Dell Latitude 7290 User Manual
Latitude 7290
Owner's Manual
Reg ula tor y M ode l: P28 S
Reg ula tor y T ype : P 28S 002
Oct obe r 2 020
Rev . A 02
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.
© 2018 - 2020 Dell Inc. or its subsidiaries. All rights reserved . D ell , E MC, and other trademarks are trademarks of Dell Inc. or its subsidi ari es.
Other trademarks may be trademarks of their respective owners.
Contents
Chapter 1: Working on your computer........................................................................................... 6
Safety precautions.............................................................................................................................................................. 6
Electrostatic discharge—ESD protection............................................................................................................... 6
ESD field service kit ..................................................................................................................................................... 7
Transporting sensitive components.......................................................................................................................... 8
Before working inside your computer.............................................................................................................................8
After working inside your computer................................................................................................................................8
Chapter 2: Removing and installing components........................................................................... 9
Recommended tools........................................................................................................................................................... 9
Screw size list.......................................................................................................................................................................9
Subscriber identification module card...........................................................................................................................10
Removing SIM card or SIM card tray......................................................................................................................10
Replacing SIM card.......................................................................................................................................................11
Removing dummy SIM card tray .............................................................................................................................. 11
Base cover........................................................................................................................................................................... 12
Removing base cover.................................................................................................................................................. 12
Installing base cover.................................................................................................................................................... 13
Battery.................................................................................................................................................................................. 13
Lithium-ion battery precautions................................................................................................................................13
Removing battery.........................................................................................................................................................14
Installing battery...........................................................................................................................................................15
Solid state drive..................................................................................................................................................................15
Removing Solid State Drive....................................................................................................................................... 15
Installing Solid State Drive......................................................................................................................................... 16
Speaker.................................................................................................................................................................................16
Removing speaker module......................................................................................................................................... 16
Installing speaker module........................................................................................................................................... 18
Coin cell battery................................................................................................................................................................. 18
Removing the coin cell battery................................................................................................................................. 18
Installing coin cell battery...........................................................................................................................................19
WWAN card.........................................................................................................................................................................19
Removing WWAN card............................................................................................................................................... 19
Installing WWAN card.................................................................................................................................................20
WLAN card...........................................................................................................................................................................21
Removing WLAN card.................................................................................................................................................21
Installing WLAN card................................................................................................................................................... 21
Memory modules............................................................................................................................................................... 22
Removing memory module........................................................................................................................................ 22
Installing memory module.......................................................................................................................................... 22
Heat sink..............................................................................................................................................................................23
Removing heat sink assembly................................................................................................................................... 23
Installing heat sink assembly..................................................................................................................................... 23
LED board............................................................................................................................................................................24
Contents 3
Removing LED board.................................................................................................................................................. 24
Installing LED board.................................................................................................................................................... 25
Touchpad buttons board................................................................................................................................................. 25
Removing touchpad buttons board.........................................................................................................................25
Installing touchpad buttons board........................................................................................................................... 27
Power connector port...................................................................................................................................................... 27
Removing power connector port............................................................................................................................. 27
Installing power connector port............................................................................................................................... 28
Display Assembly............................................................................................................................................................... 28
Removing display assembly.......................................................................................................................................28
Installing display assembly ........................................................................................................................................30
Touch display panel...........................................................................................................................................................30
Removing touch display panel.................................................................................................................................. 30
Installing touch display panel.................................................................................................................................... 32
Display Bezel.......................................................................................................................................................................32
Removing display bezel (nontouch)........................................................................................................................ 32
Installing display bezel (nontouch).......................................................................................................................... 33
Nontouch display panel....................................................................................................................................................34
Removing the display panel (nontouch)................................................................................................................ 34
Installing the display panel (nontouch).................................................................................................................. 36
Camera Microphone Module.......................................................................................................................................... 36
Removing camera-microphone module.................................................................................................................. 36
Installing camera.......................................................................................................................................................... 37
Display Hinge Caps............................................................................................................................................................38
Removing the display hinge cap...............................................................................................................................38
Installing the display hinge cap.................................................................................................................................38
System board..................................................................................................................................................................... 39
Removing system board............................................................................................................................................ 39
Installing system board...............................................................................................................................................42
Keyboard..............................................................................................................................................................................43
Removing keyboard assembly.................................................................................................................................. 43
Removing keyboard from keyboard tray................................................................................................................45
Installing keyboard to keyboard tray....................................................................................................................... 45
Installing keyboard assembly.....................................................................................................................................46
Palm rest............................................................................................................................................................................. 46
Replacing palm rest ................................................................................................................................................... 46
Chapter 3: Technology and components...................................................................................... 48
DDR4.................................................................................................................................................................................... 48
HDMI 1.4.............................................................................................................................................................................. 49
USB features......................................................................................................................................................................50
USB Type-C........................................................................................................................................................................52
Thunderbolt over USB Type-C...................................................................................................................................... 52
Chapter 4: System specifications................................................................................................ 54
Technical specifications................................................................................................................................................... 54
Hot key combinations.......................................................................................................................................................59
Chapter 5: System setup.............................................................................................................60
4
Contents
Boot menu...........................................................................................................................................................................60
Navigation keys.................................................................................................................................................................. 61
System setup options....................................................................................................................................................... 61
General screen options..................................................................................................................................................... 61
System Configuration screen options.......................................................................................................................... 62
Video screen options........................................................................................................................................................ 63
Security screen options................................................................................................................................................... 64
Secure Boot screen options........................................................................................................................................... 65
Intel software guard extensions screen options........................................................................................................66
Performance screen options.......................................................................................................................................... 66
Power management screen options............................................................................................................................. 67
POST behavior screen options...................................................................................................................................... 68
Manageability..................................................................................................................................................................... 69
Virtualization support screen options...........................................................................................................................69
Wireless screen options................................................................................................................................................... 69
Maintenance screen options...........................................................................................................................................70
System logs screen options............................................................................................................................................ 70
Admin and System password..........................................................................................................................................70
Assigning a system setup password........................................................................................................................ 71
Deleting or changing an existing system setup password.................................................................................. 71
Updating the BIOS in Windows ..................................................................................................................................... 71
Updating BIOS on systems with BitLocker enabled............................................................................................72
Updating your system BIOS using a USB flash drive..........................................................................................72
Updating the Dell BIOS in Linux and Ubuntu environments..............................................................................73
Chapter 6: Software.................................................................................................................... 74
Supported operating systems.........................................................................................................................................74
Downloading Windows drivers....................................................................................................................................... 74
Chipset driver..................................................................................................................................................................... 74
Video driver.........................................................................................................................................................................76
Audio driver.........................................................................................................................................................................76
Network driver................................................................................................................................................................... 77
USB driver........................................................................................................................................................................... 77
Storage driver..................................................................................................................................................................... 77
Other drivers.......................................................................................................................................................................77
Chapter 7: Troubleshooting......................................................................................................... 79
Dell Enhanced Pre-Boot System Assessment — ePSA Diagnostic 3.0............................................................... 79
Real Time Clock reset.......................................................................................................................................................79
Chapter 8: Contacting Dell.......................................................................................................... 80
Contents
5
Working on your computer
Topics:
• Safety precautions
• Before working inside your computer
• After working inside your computer
Safety precautions
The safety precautions chapter details the primary steps to be taken before performing any disassembly instructions.
Observe the following safety precautions before you perform any installation or break/fix procedures involving disassembly or
reassembly:
● Turn off the system and all attached peripherals.
● Disconnect the system and all attached peripherals from AC power.
● Disconnect all network cables, telephone, and telecommunications lines from the system.
● Use an ESD field service kit when working inside any notebook to avoid electrostatic discharge (ESD) damage.
● After removing any system component, carefully place the removed component on an anti-static mat.
● Wear shoes with non-conductive rubber soles to reduce the chance of getting electrocuted.
1
Standby power
Dell products with standby power must be unplugged before you open the case. Systems that incorporate standby power are
essentially powered while turned off. The internal power enables the system to be remotely turned on (wake on LAN) and
suspended into a sleep mode and has other advanced power management features.
Unplugging, pressing and holding the power button for 15 seconds should discharge residual power in the system board. Remove
the battery from notebooks.
Bonding
Bonding is a method for connecting two or more grounding conductors to the same electrical potential. This is done through the
use of a field service electrostatic discharge (ESD) kit. When connecting a bonding wire, ensure that it is connected to bare
metal and never to a painted or non-metal surface. The wrist strap should be secure and in full contact with your skin, and
ensure that you remove all jewelry such as watches, bracelets, or rings prior to bonding yourself and the equipment.
Electrostatic discharge—ESD protection
ESD is a major concern when you handle electronic components, especially sensitive components such as expansion cards,
processors, memory DIMMs, and system boards. Very slight charges can damage circuits in ways that may not be obvious, such
as intermittent problems or a shortened product life span. As the industry pushes for lower power requirements and increased
density, ESD protection is an increasing concern.
Due to the increased density of semiconductors used in recent Dell products, the sensitivity to static damage is now higher than
in previous Dell products. For this reason, some previously approved methods of handling parts are no longer applicable.
Two recognized types of ESD damage are catastrophic and intermittent failures.
● Catastrophic – Catastrophic failures represent approximately 20 percent of ESD-related failures. The damage causes an
immediate and complete loss of device functionality. An example of catastrophic failure is a memory DIMM that has received
a static shock and immediately generates a "No POST/No Video" symptom with a beep code emitted for missing or
nonfunctional memory.
6 Working on your computer
● Intermittent – Intermittent failures represent approximately 80 percent of ESD-related failures. The high rate of
intermittent failures means that most of the time when damage occurs, it is not immediately recognizable. The DIMM
receives a static shock, but the tracing is merely weakened and does not immediately produce outward symptoms related to
the damage. The weakened trace may take weeks or months to melt, and in the meantime may cause degradation of memory
integrity, intermittent memory errors, etc.
The more difficult type of damage to recognize and troubleshoot is the intermittent (also called latent or "walking wounded")
failure.
Perform the following steps to prevent ESD damage:
● Use a wired ESD wrist strap that is properly grounded. The use of wireless anti-static straps is no longer allowed; they do
not provide adequate protection. Touching the chassis before handling parts does not ensure adequate ESD protection on
parts with increased sensitivity to ESD damage.
● Handle all static-sensitive components in a static-safe area. If possible, use anti-static floor pads and workbench pads.
● When unpacking a static-sensitive component from its shipping carton, do not remove the component from the anti-static
packing material until you are ready to install the component. Before unwrapping the anti-static packaging, ensure that you
discharge static electricity from your body.
● Before transporting a static-sensitive component, place it in an anti-static container or packaging.
ESD field service kit
The unmonitored Field Service kit is the most commonly used service kit. Each Field Service kit includes three main components:
anti-static mat, wrist strap, and bonding wire.
Components of an ESD field service kit
The components of an ESD field service kit are:
● Anti-Static Mat – The anti-static mat is dissipative and parts can be placed on it during service procedures. When using an
anti-static mat, your wrist strap should be snug and the bonding wire should be connected to the mat and to any bare metal
on the system being worked on. Once deployed properly, service parts can be removed from the ESD bag and placed directly
on the mat. ESD-sensitive items are safe in your hand, on the ESD mat, in the system, or inside a bag.
● Wrist Strap and Bonding Wire – The wrist strap and bonding wire can be either directly connected between your wrist
and bare metal on the hardware if the ESD mat is not required, or connected to the anti-static mat to protect hardware that
is temporarily placed on the mat. The physical connection of the wrist strap and bonding wire between your skin, the ESD
mat, and the hardware is known as bonding. Use only Field Service kits with a wrist strap, mat, and bonding wire. Never use
wireless wrist straps. Always be aware that the internal wires of a wrist strap are prone to damage from normal wear and
tear, and must be checked regularly with a wrist strap tester in order to avoid accidental ESD hardware damage. It is
recommended to test the wrist strap and bonding wire at least once per week.
● ESD Wrist Strap Tester – The wires inside of an ESD strap are prone to damage over time. When using an unmonitored
kit, it is a best practice to regularly test the strap prior to each service call, and at a minimum, test once per week. A wrist
strap tester is the best method for doing this test. If you do not have your own wrist strap tester, check with your regional
office to find out if they have one. To perform the test, plug the wrist-strap's bonding-wire into the tester while it is
strapped to your wrist and push the button to test. A green LED is lit if the test is successful; a red LED is lit and an alarm
sounds if the test fails.
● Insulator Elements – It is critical to keep ESD sensitive devices, such as plastic heat sink casings, away from internal parts
that are insulators and often highly charged.
● Working Environment – Before deploying the ESD Field Service kit, assess the situation at the customer location. For
example, deploying the kit for a server environment is different than for a desktop or portable environment. Servers are
typically installed in a rack within a data center; desktops or portables are typically placed on office desks or cubicles. Always
look for a large open flat work area that is free of clutter and large enough to deploy the ESD kit with additional space to
accommodate the type of system that is being repaired. The workspace should also be free of insulators that can cause an
ESD event. On the work area, insulators such as Styrofoam and other plastics should always be moved at least 12 inches or
30 centimeters away from sensitive parts before physically handling any hardware components
● ESD Packaging – All ESD-sensitive devices must be shipped and received in static-safe packaging. Metal, static-shielded
bags are preferred. However, you should always return the damaged part using the same ESD bag and packaging that the
new part arrived in. The ESD bag should be folded over and taped shut and all the same foam packing material should be
used in the original box that the new part arrived in. ESD-sensitive devices should be removed from packaging only at an
ESD-protected work surface, and parts should never be placed on top of the ESD bag because only the inside of the bag is
shielded. Always place parts in your hand, on the ESD mat, in the system, or inside an anti-static bag.
● Transporting Sensitive Components – When transporting ESD sensitive components such as replacement parts or parts
to be returned to Dell, it is critical to place these parts in anti-static bags for safe transport.
Working on your computer
7
ESD protection summary
It is recommended that all field service technicians use the traditional wired ESD grounding wrist strap and protective anti-static
mat at all times when servicing Dell products. In addition, it is critical that technicians keep sensitive parts separate from all
insulator parts while performing service and that they use anti-static bags for transporting sensitive components.
Transporting sensitive components
When transporting ESD sensitive components such as replacement parts or parts to be returned to Dell, it is critical to place
these parts in anti-static bags for safe transport.
Before working inside your computer
1. Ensure that your work surface is flat and clean to prevent the computer cover from being scratched.
2. Turn off your computer.
3. If the computer is connected to a docking device (docked), undock it.
4. Disconnect all network cables from the computer (if available).
CAUTION: If your computer has an RJ45 port, disconnect the network cable by first unplugging the cable
from your computer.
5. Disconnect your computer and all attached devices from their electrical outlets.
6. Open the display.
7. Press and hold the power button for few seconds, to ground the system board.
CAUTION:
performing Step # 8.
To guard against electrical shock unplug your computer from the electrical outlet before
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.
8. Remove any installed ExpressCards or Smart Cards from the appropriate slots.
After working inside your computer
After you complete any replacement procedure, ensure that you connect external devices, cards, and cables before turning on
your computer.
CAUTION:
not use batteries designed for other Dell computers.
1. Connect any external devices, such as a port replicator or media base, and replace any cards, such as an ExpressCard.
2. Connect any telephone or network cables to your computer.
CAUTION:
computer.
3. Connect your computer and all attached devices to their electrical outlets.
4. Turn on your computer.
To avoid damage to the computer, use only the battery designed for this particular Dell computer. Do
To connect a network cable, first plug the cable into the network device and then plug it into the
8
Working on your computer
Removing and installing components
Topics:
• Recommended tools
• Screw size list
• Subscriber identification module card
• Base cover
• Battery
• Solid state drive
• Speaker
• Coin cell battery
• WWAN card
• WLAN card
• Memory modules
• Heat sink
• LED board
• Touchpad buttons board
• Power connector port
• Display Assembly
• Touch display panel
• Display Bezel
• Nontouch display panel
• Camera Microphone Module
• Display Hinge Caps
• System board
• Keyboard
• Palm rest
2
Recommended tools
The procedures in this document require the following tools:
● Phillips #0 screwdriver
● Phillips #1 screwdriver
● Plastic scribe
NOTE: The #0 screw driver is for screws 0-1 and the #1 screw driver is for screws 2-4
Screw size list
Table 1. Latitude 7290 screw size list
Component M2.5 x 6.0 M2.0 x 5.0 M2.5 x 3.5 M2.0 x 3.0 M2.0 x 2.5 M2.0 x 2.0
Back cover 8 (captive
screws)
Battery—3-cell 1
Battery—4-cell 2
SSD module 1
Removing and installing components 9
Table 1. Latitude 7290 screw size list (continued)
Component M2.5 x 6.0 M2.0 x 5.0 M2.5 x 3.5 M2.0 x 3.0 M2.0 x 2.5 M2.0 x 2.0
Heat sink
module
System fan 2
Speaker 4
WWAN card 1
WLAN card 1
Power
connector port
EDP bracket 2
LED board 1
Smart card
reader cage
Display hinge 6
Keyboard
support plate
Keyboard 5
System board 8
Memory module
bracket
4
1
2
18
1
LCD Back cover 4 2
Touchpad
button
Fingerprint 1
USB Type C
bracket
SSD holder 1
2
2
Subscriber identification module card
Removing SIM card or SIM card tray
NOTE:
SIM card or SIM card tray removal is only available on systems that are shipped with WWAN module. Hence,
removing procedure is only applicable for systems that are shipped with WWAN module.
CAUTION: Removing the SIM card with the system is turned On, may cause data loss or damage to the card.
Ensure that your system is turned off or the network connections are disabled.
1. Insert a paperclip or a SIM card removal tool into the pinhole on the SIM card tray.
2. Use a scribe to pull the SIM card tray.
3. If a SIM card is available, remove the SIM card from the SIM card tray.
10
Removing and installing components
Replacing SIM card
1. Insert a paperclip or a SIM card removal tool into the pinhole on the SIM card tray.
2. Use a scribe to pull the SIM card tray
3. Place on the SIM card on the tray.
4. Insert the SIM card tray into the slot.
Removing dummy SIM card tray
For models shipped with a WWAN card, the SIM card tray must first be removed from the system before removing the system
board. To remove the SIM card tray from the system follow the steps outlined in the disassembly section.
NOTE:
For models shipped with a wireless card only, a dummy SIM card tray must first be removed from the system before
removing the system board. The following are the steps for removing the dummy SIM card tray:
1. Push the release latch located on the SIM card slot inwards.
2. Slide the dummy SIM card tray out of the system.
Removing and installing components
11
Base cover
Removing base cover
1. Follow the procedure in Before working inside your computer.
2. To release the base cover:
a. Loosen the eight (M2.5 x 6.0) captive screws that secure the base cover to the system [1].
NOTE: Exercise caution when loosening the screws. Angle the screw driver to match the head of the screws
(Bottom Two) to avoid a possible stripped screw head.
b. Use a plastic scribe to release the base cover from the edge [2].
3. Lift the base cover from the system.
12
Removing and installing components
Installing base cover
1. Align the base cover tabs to the slots on the edges of the system.
2. Press the edges of the cover until it clicks into place.
3. To secure the base cover to the system, tighten the eight (M2.5 x 6.0) captive screws .
NOTE:
Exercise caution when tightening the screws. Angle the screw driver to match the head of the screw to avoid a
possible stripped screw head.
4. Follow the procedure in After working inside your computer.
Battery
Lithium-ion battery precautions
CAUTION:
● Exercise caution when handling Lithium-ion batteries.
● Discharge the battery completely before removing it. Disconnect the AC power adapter from the system and
operate the computer solely on battery power—the battery is fully discharged when the computer no longer
turns on when the power button is pressed.
● Do not crush, drop, mutilate, or penetrate the battery with foreign objects.
● Do not expose the battery to high temperatures, or disassemble battery packs and cells.
● Do not apply pressure to the surface of the battery.
● Do not bend the battery.
● Do not use tools of any kind to pry on or against the battery.
Removing and installing components 13
● 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.
● Always purchase genuine batteries from www.dell.com or authorized Dell partners and resellers.
Removing battery
1. Follow the procedure in Before working inside your computer.
2. Remove the base cover.
3. To remove the battery:
a. Disconnect the battery cable from the connector on the system board [1].
NOTE: The Latitude 7290 features either a 3-cell or 4-cell battery, which needs to be removed before replacing the
customer replaceable unit (CRU) parts. Therefore, when performing any disassembly procedure, the battery
connection must be disconnected immediately after removing the bottom cover. This procedure is required to
disconnect all power sources from the system and to prevent the system from accidentally switching on and shorting
the components.
b. Remove the M2.0 x 5.0 screw that secures the battery to the computer [2].
NOTE:
A 3-cell battery has a single screw, and a 4-cell battery has two screws. Hence, the image displayed below is
a 3-cell battery.
c. Lift the battery from the system [3].
14
Removing and installing components
Installing battery
1. Route the battery cable through the routing clip and connect the battery cable to the connector on the system board.
NOTE: Route the battery cable, if the cable at the base of the battery is un routed.
2. Insert the lower edge of the battery into the slot on the chassis and then seat the battery.
3. Tighten the two (M2.0 x 5.0) screws to secure the battery to the system.
NOTE: A small battery (3-cell) has a single screw, a larger battery (4-cell) has two screws.
4. Install the base cover
5. Follow the procedure in After working inside your computer.
Solid state drive
Removing Solid State Drive
1. Follow the procedure in Before working inside your computer.
2. Remove the base cover.
3. Disconnect the battery cable from the connector on the system board.
4. To remove the Solid State Drive:
a. Loosen the two (M2.0 x 3.0) captive screws that secure the Solid State Drive bracket [1].
b. Remove the Solid State Drive bracket (optional) [2].
c. Remove the Solid State Drive from the system [3].
Removing and installing components
15
Installing Solid State Drive
1. Insert the Solid State Drive into the connector.
2. Install the Solid State Drive bracket over the Solid State Drive.
NOTE: When installing the Solid State Drive bracket, ensure that the tab on the bracket is held securely with the tab on
the palm rest.
3. Tighten the two (M2.0 x 3.0) screws to secure the Solid State Drive to the Solid State Drive bracket and in turn to the
Palmrest.
4. Connect the battery cable to the connector on the system board.
5. Install the base cover.
6. Follow the procedure in After working inside your computer.
Speaker
Removing speaker module
1. Follow the procedure in Before working inside your computer.
2. Remove the base cover.
3. Disconnect the battery cable from the connector on the system board.
4. To release the speaker module:
a. Disconnect the speaker cable from the connector on the system board [1].
NOTE:
Use a plastic scribe to release the cable from the connector. Do not pull the cable as it may result in
breakage
b. Un-route the speaker cable from the two routing clips on the side of touchpad buttons [2].
c. Remove the tape that secures the speaker cables to the touchpad board [3].
16
Removing and installing components
5. To remove the speaker module:
a. Remove the four (M2.0 x 3.0) screws that secure the speaker module to the system [1].
NOTE: Refer the speaker screw list.
Removing and installing components 17
b. Lift the speaker module from the computer [2].
Installing speaker module
1. Place the speaker module into the slots on the system.
2. Replace the four (M2.0 x 3.0) screws to secure the speaker to the system.
3. Route the speaker cable through the retention clips on the system.
NOTE: Speaker cables are routed below the securing latch on the palm-rest and tucked below the touchpad buttons
bracket using tape.
4. Connect the speaker cable to the connector on the system board.
5. Connect the battery cable to the connector on the system board.
6. Install the base cover.
7. Follow the procedure in After working inside your computer.
Coin cell battery
Removing the coin cell battery
1. Follow the procedure in Before working inside your computer.
2. Remove the following components:.
a. base cover
3. Disconnect the battery
4. To remove the coin cell battery:
a. Disconnect the coin cell battery cable from the connector on the system board [1].
NOTE: You must un-route the coin cell battery cable from the routing channel.
NOTE: When removing or replacing the RTC battery or system board for Latitude 7490, the RTC battery cable must
be routed in the routing channels and secured within the notch on the system board.
b. Lift the coin cell battery to release it from the adhesive [2].
18
Removing and installing components
NOTE: When removing or replacing the RTC battery or the system board for Latitude 7290, the RTC battery must be
placed and secured with its adhesive onto the fingerprint reader bracket.
Installing coin cell battery
1. Affix the coin cell battery on the slot inside the computer.
2. Route the coin cell battery cable through the routing channel before connecting the cable.
3. Connect the coin cell battery cable to the connector on the system board.
NOTE:
When removing or replacing the RTC battery or system board for Latitude 7490, the RTC battery cable must be
routed in the routing channels and secured within the notch on the system board.
4. Reconnect the battery
5. Install the following components:
a. base cover
6. Follow the procedure in After working inside your computer.
WWAN card
Removing WWAN card
1. Follow the procedure in Before working inside your computer.
2. Remove the base cover.
3. Disconnect the battery cable from the connector on the system board.
4. To remove the WWAN card:
Removing and installing components
19
a. Remove the M2.0 x 3.0 screw that secures the WWAN bracket to the WWAN card [1].
b. Lift the WWAN bracket that secures the WWAN card [2] .
c. Disconnect the WWAN cables from the connectors on the WWAN card [3] .
NOTE: There is an adhesive pad on the routing pad of the system board which secure the wireless and WWAN cards.
Removing the wireless or WWAN card requires a small amount of additional force to separate the card from the
adhesive pads
5. Remove the WWAN card:
Installing WWAN card
1. Insert the WWAN card into the connector on the system board.
2. Connect the WWAN cables to the connectors on the WWAN card.
3. Place the metal bracket and tighten the M2.0 x 3.0 screw to secure it to the computer.
4. Connect the battery cable to the connector on the system board.
5. Install the base cover.
6. Follow the procedure in After working inside your computer.
NOTE: The IMEI number can also be found on the WWAN card.
NOTE: When installing the wireless and WWAN antennae must be routed correctly into the routing pads/clips on the
system board. For models shipped with a wireless card only, the technicians must always ensure that protective sleeves
are used to isolate the antenna connectors before reassembling the system.
20 Removing and installing components
WLAN card
Removing WLAN card
1. Follow the procedure in Before working inside your computer.
2. Remove the base cover.
3. Disconnect the battery cable from the connector on the system board.
4. To remove the WLAN card:
a. Remove the M2.0 x 3.0 screw that secures the metal bracket to the WLAN card [1].
b. Lift the metal bracket [2].
c. Disconnect the WLAN cables from the connectors on the WLAN card [3].
NOTE: There is an adhesive pad on the routing pad of the system board which secure the wireless and WWAN
cards. Removing the wireless or WWAN card requires a small amount of additional force to separate the card from
the adhesive pads.
d. Remove the WLAN card from the system [4].
Installing WLAN card
1. Insert the WLAN card into the connector on the system board.
2. Connect the WLAN cables to the connectors on the WLAN card.
3. Place the metal bracket and tighten the M2.0 x 3.0 screw to secure it to the WLAN card.
Removing and installing components
21
NOTE: When installing the wireless and WWAN antennae must be routed correctly into the routing pads/clips on the
system board. For models shipped with a wireless card only, the technicians must always ensure that protective sleeves
are used to isolate the antenna connectors before reassembling the system.
4. Connect the battery cable to the connector on the system board.
5. Install the base cover.
6. Follow the procedure in After working inside your computer.
Memory modules
Removing memory module
1. Follow the procedure in Before working inside your computer.
2. Remove the base cover.
3. Disconnect the battery cable from the connector on the system board.
4. To remove the memory module:
a. Pull the clips securing the memory module until the module snaps-out [1].
b. Remove the memory module from the connector on the system board [2].
Installing memory module
1. Insert module in connector then press Module down onto clips unit it snaps in.
2. Connect the battery cable to the connector on the system board.
3. Install the base cover.
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Removing and installing components
4. Follow the procedures in After working inside your computer.
Heat sink
Removing heat sink assembly
Heat sink assembly comprises of heat sink and the system fan.
1. Follow the procedure in Before working inside your computer.
2. Remove the following:
a. base cover
b. battery
3. To remove the heat sink assembly:
NOTE: To identify the number of screws, see the screw list.
a. Remove the 2 (M2.0 x 5.0) screws that secure the system fan and the 4 (M2.0 x 3.0) that secures the heat sink
assembly to the system board [2].
NOTE: Remove the screws in the order of the callout numbers [1, 2, 3, 4] as indicated on the heat sink.
b. Lift and flip over the heat sink assembly from the system board.
c. Disconnect the fan cable from the system board [1].
d. Separate the heat sink assembly from the system.
Installing heat sink assembly
Heat sink assembly comprises of heat sink and the system fan.
1. Align the heat sink assembly with screw holders on the system board.
2. Connect the fan cable to the connector on the system board.
Removing and installing components
23
3. Replace the M2.0 x 3.0 screws to secure the heat sink assembly to the system board.
NOTE: Replace the screws in the order of the callout numbers [1, 2, 3, 4] as indicated on the heat sink.
4. Install the following:
a. battery
b. base cover
5. Follow the procedure in After working inside your computer.
LED board
Removing LED board
1. Follow the procedure in Before working inside your computer.
2. Remove the following:
a. base cover
b. battery
c. speaker
3. To remove the LED board:
a. Disconnect the LED cable from the LED board [1].
CAUTION:
to push the edges of the cable connector to release the LED cable.
Avoid pulling the cable as it would result in breaking the cable connector. Instead, use a scribe
b. Remove the M2.0 x 2.5 screw that secures the LED board to the system [2].
c. Lift the LED board from the system [3].
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Removing and installing components
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