Table of Contents
- Dell Latitude 7400 2-in-1 Service Manual
- Contents
- Working on your computer
- Technology and components
- Major components of your system
- Removing and installing components
- System setup
- Troubleshooting
- Getting help
DELL 7400 2-in-1 User Manual
Displayed below is the user manual for 7400 2-in-1 by DELL which is a product in the Notebooks category. This manual has pages.
Related Manuals
Dell Latitude 7400 2-in-1
Service Manual
Regulatory Model: P110G
Regulatory Type: P110G001
August 2021
Rev. A03
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.
© 2019 - 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 on your computer........................................................................................... 6
Safety instructions.............................................................................................................................................................. 6
Turning off your computer — Windows 10...................................................................................................................6
Before working inside your computer............................................................................................................................. 7
After working inside your computer................................................................................................................................7
Chapter 2: Technology and components........................................................................................ 8
USB features........................................................................................................................................................................ 8
USB Type-C........................................................................................................................................................................ 10
HDMI 1.4a..............................................................................................................................................................................11
Corning Gorilla Glass......................................................................................................................................................... 12
Benefits...........................................................................................................................................................................12
Chapter 3: Major components of your system ............................................................................. 15
Chapter 4: Removing and installing components.......................................................................... 17
Recommended tools.......................................................................................................................................................... 17
Screw List............................................................................................................................................................................ 17
SD memory card.................................................................................................................................................................18
Removing the SD memory card................................................................................................................................ 18
Installing the SD memory card.................................................................................................................................. 19
SIM card tray......................................................................................................................................................................20
Removing the SIM card tray.....................................................................................................................................20
Installing the SIM card tray........................................................................................................................................21
Base cover.......................................................................................................................................................................... 22
Removing the base cover..........................................................................................................................................22
Installing the base cover............................................................................................................................................ 26
Battery cable...................................................................................................................................................................... 30
Disconnecting the battery cable..............................................................................................................................30
Connecting the battery cable....................................................................................................................................31
Coin cell............................................................................................................................................................................... 32
Removing the coin cell battery................................................................................................................................ 32
Installing the coin-cell battery.................................................................................................................................. 33
Solid state drive................................................................................................................................................................. 34
Removing the solid state drive.................................................................................................................................34
Installing the solid state drive...................................................................................................................................36
WLAN card..........................................................................................................................................................................38
Removing the WLAN card.........................................................................................................................................38
Installing the WLAN card........................................................................................................................................... 39
WWAN card........................................................................................................................................................................ 40
Removing the WWAN card....................................................................................................................................... 40
Installing the WWAN card......................................................................................................................................... 42
Fan........................................................................................................................................................................................ 44
Removing the fan........................................................................................................................................................ 44
Contents
Contents 3
Installing the fan.......................................................................................................................................................... 48
Speakers.............................................................................................................................................................................. 52
Removing the speakers..............................................................................................................................................52
Installing the speakers................................................................................................................................................53
Heatsink...............................................................................................................................................................................55
Removing the heatsink.............................................................................................................................................. 55
Installing the heatsink.................................................................................................................................................59
Display assembly................................................................................................................................................................63
Removing the display assembly............................................................................................................................... 63
Installing the display assembly................................................................................................................................. 66
Battery................................................................................................................................................................................. 68
Lithium-ion battery precautions...............................................................................................................................68
Removing the battery.................................................................................................................................................69
Installing the battery....................................................................................................................................................71
System board......................................................................................................................................................................73
Removing the system board..................................................................................................................................... 73
Installing the system board....................................................................................................................................... 78
Keyboard............................................................................................................................................................................. 83
Removing the keyboard............................................................................................................................................. 83
Installing the keyboard............................................................................................................................................... 88
Palmrest assembly............................................................................................................................................................ 92
Chapter 5: System setup.............................................................................................................95
BIOS overview................................................................................................................................................................... 95
Entering BIOS setup program........................................................................................................................................ 95
Boot menu...........................................................................................................................................................................95
Navigation keys..................................................................................................................................................................96
One time boot menu.........................................................................................................................................................96
Boot Sequence...................................................................................................................................................................96
System setup options.......................................................................................................................................................97
General options............................................................................................................................................................ 97
System configuration................................................................................................................................................. 98
Video screen options................................................................................................................................................ 100
Security........................................................................................................................................................................ 100
Secure boot.................................................................................................................................................................102
Intel Software Guard Extensions options............................................................................................................ 103
Performance............................................................................................................................................................... 103
Power management.................................................................................................................................................. 104
Post behavior..............................................................................................................................................................105
Manageability..............................................................................................................................................................106
Virtualization support................................................................................................................................................106
Wireless options......................................................................................................................................................... 106
Maintenance................................................................................................................................................................107
System logs................................................................................................................................................................. 107
Updating the BIOS.......................................................................................................................................................... 108
Updating the BIOS in Windows.............................................................................................................................. 108
Updating the BIOS in Linux and Ubuntu.............................................................................................................. 108
Updating the BIOS using the USB drive in Windows........................................................................................ 108
Updating the BIOS from the F12 One-Time boot menu...................................................................................109
System and setup password.........................................................................................................................................109
4Contents
Assigning a system setup password...................................................................................................................... 110
Deleting or changing an existing system setup password................................................................................110
Clearing BIOS (System Setup) and System passwords.......................................................................................... 111
ExpressSign-in................................................................................................................................................................... 111
Chapter 6: Troubleshooting........................................................................................................ 115
Handling swollen Lithium-ion batteries....................................................................................................................... 115
Enhanced Pre-Boot System Assessment (ePSA) diagnostics.............................................................................. 116
Running the ePSA diagnostics................................................................................................................................ 116
Built-in self-test (BIST).................................................................................................................................................. 116
M-BIST.......................................................................................................................................................................... 116
LCD Power rail test (L-BIST).................................................................................................................................. 117
LCD Built-in Self Test (BIST)...................................................................................................................................117
System diagnostic lights................................................................................................................................................. 118
Recovering the operating system.................................................................................................................................118
Real-Time Clock (RTC Reset).......................................................................................................................................119
Backup media and recovery options............................................................................................................................119
WiFi power cycle.............................................................................................................................................................. 119
Drain residual flea power (perform hard reset)........................................................................................................ 119
Chapter 7: Getting help.............................................................................................................. 121
Contacting Dell..................................................................................................................................................................121
Contents 5
Working on your computer
Topics:
•Safety instructions
•Turning off your computer — Windows 10
•Before working inside your computer
•After working inside your computer
Safety instructions
Prerequisites
Use the following safety guidelines to protect your computer from potential damage and to ensure your personal safety. Unless
otherwise noted, each procedure included in this document assumes that the following conditions exist:
●You have read the safety information that shipped with your computer.
●A component can be replaced or, if purchased separately, installed by performing the removal procedure in reverse order.
About this task
NOTE: Disconnect all power sources before opening the computer cover or panels. After you finish working inside the
computer, replace all covers, panels, and screws before connecting to the power source.
WARNING: Before working inside your computer, read the safety information that shipped with your computer.
For additional safety best practices information, see the Regulatory Compliance Homepage
CAUTION: Many repairs may only be done by a certified service technician. You should only perform
troubleshooting and simple repairs as authorized in your product documentation, or as directed by the online or
telephone service and support team. Damage due to servicing that is not authorized by Dell is not covered by
your warranty. Read and follow the safety instructions that came with the product.
CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically
touching an unpainted metal surface at the same time as touching a connector on the back of the computer.
CAUTION: Handle components and cards with care. Do not touch the components or contacts on a card. Hold a
card by its edges or by its metal mounting bracket. Hold a component such as a processor by its edges, not by
its pins.
CAUTION: When you disconnect a cable, pull on its connector or on its pull-tab, not on the cable itself. Some
cables have connectors with locking tabs; if you are disconnecting this type of cable, press in on the locking
tabs before you disconnect the cable. As you pull connectors apart, keep them evenly aligned to avoid bending
any connector pins. Also, before you connect a cable, ensure that both connectors are correctly oriented and
aligned.
NOTE: The color of your computer and certain components may appear differently than shown in this document.
Turning off your computer — Windows 10
About this task
CAUTION: To avoid losing data, save and close all open files and exit all open programs before you turn off your
computer or remove the side cover.
1
6 Working on your computer
Steps
1. Click or tap .
2. Click or tap and then click or tap Shut down.
NOTE: Ensure that the computer and all attached devices are turned off. If your computer and attached devices did not
automatically turn off when you shut down your operating system, press and hold the power button for about 6 seconds
to turn them off.
Before working inside your computer
About this task
To avoid damaging your computer, perform the following steps before you begin working inside the computer.
Steps
1. Ensure that you follow the Safety Instruction.
2. Ensure that your work surface is flat and clean to prevent the computer cover from being scratched.
3. Turn off your computer.
4. Disconnect all network cables from the computer.
CAUTION: To disconnect a network cable, first unplug the cable from your computer and then unplug the
cable from the network device.
5. Disconnect your computer and all attached devices from their electrical outlets.
6. Press and hold the power button while the computer is unplugged to ground the system board.
NOTE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an
unpainted metal surface at the same time as touching a connector on the back of the computer.
After working inside your computer
About this task
After you complete any replacement procedure, ensure that you connect any external devices, cards, and cables before turning
on your computer.
Steps
1. Connect any telephone or network cables to your computer.
CAUTION: To connect a network cable, first plug the cable into the network device and then plug it into the
computer.
2. Connect your computer and all attached devices to their electrical outlets.
3. Turn on your computer.
4. If required, verify that the computer works correctly by running ePSA diagnostics.
Working on your computer 7
Technology and components
This chapter details the technology and components available in the system.
Topics:
•USB features
•USB Type-C
•HDMI 1.4a
•Corning Gorilla Glass
USB features
Universal Serial Bus, or USB, was introduced in 1996. It dramatically simplified the connection between host computers and
peripheral devices like mice, keyboards, external drivers, and printers.
Table 1. USB evolution
Type Data Transfer Rate Category Introduction Year
USB 2.0 480 Mbps High Speed 2000
USB 3.0/USB 3.1 Gen
1
5 Gbps SuperSpeed 2010
USB 3.1 Gen 2 10 Gbps SuperSpeed 2013
USB 3.0/USB 3.1 Gen 1 (SuperSpeed USB)
For years, the USB 2.0 has been firmly entrenched as the de facto interface standard in the PC world with about 6 billion
devices sold, and yet the need for more speed grows by ever faster computing hardware and ever greater bandwidth demands.
The USB 3.0/USB 3.1 Gen 1 finally has the answer to the consumers' demands with a theoretically 10 times faster than its
predecessor. In a nutshell, USB 3.1 Gen 1 features are as follows:
●Higher transfer rates (up to 5 Gbps)
●Increased maximum bus power and increased device current draw to better accommodate power-hungry devices
●New power management features
●Full-duplex data transfers and support for new transfer types
●Backward USB 2.0 compatibility
●New connectors and cable
The topics below cover some of the most commonly asked questions regarding USB 3.0/USB 3.1 Gen 1.
Speed
Currently, there are 3 speed modes defined by the latest USB 3.0/USB 3.1 Gen 1 specification. They are Super-Speed, Hi-Speed
and Full-Speed. The new SuperSpeed mode has a transfer rate of 4.8 Gbps. While the specification retains Hi-Speed, and
Full-Speed USB mode, commonly known as USB 2.0 and 1.1 respectively, the slower modes still operate at 480 Mbps and 12
Mbps respectively and are kept to maintain backward compatibility.
USB 3.0/USB 3.1 Gen 1 achieves the much higher performance by the technical changes below:
2
8 Technology and components
●An additional physical bus that is added in parallel with the existing USB 2.0 bus (refer to the picture below).
●USB 2.0 previously had four wires (power, ground, and a pair for differential data); USB 3.0/USB 3.1 Gen 1 adds four more
for two pairs of differential signals (receive and transmit) for a combined total of eight connections in the connectors and
cabling.
●USB 3.0/USB 3.1 Gen 1 utilizes the bidirectional data interface, rather than USB 2.0's half-duplex arrangement. This gives a
10-fold increase in theoretical bandwidth.
With today's ever increasing demands placed on data transfers with high-definition video content, terabyte storage devices,
high megapixel count digital cameras etc., USB 2.0 may not be fast enough. Furthermore, no USB 2.0 connection could ever
come close to the 480Mbps theoretical maximum throughput, making data transfer at around 320 Mbps (40 MB/s) — the
actual real-world maximum. Similarly, USB 3.0/USB 3.1 Gen 1 connections will never achieve 4.8Gbps. We will likely see a
real-world maximum rate of 400MB/s with overheads. At this speed, USB 3.0/USB 3.1 Gen 1 is a 10x improvement over USB
2.0.
Applications
USB 3.0/USB 3.1 Gen 1 opens up the laneways and provides more headroom for devices to deliver a better overall
experience. Where USB video was barely tolerable previously (both from a maximum resolution, latency, and video compression
perspective), it's easy to imagine that with 5-10 times the bandwidth available, USB video solutions should work that much
better. Single-link DVI requires almost 2Gbps throughput. Where 480Mbps was limiting, 5Gbps is more than promising. With its
promised 4.8Gbps speed, the standard will find its way into some products that previously weren't USB territory, like external
RAID storage systems.
Listed below are some of the available SuperSpeed USB 3.0/USB 3.1 Gen 1 products:
●External Desktop USB 3.0/USB 3.1 Gen 1 Hard Drives
●Portable USB 3.0/USB 3.1 Gen 1 Hard Drives
●USB 3.0/USB 3.1 Gen 1 Drive Docks & Adapters
●USB 3.0/USB 3.1 Gen 1 Flash Drives & Readers
●USB 3.0/USB 3.1 Gen 1 Solid-state Drives
●USB 3.0/USB 3.1 Gen 1 RAIDs
●Optical Media Drives
●Multimedia Devices
●Networking
●USB 3.0/USB 3.1 Gen 1 Adapter Cards & Hubs
Compatibility
The good news is that USB 3.0/USB 3.1 Gen 1 has been carefully planned from the start to peacefully co-exist with USB 2.0.
First of all, while USB 3.0/USB 3.1 Gen 1 specifies new physical connections and thus new cables to take advantage of the
higher speed capability of the new protocol, the connector itself remains the same rectangular shape with the four USB 2.0
contacts in the exact same location as before. Five new connections to carry receive and transmitted data independently are
present on USB 3.0/USB 3.1 Gen 1 cables and only come into contact when connected to a proper SuperSpeed USB connection.
Technology and components 9
USB Type-C
USB Type-C is a new, tiny physical connector. The connector itself can support various exciting new USB standards like USB 3.1
and USB power delivery (USB PD).
Alternate Mode
USB Type-C is a new connector standard that is very small. It is about a third the size of an old USB Type-A plug. This is
a single connector standard that every device should be able to use. USB Type-C ports can support a variety of different
protocols using “alternate modes,” which allows you to have adapters that can output HDMI, VGA, DisplayPort, or other types
of connections from that single USB port
USB Power Delivery
The USB PD specification is also closely intertwined with USB Type-C. Currently, smartphones, tablets, and other mobile
devices often use a USB connection to charge. A USB 2.0 connection provides up to 2.5 watts of power — that'll charge your
phone, but that's about it. A laptop might require up to 60 watts, for example. The USB Power Delivery specification ups this
power delivery to 100 watts. It's bi-directional, so a device can either send or receive power. And this power can be transferred
at the same time the device is transmitting data across the connection.
This could spell the end of all those proprietary laptop charging cables, with everything charging via a standard USB connection.
You could charge your laptop from one of those portable battery packs you charge your smartphones and other portable devices
from today. You could plug your laptop into an external display connected to a power cable, and that external display would
charge your laptop as you used it as an external display — all via the one little USB Type-C connection. To use this, the device
and the cable have to support USB Power Delivery. Just having a USB Type-C connection doesn't necessarily mean they do.
USB Type-C and USB 3.1
USB 3.1 is a new USB standard. USB 3's theoretical bandwidth is 5 Gbps, while USB 3.1's is 10 Gbps. That's double the
bandwidth, as fast as a first-generation Thunderbolt connector. USB Type-C isn't the same thing as USB 3.1. USB Type-C is just
a connector shape, and the underlying technology could just be USB 2 or USB 3.0. In fact, Nokia's N1 Android tablet uses a USB
Type-C connector, but underneath it's all USB 2.0 — not even USB 3.0. However, these technologies are closely related.
Thunderbolt over USB Type-C
Thunderbolt is a hardware interface that combines data, video, audio, and power in a single connection. Thunderbolt combines
PCI Express (PCIe) and DisplayPort (DP) into one serial signal, and additionally provides DC power, all in one cable. Thunderbolt
1 and Thunderbolt 2 use the same connector as miniDP (DisplayPort) to connect to peripherals, while Thunderbolt 3 uses a USB
Type-C connector.
Figure 1. Thunderbolt 1 and Thunderbolt 3
1. Thunderbolt 1 and Thunderbolt 2 (using a miniDP connector)
2. Thunderbolt 3 (using a USB Type-C connector)
10 Technology and components
Thunderbolt 3 over USB Type-C
Thunderbolt 3 brings Thunderbolt to USB Type-C at speeds up to 40 Gbps, creating one compact port that does it all -
delivering the fastest, most versatile connection to any dock, display or data device like an external hard drive. Thunderbolt 3
uses a USB Type-C connector/port to connect to supported peripherals.
1. Thunderbolt 3 uses USB Type-C connector and cables - It is compact and reversible
2. Thunderbolt 3 supports speed up to 40 Gbps
3. DisplayPort 1.4 – compatible with existing DisplayPort monitors, devices and cables
4. USB Power Delivery - Up to 130W on supported computers
Key Features of Thunderbolt 3 over USB Type-C
1. Thunderbolt, USB, DisplayPort and power on USB Type-C on a single cable (features vary between different products)
2. USB Type-C connector and cables which are compact and reversible
3. Supports Thunderbolt Networking (*varies between different products)
4. Supports up to 4K displays
5. Up to 40 Gbps
NOTE: Data transfer speed may vary between different devices.
Thunderbolt Icons
Figure 2. Thunderbolt Iconography Variations
HDMI 1.4a
This topic explains the HDMI 1.4a and its features along with the advantages.
HDMI (High-Definition Multimedia Interface) is an industry-supported, uncompressed, all-digital audio/video interface. HDMI
provides an interface between any compatible digital audio/video source, such as a DVD player, or A/V receiver and a
compatible digital audio and/or video monitor, such as a digital TV (DTV). The primary advantage is cable reduction and content
protection provisions. HDMI supports standard, enhanced, or high-definition video, plus multichannel digital audio on a single
cable.
HDMI 1.4a Features
●HDMI Ethernet Channel - Adds high-speed networking to an HDMI link, allowing users to take full advantage of their
IP-enabled devices without a separate Ethernet cable.
●Audio Return Channel - Allows an HDMI-connected TV with a built-in tuner to send audio data "upstream" to a surround
audio system, eliminating the need for a separate audio cable.
●3D - Defines input/output protocols for major 3D video formats, paving the way for true 3D gaming and 3D home theater
applications.
●Content Type - Real-time signaling of content types between display and source devices, enabling a TV to optimize picture
settings based on content type.
●Additional Color Spaces - Adds support for additional color models used in digital photography and computer graphics.
●4K Support - Enables video resolutions far beyond 1080p, supporting next-generation displays that will rival the Digital
Cinema systems used in many commercial movie theaters.
●HDMI Micro Connector - A new, smaller connector for phones and other portable devices, supporting video resolutions up
to 1080p.
Technology and components 11
●Automotive Connection System - New cables and connectors for automotive video systems, designed to meet the unique
demands of the motoring environment while delivering true HD quality.
Advantages of HDMI
●Quality HDMI transfers uncompressed digital audio and video for the highest, crispest image quality.
●Low-cost HDMI provides the quality and functionality of a digital interface while also supporting uncompressed video formats
in a simple, cost-effective manner.
●Audio HDMI supports multiple audio formats from standard stereo to multichannel surround sound.
●HDMI combines video and multichannel audio into a single cable, eliminating the cost, complexity, and confusion of multiple
cables currently used in A/V systems.
●HDMI supports communication between the video source (such as a DVD player) and the DTV, enabling new functionality.
Corning Gorilla Glass
Corning Gorilla Glass 5: Corning’s latest composition was formulated to address breakage the #1 consumer complaint, according
to Corning’s research. The new glass is just as thin and light as previous versions, but has been formulated to deliver
dramatically improved native damage resistance allowing improved in-field performance. Corning Gorilla Glass 5 has been tested
for performance when subjected to sharp contact damage, such as asphalt and other real-world surfaces.
Benefits
●Enhanced retained strength after use.
●High resistance to scratch and sharp contact damage.
●Improved drop performance.
●Superior surface quality.
Applications
●Ideal protective cover for electronic displays in:
○Smartphones
○Laptop and tablet computer screens
○Wearable devices
●Touchscreen devices
●Optical components
●High strength glass articles
Dimensions
Thickness: 0.4 mm
Viscosity
Table 2. Viscosity
Parameters Vectors
Softening Point (107.6 poises) 884˚C
Annealing Point (1013.2 poises) 623˚C
Strain Point (1014.7 poises) 571˚C
12 Technology and components
Properties
Table 3. Properties
Density 2.43 g/cm
Youngs Modulus 76.7 GPa
Poissons Ratio 0.21
Shear Modulus 31.7 GPa
Vickers Hardness (200 g load)
●Un-strengthened
●Strengthened
489 kgf/mm2
596 kgf/mm2
596 kgf/mm2
Fracture Toughness 0.69 MPa m0.5
Coefficient of Expansion (0 ˚C - 300 ˚C) 78.8 x 10-7 /°C
Chemical Strengthening
Capability of >850MPa CS, at 50 µm Depth Of Layer(DOL)
Specifications subject to change
Optical
Table 4. Optical
Refractive Index (590 nm)
Core glass** 1.50
Compression layer 1.51
Photo-elastic constant 30.3 nm/cm/MPa
** Core index is used for FSM-based measurements since it is unaffected by ion-exchange conditions.
Chemical Durability
Durability is measured via weight loss per surface area after immersion in the solvents shown below. Values are highly dependent
upon actual testing conditions. Data reported is for Corning Gorilla Glass 5.
Table 5. Chemical Durability
Reagent Time Temperature (ºC) Weight Loss (mg/cm2)
HCl - 5% 24 hrs 95 5.9
NH4F:HF - 10% 20 min 20 1.0
HF - 10% 20 min 20 25.2
NaOH - 5% 6 hrs 95 2.7
Technology and components 13
Electrical
Table 6. Electrical
Frequency (MHz) Dielectric Constant Loss Tangent
54 7.08 0.009
163 7.01 0.010
272 7.01 0.011
272 7.00 0.010
490 7.99 0.010
599 7.97 0.011
912 7.01 0.012
1499 6.99 0.012
1977 6.97 0.014
2466 6.96 0.014
2986 6.96 0.014
Terminated coaxial line similar to that outlined in NIST Technical Notes 1520 and 1355-R
Putting Corning Gorilla Glass 5 to the test.
●Greater damage resistance (upto 1.8X) with deep abrasion.
●Faster chemical strengthening with high Compressive Stress and deeper depth of compression
○Shallower check depth with higher abrasions levels
●Enables thickness reduction
14 Technology and components
Major components of your system
1. Base cover
2. Heatsink shield
3
Major components of your system 15
3. Touchscreen FPC cable
4. Heatsink
5. Fan
6. System board
7. Battery
8. Speakers
9. Palmrest assembly
10. Coin cell
11. WLAN card
12. WWAN card
13. WWAN shield
14. Solid state drive
15. SSD shield
NOTE: Dell provides a list of components and their part numbers for the original system configuration purchased. These
parts are available according to warranty coverages purchased by the customer. Contact your Dell sales representative for
purchase options.
16 Major components of your system
Removing and installing components
Topics:
•Recommended tools
•Screw List
•SD memory card
•SIM card tray
•Base cover
•Battery cable
•Coin cell
•Solid state drive
•WLAN card
•WWAN card
•Fan
•Speakers
•Heatsink
•Display assembly
•Battery
•System board
•Keyboard
•Palmrest assembly
Recommended tools
The procedures in this document require the following tools:
●Phillips #0 screwdriver
●Phillips #1 screwdriver
●Plastic scribe
●T-30 torx screwdriver
NOTE: The #0 screw driver is for screws 0-1 and the #1 screw driver is for screws 2-4.
Screw List
The following table shows the screw list and the images for Dell Latitude 7400 2-in-1, for different components and locations.
Table 7. Screw Size List
Component Screw type Quantity Image
Base cover Captive screws
NOTE: Screws are part of
the base cover
10
Solid State Drive M2x2 1
WLAN card M2x2 1
4
Removing and installing components 17
Table 7. Screw Size List (continued)
Component Screw type Quantity Image
WWAN card M2x2 1
Fan M2x2 1
Speakers M1.6x1.4 3
Heatsink M1.6x2.5 4
Display assembly M2.5x3.5 6
Battery ●M1.6x4.5
●M2x3
●1
●4●
●
System board ●M2x2
●M2x4
●M2x3
●2
●2
●5
●
●
●
Keyboard M1.6x1.5 ●1
●2
●40
SD memory card
Removing the SD memory card
Steps
1. Press the SD memory card to eject it from the SD memory card slot [1].
2. Remove the SD memory card from the computer [2].
18 Removing and installing components
Installing the SD memory card
Steps
Insert the SD memory card into its slot [1] until it clicks into place [2].
Removing and installing components 19
SIM card tray
Removing the SIM card tray
NOTE: This procedure applies for models that are shipped with WWAN card only.
Steps
1. Insert a paperclip or a SIM card removal tool into the pinhole on the SIM card tray [1].
2. Push the pin to disengage the lock and eject the SIM card tray [2].
3. Pull the SIM card tray out of the computer [3].
20 Removing and installing components
Installing the SIM card tray
Steps
Install the SIM card tray into its slot on the computer [1] and push to lock it in place [2].
Removing and installing components 21
2. Use a plastic scribe [1] to pry the base cover along the recess points located in the hinge indents as shown in the image.
3. Pry the base cover along the edges from the top side [2] to separate the base cover from the computer [2].
CAUTION: Do not pull on the base cover from the top side immediately after prying it open from the recesses
as it can damage the base cover.
Removing and installing components 23
4. Pry along the left, right and bottom edges of the base.
24 Removing and installing components
5. Slide the base cover outwards before removing it off the computer and then life the base cover off the computer.
Removing and installing components 25
Installing the base cover
Steps
1. Slide in base cover and place it on the computer.
26 Removing and installing components
2. Press along the edges of the base cover until it clicks into place.
Removing and installing components 27
3. Tighten the 10 captive screws to secure the base cover to the computer.
28 Removing and installing components
4. Press the two highlighted middle area of the system as shown in the image after the screws are secured to complete the
installation process.
Removing and installing components 29
Next steps
1. Install the SD memory card.
2. Follow the procedure in after working inside your computer.
Battery cable
Disconnecting the battery cable
Prerequisites
1. Follow the procedure in before working inside your computer.
2. Remove the SD memory card.
3. Remove the base cover.
Steps
Disconnect the battery cable from the connector on the system board.
30 Removing and installing components
Connecting the battery cable
Steps
Connect the battery cable to the connector on the system board.
Removing and installing components 31
Next steps
1. Install the base cover.
2. Install the SIM card.
3. Install the SD memory card.
4. Follow the procedure in after working inside your computer.
Coin cell
Removing the coin cell battery
Prerequisites
1. Follow the procedure in before working inside your computer.
2. Remove the SD memory card.
3. Remove the base cover.
4. Disconnect the battery cable.
Steps
1. Disconnect the coin-cell battery cable from the connector on the system board [1].
2. Peel and lift the coin-cell battery off the computer [2].
32 Removing and installing components
Installing the coin-cell battery
Steps
1. Affix the coin-cell battery to the system [1].
2. Connect the coin-cell battery cable to the connector on the system board [2].
Removing and installing components 33
Next steps
1. Connect the battery cable
2. Install the base cover.
3. Install the SD memory card.
4. Follow the procedure in after working inside your computer.
Solid state drive
Removing the solid state drive
Prerequisites
1. Follow the procedure in before working inside your computer.
2. Remove the SD memory card.
3. Remove the base cover.
4. Disconnect the battery cable.
Steps
1. Peel off the metal foil [1] and the black tape [2] that partially covers the solid state drive (SSD) cover.
34 Removing and installing components
2. Remove the single (M2x2) screw [1] that secures the SSD shield to the system board.
3. Lift to remove the SSD shield from the system board [2].
Removing and installing components 35
4. Slide and remove the SSD module from the connector on the system board.
Installing the solid state drive
Steps
1. Align and slide the solid state drive (SSD) module into the connector on the system board.
36 Removing and installing components
2. Place the SSD shield on the SSD module [1] and replace the single (M2x2) screw [2] to secure it to the system board.
3. Affix the black tape [1] and the metal foil [2] to secure the SSD shield in place.
Removing and installing components 37
Next steps
1. Connect the battery cable
2. Install the base cover.
3. Install the SD memory card.
4. 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. Remove the SD memory card.
3. Remove the base cover.
4. Disconnect the battery cable.
Steps
1. Partially peel off the Mylar sheet that covers the WLAN card [1].
2. Remove the single (M2x2) screw [2] that secures the WLAN card bracket to the WLAN card.
3. Remove the WLAN card bracket from the WLAN card.
4. Disconnect the wireless antennae cables [4] from the connectors on the WLAN card.
5. Slide and remove the WLAN card [5] from the connector on the system board.
38 Removing and installing components
Installing the WLAN card
Steps
1. Slide the WLAN card [1] at an angle into the WLAN card connector on the system board.
2. Connect the WLAN antenna card cables [2] to the connector on the WLAN card.
3. Align the screw hole on the WLAN card bracket with the screw hole on the WLAN card [3].
4. Replace the single (M2x2) [4] screw to secure the WLAN card to the system board.
5. Stick the Mylar sheet on the system board to cover the WLAN card [5].
Removing and installing components 39
Next steps
1. Connect the battery cable
2. Install the base cover.
3. Install the SD memory card.
4. Follow the procedure in after working inside your computer.
WWAN card
Removing the WWAN card
Prerequisites
1. Follow the procedure in before working inside your computer.
2. Remove the SD memory card.
3. Remove the base cover.
4. Disconnect the battery cable.
Steps
1. Remove the metal shield from the WWAN card.
40 Removing and installing components
2. Remove the single (M2x2) screw [1] that secures the WWAN bracket to the WWAN card.
3. Remove the WWAN bracket [2] from the WWAN card.
4. Disconnect the wireless antennae cables [3] from the connectors on the WWAN card.
5. Slide and remove the WWAN card [4] from the connector on the system board.
Removing and installing components 41
Installing the WWAN card
Steps
1. Slide the WWAN card [1] at an angle into the WWAN card connector on the system board.
2. Connect the WWAN antenna cables [2] to the connector on the WWAN card.
3. Align the screw hole on the WWAN card bracket with the screw hole on the WWAN card [3].
4. Replace the single (M2x2) screw [4] to secure the WWAN card to the system board.
42 Removing and installing components
5. Place the metal shield on the WWAN card.
Removing and installing components 43
Next steps
1. Connect the battery cable
2. Install the base cover.
3. Install the SD memory card.
4. Follow the procedure in after working inside your computer.
Fan
Removing the fan
Prerequisites
1. Follow the procedure in before working inside your computer.
2. Remove the SD memory card.
3. Remove the base cover.
4. Disconnect the battery cable.
NOTE: For the Latitude 7400 2-in-1 model shipped with a WWAN card, there is an L-shaped bracket (P-sensor bracket)
that covers the four WWAN LTE antenna cable connections to the system board. The screw that secures the bracket to
the system also helps secure the fan to the system. Technicians must first remove the bracket before removing the fan and
then reinstall the bracket after the fan is reinstalled.
Steps
1. Peel off the Mylar sheet from the system board.
44 Removing and installing components
2. Disconnect the fan cable [1] from the connector on the system board [1].
3. Partially peel off the metal foil [2] and the black tape [3] on the SSD shield.
Removing and installing components 45
4. Remove the single (M2x2) screw [1] that secures the WWAN P-sensor bracket to the system board.
5. Remove the WWAN P-sensor bracket [2] from the system board.
6. Partially peel off the padded gasket [1] from the fan case.
7. Remove the single (M2x2) screw [2] that secures the fan to the system board.
46 Removing and installing components
8. CAUTION: There are cushions, partially obstructing the palmrest, on the bottom side of the fan. Technicians
should not lift the fan directly up, as it may damage the fan.
Partially lift the left side of the fan and slide it to the left to remove it from the computer.
Removing and installing components 47
Installing the fan
About this task
For the Latitude 7400 2-in-1 model shipped with a WWAN card, there is an L-shaped bracket (P-sensor bracket) that covers the
four WWAN LTE antenna cable connections to the system board. The screw that secures the bracket to the system also helps
secure the fan to the system. Technicians must first remove the bracket before removing the fan and then reinstall the bracket
after the fan is reinstalled.
Steps
1. Slide the fan at an angle into its slot on the system board.
48 Removing and installing components
2. Replace the single (M2x2) screw [1] to secure the fan to the system board.
3. Adhere the padded rubber gasket [2] on the fan case.
Removing and installing components 49
4. Align the screw holes on the WWAN P-sensor bracket [1] with the screw hole on the fan.
5. Replace the single (M2x2) screw [2] to secure the WWAN P-sensor bracket to the fan.
6. Connect the fan cable [1] to the connector on the system board.
7. Adhere the black tape [2] and the metal foil [3] partially covering the SSD shield.
50 Removing and installing components
8. Adhere the Mylar sheet on the system board.
Removing and installing components 51
Next steps
1. Connect the battery cable
2. Install the base cover.
3. Install the SD memory card.
4. Follow the procedure in after working inside your computer.
Speakers
Removing the speakers
Prerequisites
1. Follow the procedure in before working inside your computer.
2. Remove the SD memory card.
3. Remove the base cover.
4. Disconnect the battery cable.
Steps
1. Disconnect the speaker cable [1] from the connector from the system board and peel off the speaker flex cable [2] from the
battery.
2. Remove the three (M1.6x1.4) screws [1] that secure the speakers to the system board and lift the speakers off the computer
[2].
52 Removing and installing components
Installing the speakers
Steps
1. Align the screw holes on the speakers [1] with the screw holes on the chassis
2. Replace the three (M1.6x1.4) screws [2] that secure the speakers to the chassis.
Removing and installing components 53
3. Connect the speaker cable [1] to the connector on the system board and adhere the speaker flex cable [2] on the battery.
54 Removing and installing components
Next steps
1. Connect the battery cable
2. Install the base cover.
3. Install the SD memory card.
4. Follow the procedure in after working inside your computer.
Heatsink
Removing the heatsink
Prerequisites
1. Follow the procedure in before working inside your computer.
2. Remove the SD memory card.
3. Remove the base cover.
4. Disconnect the battery cable.
Steps
1. Partially peel off the Mylar sheet [1] from the system board.
2. Disconnect the camera and touch screen FPC cable [2] from the connector on the system board.
3. Peel off the camera and touch screen FPC cable from the heatsink shield [3].
Removing and installing components 55
4. Remove the metal foil from the heatsink shield.
56 Removing and installing components
5. Remove the heatsink shield from the system board.
Removing and installing components 57
6. Remove the four (M1.6x2.5) screws [1] that secure the heatsink on the system board.
7. Lift the heatsink [2] off the system board.
58 Removing and installing components
Installing the heatsink
Steps
1. Align the screw holes on the heatsink [1] with the screw holes on the system board.
2. Replace the four (M1.6x2.5) screws [2] that secure the heatsink to the system board.
Removing and installing components 59
3. Place the heatsink shield on the heatsink.
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4. Adhere the metal foils on the heatsink shield.
Removing and installing components 61
5. Adhere the camera and touch screen FPC cables on the heatsink shield [1].
6. Connect the camera and touch screen FPC cables [2] to the connector on the system board.
7. Adhere the Mylar sheet [3] on the system board.
62 Removing and installing components
Next steps
1. Connect the battery cable
2. Install the base cover.
3. Install the SD memory card.
4. 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. Remove the SD memory card.
3. Remove the base cover.
4. Disconnect the battery cable.
Steps
1. Partially peel off the Mylar sheet [1] from the system board.
2. Disconnect the camera and touch screen FPC cable [2] from the connector on the system board.
3. Peel off the camera and touch screen FPC cable from the heatsink shield [3].
Removing and installing components 63
4. Peel off the tape on the display cable [1].
5. Pry the retention clips on both sides and flip open the latch [2].
CAUTION: The connector for the display cable features a latch that locks it in place on the system board
which technicians must flip open in order to disconnect the display cable from the system board. After
flipping open the latch, technicians must grasp the left and right sides of the cable's connector head and
disconnect the display cable from the system board in a direct upward motion to prevent damage to the
connector's pins.
6. Disconnect the display cable from the connector on the system board [3].
64 Removing and installing components
7. Remove the six (M2.5x3.5) screws [1] that secures the display hinges to the computer.
8. Lift the display assembly off the computer [2].
Removing and installing components 65
NOTE: The display assembly for the Latitude 7400 2-in-1 is a Hinge-Up Design (HUD) assembly and cannot be further
disassembled once it is removed from the bottom chassis. If any components of the HUD assembly are malfunctioning
and need to be replaced, replace the entire display assembly.
Installing the display assembly
Steps
1. Install the display assembly with hinges open at 180º aligned to the computer [1].
2. Replace the six (M2.5x3.5) screws [1] that secures the display hinges to the computer [2].
3. Connect the display cable [1] to the connector on the system board.
4. Close the latch [2] and adhere the tape on the display cable [3].
66 Removing and installing components
5. Route the camera and touch screen FPC and adhere it on the heatsink shield [1].
6. Connect the camera and touch screen FPC to the connector on the system board [2] and stick the Mylar sheet on the
system board [3].
Removing and installing components 67
Next steps
1. Connect the battery cable
2. Install the base cover.
3. Install the SD memory 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 as much as possible before removing it from the system. This can be done by
disconnecting the AC adapter from the system to allow the battery to drain.
●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.
●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.
68 Removing and installing components
●Always purchase genuine batteries from www.dell.com or authorized Dell partners and resellers.
Removing the battery
Prerequisites
1. Follow the procedure in before working inside your computer.
2. Remove the SD memory card.
3. Remove the base cover.
4. Disconnect the battery cable.
5. Remove the speakers.
Steps
1. Peel off the tape [1] and unroute the wireless antennae cables from the routing guides on the battery [2].
NOTE: The cables for the wireless antennas are routed over the plastic bracket at the top left corner and within the
routing channels along the left and bottom side of the battery. As a result, technicians must be careful when unrouting
the antenna cables from their routing guides while they are still attached to the wireless card. If there is difficulty in
unrouting the antenna cables from their routing channels, remove the WLAN card from the computer to create space to
unroute the cables.
2. Remove the single (M1.6x4.5) screw [1] in highlighted in red circle and four (M2x3) screws highlighted in yellow color that
secure the battery to the chassis.
3. Lift and remove the battery off the computer [2].
Removing and installing components 69
Figure 3. 4-cell battery
NOTE: A 6-cell battery has an extra M2x4 screw shown in green. Remove the screw before removing the battery from
the computer.
Table 8. Battery screw description
Size Amount
4-cell battery
Yellow M2x3L 5
Red M1.6x4.5L 1
6-cell battery Green M2x4L 1
70 Removing and installing components
Figure 4. 6-cell battery
Installing the battery
Steps
1. Align the screw holes on the battery with the screw holes on the palmrest assembly [1].
2. Replace the four (M2x3) screws and single (M1.6x4.5) screw that secure the battery to the palmrest assembly [2].
Removing and installing components 71
NOTE: Install the extra M2x4 screw for 6-cell battery. The screw is shown in green, in the battery disassembly section.
3. Stick the tape on wireless antennae cable securing it to the battery [1].
4. Thread the antennae cables along the routing channels and supporting bracket on the battery [2].
5. Connect the battery cable to the system board.
72 Removing and installing components
Next steps
1. Connect the battery cable
2. Install the base cover.
3. Install the SD memory card.
4. 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. Remove the SD memory card.
3. Remove the base cover.
4. Disconnect the battery cable.
5. Remove the coin cell.
6. Remove the SSD.
7. Remove the WLAN card.
8. Remove the WWAN card.
9. Remove the fan.
10. Remove the speakers.
11. Remove the heatsink.
12. Remove the battery.
Removing and installing components 73
Steps
1. Disconnect the coin cell cable from the system board [1] and remove the coin cell from the system board [2].
After removing all brackets and disconnecting all cables, there are five screws that secure the system board to the palmrest.
One of the screw is covered by the Real Time Clock (RTC) battery. Technicians must first peel the RTC battery off the
system board in order to access all the screws for the system board.
2. Peel off the tape on the display cable connector of the system board [3].
3. Pry the retention clips on both sides of the display cable connector, to flip open the latch [4].
4. CAUTION: The connector for the display cable features an actuator that locks it in place on the system
board. Flip open the latch to disconnect the display cable from the system board. Grasp the left and right
sides of the cable's connector head and disconnect the display cable from the system board in a direct
upward motion to prevent damage to the connector's pins.
Disconnect the display cable from the system board [5].
5. Disconnect the following power button cable from the system board [1].
6. Disconnect the USH board cable [2] and keyboard with backlight cable [3] from the system board.
7. Disconnect the touchpad cable [4] and LED board cable [5] from the system board.
74 Removing and installing components
8. Remove the single (M2x2) screw [1] securing the power fingerprint bracket to system board.
9. Remove the power fingerprint bracket [2] and disconnect the cable from the system board [3].
10. Disconnect the LTE P-sensor and isolator antenna cables [4] from the system board.
11. Disconnect the LTE MAIN and AUX antennae cables [5] from the system board.
Insert a plastic scribe into the slit at the bottom-left corner of the connector and then carefully pry up the cable connector
from the system board.
Removing and installing components 75
12. Remove the single (M2x2) screw [1] and remove the SSD bracket from the system board [2].
13. Remove the two (M2x4) screws [3] and remove the USB Type-C bracket [4] from the system board.
76 Removing and installing components
14. CAUTION: For models shipped with no LTE support, the dummy SIM card tray must first be removed from
the system before removing the system board.
Remove the five (M2x3) screws [1] and remove the system board from the computer [2].
NOTE: Lifting the system board from the thin middle portion might damage the board.
Removing and installing components 77
Installing the system board
Steps
1. Install the system board in the computer [1] and install the five (M2x3) screws securing it to the computer.
NOTE: After removing all brackets and disconnecting all cables, there are five screws that secure the system board to
the palmrest. One of the screw is covered by the Real Time Clock (RTC) battery. Technicians must first peel the RTC
battery off the system board in order to access all the screws for the system board.
78 Removing and installing components
2. Install the USB Type-C bracket [1] on the system board and secure it using two (M2x4) screws [2] on the system board.
3. Install the SSD bracket [3] and secure it using a single (M2x2) screw [4] to the system board.
Removing and installing components 79
4. Connect the Power button/fingerprint reader cable to the system board [1].
5. Install the power button/finger print reader bracket [2] on the system board and secure it using the single (M2x2) screw [3].
6. Connect the LTE P-sensor and isolator antenna cables [4] on the system board.
7. Connect the LTE MAIN and AUX antennae cables [5] on the system board.
80 Removing and installing components
8. Connect the following power button cable to the system board [1].
9. Connect the USH board cable [2] and keyboard with backlight cable [3] to the system board.
10. Connect the touchpad cable [4] and LED board cable [5] to the system board.
Removing and installing components 81
11. Install the coin cell [1] on the system board and connect its cable to the system board [2].
12. Connect the display cable to the system board [3] and flip close the actuator [4].
13. Secure the display cable connector by sticking the tape on the system board [5].
82 Removing and installing components
Next steps
1. Install the battery.
2. Install the heatsink
3. Install the speaker.
4. Install the fan.
5. Install the WWAN card.
6. Install the WLAN card.
7. Install the SSD.
8. Install the coin cell
9. Connect the battery cable
10. Install the base cover.
11. Install the SIM card
12. Install the SD memory card.
13. Follow the procedure after working inside your computer.
Keyboard
Removing the keyboard
Prerequisites
1. Follow the procedure in before working inside your computer.
2. Remove the SD memory card.
3. Remove the base cover.
Removing and installing components 83
4. Disconnect the battery cable.
5. Remove the coin cell.
6. Remove the SSD.
7. Remove the WLAN card.
8. Remove the WWAN card.
9. Remove the fan.
10. Remove the speakers.
11. Remove the battery.
12. Remove the heatsink.
13. Remove the system board.
Steps
1. Peel off the USH board cable [1], touchpad cable [2], and LED board cable [3] from the keyboard base.
2. Peel back the two pieces of LTE antenna module copper foil [1, 3] and LTE AUX cable from the keyboard [2].
3. Disconnect the smartcard reader FPC from the USH board [4] and peel off the FPC cable from the keyboard [5].
84 Removing and installing components
4. Remove the two (M1.6x1.5) screws [1] to remove the middle battery bracket [2] from the computer.
5. Peel off the keyboard and backlight FPC cables from the keyboard [3].
6. Remove the single (M1.6x1.5) screw [4] to remove the left battery bracket [5] from the computer.
Removing and installing components 85
7. Remove the 40 (M1.6x1.5) screws that secure the keyboard to the palmrest assembly. Several of the screws are covered
by the touchpad flexible flat cable, LED flexible flat cable (FFC), keyboard flexible printed circuit (FPC), and copper foil.
Technicians must peel back these FFC/FPC/foil in order to access the keyboard screws.
86 Removing and installing components
8. Lift the keyboard off the palmrest assembly.
Removing and installing components 87
Installing the keyboard
Steps
1. Place the keyboard on the palmrest assembly.
88 Removing and installing components
2. Replace the 40 (M1.6x1.5) screws on the keyboard to secure it to the palmrest assembly. Several of the screws are covered
by the touchpad flexible flat cable, LED flexible flat cable (FFC), keyboard flexible printed circuit (FPC), and copper foil.
Technicians must peel back these FFC/FPC/foil in order to access the keyboard screws.
Removing and installing components 89
3. Install the middle battery bracket [1] and secure it using two (M1.6x1.5) screws [2].
4. Stick the keyboard and backlight FPC cables to the keyboard [3].
5. Install left battery bracket [4] and secure it using single (M1.6x1.5) screw [5].
90 Removing and installing components
6. Stick the two pieces of LTE antenna module copper foil [1, 3] and LTE AUX cable on the keyboard [2].
7. Route and stick the smart card FPC cable [4] on the keyboard and connect it to the USH board [5].
Removing and installing components 91
8. Stick the USH board cable [1], touchpad cable [2], and LED board cable [3] on the keyboard base.
Next steps
1. Install the system board
2. Install the battery.
3. Install the heatsink
4. Install the speaker.
5. Install the fan.
6. Install the WWAN card.
7. Install the WLAN card.
8. Install the SSD.
9. Install the coin cell
10. Connect the battery cable
11. Install the base cover.
12. Install the SIM card
13. Install the SD memory card.
14. Follow the procedure after working inside your computer.
Palmrest assembly
Prerequisites
1. Follow the procedure in before working inside your computer.
2. Remove the SD memory card.
3. Remove the base cover.
4. Disconnect the battery cable.
5. Remove the coin cell.
6. Remove the SSD.
92 Removing and installing components
7. Remove the WLAN card.
8. Remove the WWAN card.
9. Remove the fan.
10. Remove the speakers.
11. Remove the heatsink.
12. Remove the display assembly.
13. Remove the battery.
14. Remove the system board.
15. Remove the keyboard.
Steps
1. After performing the preceding steps, you are left with palmrest assembly.
2. Transfer the post-requisite components onto the new palmrest assembly.
Next steps
Details of the Power button with FPC
1. WWAN antenna module with antenna cables and FPCs (for models shipped with a WWAN card)
2. SmartCard reader with FFC (for models shipped with a SmartCard reader)
3. LED board with FFC
4. Touchpad with FPC
5. Wireless antenna module with antenna cables
6. NFC module with FPC (for models shipped with an NFC reader)
7. USH daughter board with FPC (for models shipped with a USH daughter board)
8. Fingerprint reader module with FPC (for models shipped with a Fingerprint reader)
9. Power button with FPC
1. Install the keyboard
2. Install the system board
3. Install the battery.
4. Install the display assembly
Removing and installing components 93
5. Install the heatsink
6. Install the speaker.
7. Install the fan.
8. Install the WWAN card.
9. Install the WLAN card.
10. Install the SSD.
11. Install the coin cell
12. Connect the battery cable
13. Install the base cover.
14. Install the SIM card
15. Install the SD memory card.
16. Follow the procedure after working inside your computer.
94 Removing and installing components
System 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: 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
•Boot menu
•Navigation keys
•One time boot menu
•Boot Sequence
•System setup options
•Updating the BIOS
•System and setup password
•Clearing BIOS (System Setup) and System passwords
•ExpressSign-in
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.
Boot menu
Press <F12> when the Dell logo appears to initiate a one-time boot menu with a list of the valid boot devices for the system.
Diagnostics and BIOS Setup options are also included in this menu. The devices listed on the boot menu depend on the bootable
devices in the system. This menu is useful when you are attempting to boot to a particular device or to bring up the diagnostics
for the system. Using the boot menu does not make any changes to the boot order stored in the BIOS.
The options are:
5
System setup 95
●UEFI Boot:
○Windows Boot Manager
●
●Other Options:
○BIOS Setup
○BIOS Flash Update
○Diagnostics
○Change Boot Mode Settings
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.
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.
Boot Sequence
Boot Sequence allows you to bypass the System Setup–defined boot device order and boot directly to a specific device (for
example: optical drive or hard drive). During the Power-on Self Test (POST), when the Dell logo appears, you can:
●Access System Setup by pressing F2 key
●Bring up the one-time boot menu by pressing F12 key
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
96 System setup
NOTE: XXX denotes the SATA drive number.
●Optical Drive (if available)
●SATA Hard Drive (if available)
●Diagnostics
NOTE: Choosing Diagnostics, will display the ePSA diagnostics screen.
The boot sequence screen also displays the option to access the System Setup screen.
System setup options
NOTE: Depending on the laptop and its installed devices, the items listed in this section may or may not appear.
General options
Table 9. General
Option Description
System Information This section lists the primary hardware features of your
computer.
The options are:
●System Information
●Memory Configuration
●Processor Information
●Device Information
Battery Information Displays the battery status and the type of AC adapter
connected to the computer.
Boot Sequence Allows you to change the order in which the computer
attempts to find an operating system.
The options are:
●Windows Boot Manager
●Boot List Option:
Allows you to change the boot list options.
Click one of the following options:
○Legacy External Devices
○UEFI—Default
Advanced Boot Options Allows you to Enable Legacy Option ROMs.
The options are:
●Enable Legacy Option ROMs—Default
●Enable Attempt Legacy Boot
UEFI Boot Path Security Allows you to control whether the system prompts the user to
enter the Admin password when booting to a UEFI boot path.
Click one of the following options:
●Always, Except Internal HDD—Default
●Always
●Never
Date/Time Allows you to set the date and time. The change to the
system date and time takes effect immediately.
System setup 97
System configuration
Table 10. System Configuration
Option Description
SATA Operation Allows you to configure the operating mode of the integrated
SATA hard-drive controller.
Click one of the following options:
●Disabled
●AHCI
●RAID On—Default
NOTE: SATA is configured to support RAID mode.
Drives These fields let you enable or disable various drives on board.
The options are:
●SATA-2
●M.2 PCIe SSD-0
●M.2 PCIe SSD-1
SMART Reporting This field controls whether hard drive errors for integrated
drives are reported during startup.
The option is disabled by default.
USB Configuration Allows you to enable or disable the internal/integrated USB
configuration.
The options are:
●Enable USB Boot Support
●Enable External USB Ports
All the options are set by default.
NOTE: USB keyboard and mouse always work in the BIOS
setup irrespective of these settings.
Dell Type-C Dock Configuration Allows you to connect to Dell WD and TB family of
docks(Type-C Docks) independent of USB and thunderbolt
adapter configuration.
This option is enabled by default.
Thunderbolt™ Adapter Configuration Allows you to enable or disable Thunderbolt options:
●Thunderbolt (Enabled by Defualt)
●Enable Thunderbolt Boot Support
●Enable Thunderbolt (and PCIe behind TBT) Pre-boot
With following security levels :
●No Security
●User Authentication (Enabled by Defualt)
●Secure Connect
●Display Port and USB Only
Thunderbolt™ Auto Switch This option configures the method used by the Thunderbolt
controller to perform PCIe device enumeration.
●Auto Switch : The BIOS will automatically switch
between BIOS Assist and Native Thunderbolt PC device
enumeration modes to get all benefits of the installed OS
98 System setup
Table 10. System Configuration (continued)
Option Description
●Native Enumeration: The BIOS will program the
Thunderbolt controller to Native mode ( Auto Switching
is disabled)
●BIOS Assist Enumeration: The BIOS will program the
Thunderbolt controller to BIOS Assist mode ( Auto
Switching is disabled)
NOTE: A reboot is required for these changes to take
effect.
USB PowerShare This option enable/disable the USB PowerShare feature
behavior.
This option is disabled by default.
Audio Allows you to enable or disable the integrated audio controller.
By default, the Enable Audio option is selected.
The options are:
●Enable Microphone
●Enable Internal Speaker
This option is set by default.
Keyboard Illumination This field lets you choose the operating mode of the keyboard
illumination feature.
●Disabled: The Keyboard illumination will always be off or
0%.
●Dim: Enable the keyboard illumination feature at 50%
brightness.
●Bright: Enable the keyboard illumination feature at 100%
brightness level.
Keyboard Backlight Timeout on AC This feature defines the timeout value for the keyboard
backlight when an AC adapter is plugged into the system.
Options are:
●5 seconds
●10 seconds(Default)
●15 seconds
●30 seconds
●1 minute
●5 minute
●15 minute
●Never
Keyboard Backlight Timeout on Battery This feature defines the timeout value for the keyboard
backlight when the system is running only on battery power.
Options are:
●5 seconds
●10 seconds(Default)
●15 seconds
●30 seconds
●1 minute
●5 minute
●15 minute
●Never
System setup 99
Table 10. System Configuration (continued)
Option Description
Touchscreen This option controls whether the touchscreen is enabled or
disabled
This option is enabled by default.
Unobtrusive Mode When enabled, pressing Fn+F7 will turn off all light and
sound emission in the system. Press Fn+F7 to resume normal
operation.
Default is Disabled.
Fingerprint Reader Enable or disable the Fingerprint Reader or the Fingerprint
Reader Device's Single Sign On capability.
●Enable Fingerprint Reader Device: Enabled by Default
●ENable Fingerprint Reader Single Sign On: Enabled by
Default
Miscellaneous devices Allows you to enable or disable various on board devices.
●Enable Camera—Default
●Enable Secure Digital (SD) Card
●Secure Digital (SD) Card Boot - Disabled
●Secure Digital Card (SD) Read-Only Mode - Disabled
Video screen options
Table 11. Video
Option Description
LCD Brightness Allows you to set the display brightness depending upon the
power source. On Battery(50% is default) and On AC (100 %
default).
Dynamic Backlight Control This option Enables or Disables the Dynamic Backlight Control
if the Panel supports this feature.
Security
Table 12. Security
Option Description
Admin Password Allows you to set, change, or delete the administrator(admin) password.
The entries to set password are:
●Enter the old password:
●Enter the new password:
●Confirm new password:
Click OK once you set the password.
NOTE: For the first time login, "Enter the old password:" field is marked to "Not set". Hence,
password has to be set for the first time you login and then you can change or delete the
password.
System Password Allows you to set, change, or delete the System password.
The entries to set password are:
100 System setup
Table 12. Security (continued)
Option Description
●Enter the old password:
●Enter the new password:
●Confirm new password:
Click OK once you set the password.
NOTE: For the first time login, "Enter the old password:" field is marked to "Not set". Hence,
password has to be set for the first time you login and then you can change or delete the
password.
Strong Password Allows you to enforce the option to always set strong password.
●Enable Strong Password
This option is not set by default.
Password Configuration You can define the length of your password. Min = 4, Max = 32
Password Bypass Allows you to bypass the System password and the Internal HDD password, when it is set, during
a system restart.
Click one of the options:
●Disabled—Default
●Reboot bypass
Password Change Allows you to change the System password when the administrator password is set.
●Allow Non-Admin Password Changes
This option is set by default.
Non-Admin Setup
Changes
Allows you to determine whether changes to the setup options are allowed when an Administrator
Password is set. If disabled the setup options are locked by the admin password.
●Allow Wireless Switch Changes
This option is not set by default.
UEFI Capsule Firmware
Updates
Allows you to update the system BIOS via UEFI capsule update packages.
●Enable UEFI Capsule Firmware Updates
This option is set by default.
TPM 2.0 Security Allows you to enable or disable the Trusted Platform Module (TPM) during POST.
The options are:
●TPM On—Default
●Clear
●PPI Bypass for Enable Command—Default
●PPI Bypass for Disbale Command
●PPI Bypass for Clear Command
●Attestation Enable—Default
●Key Storage Enable—Default
●SHA-256—Default
Absolute® This field lets you Enable, Disable, or Permanently Disable the BIOS module interface of the
optional Absolute Persistence Module service from Absolute® Software.
OROM Keyboard Access This option determines whether users are able to enter Option ROM Configuration screens
via hotkey during boot. Specifically this settings is capable of preventing access to Intel®
RAID(Ctrl+I) or Intel® Management Engine BIOS Extension (Ctrl+P/F12).
Options are:
System setup 101
Table 12. Security (continued)
Option Description
●Enable
●One Time Enable
●Disable
Admin Setup Lockout Allows you to prevent users from entering Setup when an administrator password is set.
●Enable Admin Setup Lockout
This option is not set by default.
Master Password
Lockout
Allows you to disable master password support.
●Enable Master Password Lockout
This option is not set by default.
NOTE: Hard Disk password should be cleared before the settings can be changed.
SMM Security
Mitigation
Allows you to enable or disable additional UEFI SMM Security Mitigation protection.
●SMM Security Mitigation
This option is not set by default.
Secure boot
Table 13. Secure Boot
Option Description
Secure Boot Enable Allows you to enable or disable the Secure Boot Feature.
●Secure Boot Enable—Default
Secure Boot Mode Changes to the Secure Boot operation mode modifies the
behaviour of Secure Boot to allow evaluation of UEFI driver
signatures.
Choose one of the option:
●Deployed Mode—Default
●Audit Mode
Expert Key Management Allows you to enable or disable Expert Key Management.
●Enable Custom Mode
This option is not set by default.
The Custom Mode Key Management options are:
●PK—Default
●KEK
●db
●dbx
102 System setup
Intel Software Guard Extensions options
Table 14. Intel Software Guard Extensions
Option Description
Intel SGX Enable This field specifies you to provide a secured environment for
running code/storing sensitive information in the context of
the main OS.
Click one of the following options:
●Disabled
●Enabled
●Software controlled—Default
Enclave Memory Size This option sets SGX Enclave Reserve Memory Size
Click one of the following options:
●32 MB
●64 MB
●128 MB—Default
Performance
Table 15. Performance
Option Description
Multi Core Support This field specifies whether the process has one or all cores
enabled. The performance of some applications improves with
the additional cores.
●All—Default
●1
●2
●3
Intel SpeedStep Allows you to enable or disable the Intel SpeedStep mode of
processor.
●Enable Intel SpeedStep
This option is set by default.
C-States Control Allows you to enable or disable the additional processor sleep
states.
●C states
This option is set by default.
Intel® TurboBoost™ This option enables or disables the Intel® TurboBoost™ mode
of the processor
Hyper-Thread Control Allows you to enable or disable the HyperThreading in the
processor.
●Disabled
●Enabled—Default
System setup 103
Power management
Table 16. Power Management
Option Description
AC Behavior Allows you to enable or disable the computer from turning on automatically when an AC adapter
is connected.
●Wake on AC
This option is not set by default.
Enable Intel Speed Shift
technology
This option is used to enable/disable Intel Speed Shift Technology.
This option is not set by default.
Auto On Time Allows you to set the time at which the computer must turn on automatically.
The options are:
●Disabled—Default
●Every Day
●Weekdays
●Select Days
This option is not set by default.
USB Wake Support Allows you to enable USB devices to wake the system from standby.
●Enable USB Wake Support
●Wake on Dell USB-C Dock
This option is not set by default.
Wireless Radio Control This option if enabled, will sense the connection of the system to a wired network and
subsequently disable the selected wireless radios (WLAN and/or WWAN). Upon disconnection
from the wired network the selected wireless radio will ne enabled.
●Control WLAN radio
This option is not set by default.
Block Sleep This option lets you to block entering to sleep in OS environment.
This option is not set by default.
Peak Shift Allows you enable of disable the Peak shift feature. This feature when enabled minimizes the AC
power usage at times of peak demand. Battery doesnot charge between the Peak Shift start and
end time
Peak Shift Start and End Time can be configured for all weekdays
This option set the battery threshold value (15 % to 100 %)
Advanced Battery
Charge Configuration
This option enables you to maximize the battery health. By enabling this option, your system uses
the standard charging algorithm and other techniques, during the non-work hours to improve the
battery health.
Advanced Battery Charge Mode can be configured for all weekdays
Primary Battery Charge
Configuration
Allows you to select the charging mode for the battery.
The options are:
●Adaptive—Default
●Standard - Fully charges your battery at a standard rate.
●ExpressCharge- The battery charges over a shorter period of time using Dell’s fast charging
technology.
●Primarily AC use
104 System setup
Table 16. Power Management (continued)
Option Description
●Custom
If Custom Charge is selected, you can also configure Custom Charge Start and Custom Charge
Stop.
NOTE: All charging mode may not be available for all the batteries.
Post behavior
Table 17. POST Behavior
Option Description
Adapter Warnings Allows you to enable or disable the system setup (BIOS) warning messages when you use certain
power adapters.
●Enable Adapter Warnings—Default
Numlock Enable Allows you to enable or disable the Numlock function when the system boots.
●Enable Numlock—Default
Fn Lock Options Allows you to let hot key combinations Fn + Esc toggle the primary behavior of F1–F12, between
their standard and secondary functions. If you disable this option, you cannot toggle dynamically
the primary behavior of these keys.
●Fn Lock—Default
Click one of the following options:
●Lock Mode Disable/Standard
●Lock Mode Enable/Secondary—Default
Fastboot Allows you to speed up the boot process by bypassing some of the compatibility steps.
Click one of the following options:
●Minimal—Default
●Thorough
●Auto
Extended BIOS POST
Time
Allows you to create an additional preboot delay.
Click one of the following options:
●0 seconds—Default
●5 seconds
●10 seconds
Full Screen Logo Allows you to display full screen logo, if your image matches screen resolution.
●Enable Full Screen Logo
This option is not set by default.
Warnings and Errors Allows you to select different options to either stop, prompt and wait for user input, continue
when warnings are detected but pause on errors, or continue when either warnings or errors are
detected during the POST process.
Click one of the following options:
●Prompt on Warnings and Errors—Default
●Continue on Warnings
●Continue on Warnings and Errors
System setup 105
Table 17. POST Behavior (continued)
Option Description
Sign of Life Indicator This option allows system to indicate during the POST that the power button has been
acknowledged in a manner the user can either hear or feel.
●Enable Sign of Life Audio Indication
●Enable Sign of Life Display Indication
●Enable Sign of Life Keyboard Backlight Indication
Manageability
Table 18. Manageability
Option Description
USB Provision When enabled Intel AMT can be provisioned using the local
provisioning file via a USB storage device
MEBx Hotkey This option specifies whether the MEBx Hotkey function
should bee enabled when the system boots.
Virtualization support
Table 19. Virtualization Support
Option Description
Virtualization This option specifies whether a Virtual Machine Monitor (VMM) can utilize the additional
hardware capabilities provided by the Intel Virtualization technology.
●Enable Intel Virtualization Technology
This option is set by default.
VT for Direct I/O Enables or disables the Virtual Machine Monitor (VMM) from utilizing the additional hardware
capabilities provided by the Intel Virtualization technology for direct I/O.
●Enable VT for Direct I/O
This option is set by default.
Trusted Execution This option specifies whether a Measured Virtual Machine Monitor (MVMM) can utilize the
additional hardware capabilities provided by Intel® Trusted Execution Technology.
NOTE: The TPM has to be enabled and activated and Virtualization Technology and VT for
Direct I/O must be enabled to use this feature.
Wireless options
Table 20. Wireless
Option Description
Wireless Switch Allows to set the wireless devices that can be controlled by
the wireless switch.
The options are:
●WWAN
●GPS (on WWAN Module)
●WLAN
106 System setup
Table 20. Wireless (continued)
Option Description
●Bluetooth®
All the options are enabled by default.
Wireless Device Enable Allows you to enable or disable the internal wireless devices.
The options are:
●WWAN/GPS
●WLAN
●Bluetooth®
●Contactless Smartcard/ NFC
All the options are enabled by default.
Maintenance
Table 21. Maintenance
Option Description
Service Tag Displays the service tag of your computer.
Asset Tag Allows you to create a system asset tag if an asset tag is not already set.
This option is not set by default.
BIOS Downgrade Allows you to flash previous revisions of the system firmware.
●Allow BIOS Downgrade
This option is set by default.
Data Wipe Allows you to securely erase data from all internal storage devices.
●Wipe on Next Boot
This option is not set by default.
Bios Recovery BIOS Recovery from Hard Drive—This option is set by default. Allows you to recover the
corrupted BIOS from a recovery file on the HDD or an external USB key.
BIOS Auto-Recovery— Allows you to recover the BIOS automatically.
NOTE: BIOS Recovery from Hard Drive field should be enabled.
Always Perform Integrity Check—Performs integrity check on every boot.
System logs
Table 22. System Logs
Option Description
BIOS events Allows you to view and clear the System Setup (BIOS) POST events.
Thermal Events Allows you to view and clear the System Setup (Thermal) events.
Power Events Allows you to view and clear the System Setup (Power) events.
System setup 107
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
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.
108 System setup
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.
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 23. 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.
System setup 109
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:
●A password can have up to 32 characters.
●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.
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.
110 System setup
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.
ExpressSign-in
On Dell Latitude systems, the proximity sensor is accessed when the system is ON or in the sleep mode. The valid state of the
proximity sensor is Near, and Enable with external monitor. The proximity feature is automatically disabled while the laptop is
in the On state, and the remaining battery of the laptop is less than 30 minutes.
ExpressSign-in behavior in Near state
The following table explains the Near state behavior:
NOTE: The Dell ExpressSign-in user interface is the proximity sensor feature.
NOTE: In the ExpressSign-in window, click Go next to the Setup facial recognition field to start and setup the
Windows Hello facial sign-in option.
Table 24. Near state behavior
System state Description
ON/Standby Wakes up the system when the user is within the sensor Field
of View (FoV) of the system during the ON state and the LED
illuminates solid white light or in the standby state.
NOTE: Sensor does not wake the system from the low
power states which is battery life less than 30 minutes.
NOTE: Sensor does not support wake the system from
hibernation and power off state.
Off Does not wake the system from any of the power states even
when the user is within the sensor Field of View (FoV).
ExpressSign-in with the external monitor usage state
You can select ExpressSign-in enabled while connected to external monitor(s) to Yes to keep the ExpressSign-in function
still working even when the external monitor is connected. Select No to temporarily disable the ExpressSign-in functionality with
the external monitor connected. The following table explains the External monitor usage state behavior:
Table 25. External monitor usage state behavior
System state Description
Yes If the system is connected to an external monitor, the
proximity sensor checks whether the user is within the sensor
FoV.
No This is the default state and the system state remains
unchanged even when the user is outside of sensor FoV.
System setup 111
ExpressSign-in user interface in external monitor usage state
When one or more external monitor(s) are connected to the system and Near or Away state is enabled, the Dell ExpressSign-
inwindow is displayed on the primary monitor, and you can select Yes or No to enable or disable the proximity sensor.
If you select Yes, the proximity sensor is enabled. If you select No, the proximity sensor is not enabled. if you select the Do
not show again checkbox, a message that the user must be within the sensor FoV for the features to function properly is not
displayed until the option is again enabled manually.
NOTE: If multiple monitors are connected, the Dell ExpressSign-in window is displayed only for the first external monitor
that is connected to the system and not for the subsequent monitors.
Launch Dell ExpressSign-in/Systray icon
The Dell ExpressSign-in application supports the auto-run feature only when the application stays in the system tray. Once you
exit the Dell Proximity Sensor application, you have to re-launch the application and enable the feature manually. You can enable
the Systray icon to start the Dell ExpressSign-in window from the system desktop after Dell Proximity Sensor has been
launched.
To start the Dell ExpressSign-in , do the following:
1. Click Windows Settings > System > Power & Sleep > Dell Proximity Sensor > Change PC behavior based on your
proximity to the PC to start the Dell ExpressSign-in window.
NOTE: You can start the Dell Proximity Sensor window when the system is ON or in the sleep mode.
2. Click Change PC Behavior based on your proximity to the PC that is displayed at the bottom of the Settings screen.
3. You can also double-click Systray to start the Dell ExpressSign-in window.
4. Right-click Systray to view the context menu.
The options in the context menu are:
Table 26. Context menu options
System state Options
Near and Away ●Select Away to enable the system lock and turn off the
display when you move away from the system.
●Deselect Near to disable the system lock when you
move away from the system.
Enable with external monitor(s) ●Select Enable with external monitor(s) to enable the
ExpressSign-in.
●Deselect Enable with external monitor(s) to disable
the ExpressSign-in.
Open application Select to start the ExpressSign-in desktop application.
Quit Closes the ExpressSign-in desktop application and deletes
the Systray icon from the system. Restart the ExpressSign-
in from the operating system settings page or use the
Search option to view and start the ExpressSign-in.
Dell ExpressSign-in Field of View (FoV) states
The Field of View (FoV) defines the distance and the angle that the proximity sensor can detect while the proximity feature is
enabled. The FoV includes range angle and range distance. Dell recommends the distance between you and the laptop display
should be 70cm for optimum performance of the proximity sensor.
Table 27. FoV states
Field name Description
Range angle The proximity sensor should function satisfactorily in
detecting user presence / absence within a27° conical range
as defined by the center of the target.
112 System setup
Table 27. FoV states (continued)
Field name Description
Range distance The proximity sensor should function satisfactorily in
detecting user presence / absence <100cm away
Lock timer
The lock timer is the approximate time for Dell Express Sign-in to identify that the user is no longer in front of the system or
within the FoV. This feature will recognize your physical absence and lock the system.
The lock timer values are 60 seconds (default), 90 seconds, and 120 seconds. If Away is set to OFF, the Lock timer option is
grayed out.
Supported hinge angles
The ExpressSign-in works as configured in a supported four hinge angles for a particular mode. The ExpressSign-in does not
change the existing state if you are within the sensor FoV for an unsupported hinge angle. Once the system is in the supported
hinge angle, the ExpressSign-in will start to change the state. The supported hinge angles are:
Table 28. Supported hinge angles
System with status Supported hinge angle Illustration
Clamshell 60˚ to 150˚
Stand 210˚ to 300˚
Tablet Not supported
System setup 113
Table 28. Supported hinge angles (continued)
System with status Supported hinge angle Illustration
Tent Not supported
114 System setup
Troubleshooting
Topics:
•Handling swollen Lithium-ion batteries
•Enhanced Pre-Boot System Assessment (ePSA) diagnostics
•Built-in self-test (BIST)
•System diagnostic lights
•Recovering the operating system
•Real-Time Clock (RTC Reset)
•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
Troubleshooting 115
Enhanced Pre-Boot System Assessment (ePSA)
diagnostics
About this task
The ePSA diagnostics (also known as system diagnostics) performs a complete check of your hardware. The ePSA 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.
Running the ePSA diagnostics
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:
116 Troubleshooting
Table 29. 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.
Troubleshooting 117
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.
Table 30. LED codes
Diagnostic light codes Problem description
2,1 Processor failure
2,2 System board: BIOS or ROM (Read-Only Memory) failure
2,3 No memory or RAM (Random-Access Memory) detected
2,4 Memory or RAM (Random-Access Memory) failure
2,5 Invalid memory installed
2,6 System-board or chipset error
2,7 Display failure
2,8 LCD power rail failure. Replace system board
3,1 Coin-cell battery failure
3,2 PCI, video card/chip failure
3,3 Recovery image not found
3,4 Recovery image found but invalid
3,5 Power-rail failure
3,6 System BIOS Flash incomplete
3,7 Management Engine (ME) error
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.
118 Troubleshooting
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.
Real-Time Clock (RTC Reset)
The Real Time Clock (RTC) reset function allows you or the service technician to recover Dell Latitude systems from No
POST/No Power/No Boot situations. The legacy jumper enabled RTC reset has been retired on these models.
Start the RTC reset with the system powered off and connected to AC power. Press and hold the power button for thirty (30)
seconds. The system RTC Reset occurs after you release the power button.
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.
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)
Troubleshooting 119
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.
120 Troubleshooting
Getting help
Topics:
•Contacting Dell
Contacting Dell
Prerequisites
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.
About this task
Dell provides several online and telephone-based support and service options. Availability varies by country and product, and
some services may not be available in your area. To contact Dell for sales, technical support, or customer service issues:
Steps
1. Go to Dell.com/support.
2. Select your support category.
3. Verify your country or region in the Choose a Country/Region drop-down list at the bottom of the page.
4. Select the appropriate service or support link based on your need.
7
Getting help 121