
5. Turn on the wireless router.
6. Turn on the modem.
7. Turn on your computer.
Drain residual flea power (perform hard reset)
About this task
Flea power is the residual static electricity that remains in the computer even after it has been powered off and the battery is
removed.
For your safety, and to protect the sensitive electronic components in your computer, you are requested to drain residual flea
power before removing or replacing any components in your computer.
Draining residual flea power, also known as a performing a "hard reset", is also a common troubleshooting step if your computer
does not power on or boot into the operating system.
To drain residual flea power (perform a hard reset)
Steps
1. Turn off your computer.
2. Disconnect the power adapter from your computer.
3. Remove the base cover.
4. Remove the battery.
5. Press and hold the power button for 20 seconds to drain the flea power.
6. Install the battery.
7. Install the base cover.
8. Connect the power adapter to your computer.
9. Turn on your computer.
NOTE: For more information about performing a hard reset, see the knowledge base article 000130881 at
www.dell.com/support.
Troubleshooting 107
Getting help and contacting Dell
Self-help resources
You can get information and help on Dell products and services using these self-help resources:
Table 22. Self-help resources
Self-help resources Resource location
Information about Dell products and services www.dell.com
Tips
Contact Support In Windows search, type Contact Support, and press
Enter.
Online help for operating system www.dell.com/support/windows
www.dell.com/support/linux
Troubleshooting information, user manuals, setup instructions,
product specifications, technical help blogs, drivers, software
updates, and so on.
www.dell.com/support
Dell knowledge base articles for a variety of computer
concerns. 1. Go to https://www.dell.com/support/home/?
app=knowledgebase.
2. Type the subject or keyword in the Search box.
3. Click Search to retrieve the related articles.
Contacting Dell
To contact Dell for sales, technical support, or customer service issues, see www.dell.com/contactdell.
NOTE: Availability varies by country and product, and some services may not be available in your country.
NOTE: If you do not have an active internet connection, you can find contact information on your purchase invoice, packing
slip, bill, or Dell product catalog.
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108 Getting help and contacting Dell