1 Working on your computer............................................................................................................................. 7
Turning o your — Windows............................................................................................................................................7
Before working inside your computer..............................................................................................................................7
After working inside your computer.................................................................................................................................8
2 Removing and installing components.............................................................................................................9
Micro Secure Digital (SD) Card.......................................................................................................................................10
Removing the Micro Secure Digital (SD) Card....................................................................................................... 10
Installing the Micro Secure Digital (SD) Card..........................................................................................................10
Removing the micro SIM card or the micro SIM card tray....................................................................................10
Installing the micro SIM card or micro SIM card tray.............................................................................................. 11
Base cover..........................................................................................................................................................................11
Removing the base cover...........................................................................................................................................11
Installing the base cover............................................................................................................................................ 12
Removing the battery................................................................................................................................................ 12
PCIe Solid State Drive (SSD).......................................................................................................................................... 13
Removing the NVMe SSD card................................................................................................................................ 13
Installing the NVMe SSD........................................................................................................................................... 14
Removing the WLAN card.........................................................................................................................................14
Installing the WLAN card...........................................................................................................................................15
Removing the WWAN card....................................................................................................................................... 16
Installing the WWAN card..........................................................................................................................................16
Power board...................................................................................................................................................................... 17
Removing the power board....................................................................................................................................... 17
Installing the power board......................................................................................................................................... 18
Removing the speaker module..................................................................................................................................18
Installing the speaker module................................................................................................................................... 20
LED Board.........................................................................................................................................................................20
Removing the LED board..........................................................................................................................................20
Installing the LED board.............................................................................................................................................21
Removing the smart card cage................................................................................................................................22
Installing the smart card cage.................................................................................................................................. 23
Removing the display assembly................................................................................................................................23
Installing the display assembly..................................................................................................................................26
System Board...................................................................................................................................................................28
Removing system board............................................................................................................................................ 28
Installing system board...............................................................................................................................................31
Removing the real time clock (RTC)....................................................................................................................... 32
Installing real time clock (RTC).................................................................................................................................32
Removing keyboard from the keyboard tray.......................................................................................................... 35
Installing keyboard to the keyboard tray................................................................................................................. 35
3 Technology and components........................................................................................................................38
USB features.................................................................................................................................................................... 38
USB 3.0/USB 3.1 Gen 1 (SuperSpeed USB)...........................................................................................................38
Advantages of HDMI..................................................................................................................................................41
4 System specications..................................................................................................................................42
System specications......................................................................................................................................................42
Video specications.........................................................................................................................................................43
Communication specications........................................................................................................................................44
Near eld communication (NFC) specications.......................................................................................................... 44
Ports and connector specications............................................................................................................................... 45
Camera specications..................................................................................................................................................... 45
IR camera specications................................................................................................................................................. 45
AC adapter specications...............................................................................................................................................46
5 System setup...............................................................................................................................................49
System setup options......................................................................................................................................................50
General screen options....................................................................................................................................................50
System Conguration screen options............................................................................................................................ 51
Power management screen options.............................................................................................................................. 55
POST behavior screen options.......................................................................................................................................56
Virtualization support screen options............................................................................................................................58
System logs...................................................................................................................................................................... 59
Updating the BIOS in Windows .................................................................................................................................... 59
System and setup password.......................................................................................................................................... 60
Assigning a system setup password........................................................................................................................ 60
Deleting or changing an existing system setup password....................................................................................60
Serial IO driver..................................................................................................................................................................64
Serial ATA drivers............................................................................................................................................................. 67
Enhanced Pre-Boot System Assessment — ePSA diagnostics................................................................................68
Contents
5
Running the ePSA Diagnostics.................................................................................................................................68
Real Time Clock reset......................................................................................................................................................69
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 the reverse order.
WARNING: Disconnect all power sources before opening the computer cover or panels. After you nish 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 at www.dell.com/regulatory_compliance
CAUTION: Many repairs may only be done by a certied 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.
1
CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an
unpainted metal surface that is grounded to ground yourself before you touch the computer to perform any disassembly tasks.
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 dierently than shown in this document.
Turning o your — Windows
CAUTION
Click or tap .
1
2 Click or tap and then click or tap Shut down.
: To avoid losing data, save and close all open les and exit all open programs before you turn o your computer .
: Ensure that the computer and all attached devices are turned o. If your computer and attached devices did not
NOTE
automatically turn o when you shut down your operating system, press and hold the power button for about 6 seconds to
turn them o.
Before working inside your computer
1 Ensure that your work surface is at and clean to prevent the computer cover from being scratched.
2 Turn o your computer.
3 If the computer is connected to a docking device (docked), undock it.
Working on your computer7
4 Disconnect all network cables from the computer (if available).
CAUTION: If your computer has an RJ45 port, disconnect the network cable by rst 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: To guard against electrical shock unplug your computer from the electrical outlet before performing Step # 8.
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: To avoid damage to the computer, use only the battery designed for this particular Dell computer. Do 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 connect a network cable, rst plug the cable into the network device and then plug it into the
8
Working on your computer
Removing and installing components
This section provides detailed information on how to remove or install the components from your computer.
Topics:
•Screw size list
•Recommended tools
•Micro Secure Digital (SD) Card
•Subscriber Identity Module (SIM) Card
•Base cover
•Battery
•PCIe Solid State Drive (SSD)
•WLAN card
•WWAN card
•Power board
•Speaker
•LED Board
•Smart Card Cage
•Display Assembly
•Heat Sink
•System Board
•Coin cell battery
•Keyboard
•Palmrest
2
Screw size list
Table 1. Latitude 7389 - Screw size list
ComponentM 2.5 x 2.5LM 2.5 x 4.0LM 2.0 x 3.0LM 2 x 2LM 2.0 x 2LM 2 x 1.7LM 2 x 4LM 2.5 x 5
Hinge
bracket
Power Board2
LED Board2
Smart Card2
K/B to K/B
plate
K/B plate13
Base cover8
System board6
Fan11
Thermal4
4
6
Removing and installing components9
Battery4
WLAN1
WWAN1
EDP Bracket2
USB Type C2
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
Micro Secure Digital (SD) Card
Removing the Micro Secure Digital (SD) Card
CAUTION
computer is turned o.
NOTE: Micro SIM card tray is available only for systems that are shipped with WWAN card.
1 Follow the procedure in Before working inside your computer.
2 Press in on the Micro SD card to release it from the computer.
3 Slide the Micro SD card out of the computer.
: Removing the Micro SIM card when the computer in on may cause data loss or damage the card. Ensure that the
Installing the Micro Secure Digital (SD) Card
1 Slide the Micro SD into the slot until it clicks into place.
2 Follow the procedures in After working inside your computer.
Subscriber Identity Module (SIM) Card
Removing the micro SIM card or the micro SIM card tray
CAUTION
NOTE: Micro SIM card tray is available only for systems that are shipped with WWAN card.
: Removing the micro SIM card when the computer is on may cause data loss or damage the card.
1 Insert a paperclip or a micro SIM card removal tool into the pinhole on the micro SIM card tray.
2 Use a scribe to pull the micro SIM card tray.
3 If a micro SIM card is available, remove the micro SIM card from the micro SIM card tray.
Removing and installing components
10
Installing the micro SIM card or micro SIM card tray
1 Place the SIM card in the SIM card tray.
2 Align and push the SIM tray back into the SIM tray slot.
NOTE: Micro SIM card tray is available only for systems that are shipped with WWAN card.
Follow the procedure in After working inside your computer
3
Base cover
Removing the base cover
1 Follow the procedure in Before working inside your computer.
2 Loosen the M2.5 x 5.0 captive screws that secure the base cover to the computer.
3 Use a plastic scribe to pry the base cover starting from the hinges at the top edge of the base cover and lift it from the computer.
: The recesses are located near the hinges at the rear side of the computer.
NOTE
Removing and installing components11
Installing the base cover
1 Align the base cover tabs to the slots on the edges of the computer.
2 Press the edges of the cover until it clicks into place.
3 Tighten the M2.5 x 5.0 captive screws to secure the base cover to the computer.
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.
•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 Lithium-ion
battery can be dangerous. In such an instance, the entire system should be replaced. Contact https://www.dell.com/support for
assistance and further instructions.
•Always purchase genuine batteries from https://www.dell.com or authorized Dell partners and re-sellers.
Removing the battery
1 Follow the procedure in Before working inside your computer.
2 Remove:
a MicroSD card
b SIM card
NOTE
: To remove both cards if equipped and no need to remove the blank ller.
c Base cover
3 To remove the battery:
a Lift the ribbon, disconnect and remove the battery cable from the connector on the system board [1].
CAUTION
b Remove the M2.0 x 4 L screws that secure the battery to the computer [2].
c Lift the battery from the computer [3].
: Ensure that the battery cable lifts up over the battery and not into the LED cable.
Removing and installing components
12
Installing battery
1 Insert the battery into the slot on the computer.
2 Connect the battery cable to the connector on the system board.
3 Replace the M 2 x 4L screws to secure the battery to the computer.
4 Install the:
a base cover
b SIM card
c Micro SD card
NOTE
: To install both cards if equipped .
5 Follow the procedure in After working inside your computer.
PCIe Solid State Drive (SSD)
Removing the NVMe SSD card
1 Follow the procedure in Before working inside your computer.
2 Remove:
a MicroSD card
b SIM card
NOTE
c base cover
d battery
NOTE
: To remove both cards if equipped and no need to remove the blank ller.
: Disconnect the battery cable from the system board and remove the battery.
Removing and installing components13
3 To remove the NVMe SSD card:
a Loosen the M2.0 x 3.0 screws that secure SSD thermal bracket [1].
b Lift the thermal bracket from the SSD card [2,3].
c Slide and remove the SSD card from the slot [4].
Installing the NVMe SSD
1 Insert the NVMe SSD card into the connector.
2 Install the thermal bracket over the SSD card.
3 Tighten the M2.0 x 3.0 screws to secure the SSD thermal bracket.
4 Install the:
a battery
b base cover
c MicroSD card
d SIM card
NOTE
: To install both cards if equipped .
5 Follow the procedure in After working inside your computer.
WLAN card
Removing the WLAN card
1 Follow the procedure in Before working inside your computer.
2 Remove:
a MicroSD card
b SIM card
Removing and installing components
14
NOTE: To remove both cards if equipped and no need to remove the blank ller.
c base cover
d battery
NOTE: Disconnect and remove the battery from the system board.
3 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].
d Remove the WLAN card [4].
Installing the 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 replace the M2.0 x 3.0 screw to secure WLAN card to the computer.
4 Install the:
a battery
b base cover
c SIM card
d MicroSD card
: To install both cards if equipped.
NOTE
5 Follow the procedure in After working inside your computer.
Removing and installing components
15
WWAN card
Removing the WWAN card
1 Follow the procedure in Before working inside your computer.
2 Remove:
a MicroSD card
b SIM card
NOTE: To remove both cards if equipped and no need to remove the blank ller.
c base cover
d battery
NOTE: Disconnect and remove the battery from the system board.
3 To remove the WWAN card:
a Remove the M2.0 x 3.0 screw that secures the metal bracket to the WWAN card .
b Lift the metal bracket that secures the WWAN card .
c Disconnect the WWAN cables from the connectors on the WWAN card
d Lift the WWAN card from the computer.
Installing the 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 replace the M2.0 x 3.0 screw to secure the WLAN card to the computer.
Removing and installing components
16
4 Install the:
a battery
b base cover
c SIM card
d MicroSD card
NOTE: To install both cards if equipped.
5 Follow the procedure in After working inside your computer.
NOTE: The IMEI number can also be found on the WWAN card.
Power board
Removing the power board
1 Follow the procedure in Before working inside your computer.
2 Remove:
a MicroSD card
b SIM card tray
NOTE: To remove both cards if equipped and no need to remove the blank ller.
c base cover
d battery
3 To remove the power board:
a Lift the coin cell battery axed to the computer [1].
b Disconnect the power cable from the power board [2].
c Remove the M2.0x3.0 screws to release the power board [3].
d Lift the power board from the computer [4].
Removing and installing components
17
Installing the power board
1 Insert the power board into the slot.
2 Replace the M2.0x3.0 screws to secure the power board to the computer.
3 Connect the power board cable to the connector on the system board.
4 Ax the coin cell battery in the slot on the computer.
5 Install the:
a battery
b base cover
c SIM card
d MicroSD card
NOTE: To install both cards if equipped.
6 Follow the procedure in After working inside your computer.
Speaker
Removing the speaker module
1 Follow the procedure in Before working inside your computer.
2 Remove:
a MicroSD card
b SIM card
NOTE
: To remove both cards if equipped and no need to remove the blank ller.
c base cover
d battery
e power board
3 To disconnect the cables:
a Disconnect the LED board cable and smart card reader cable [1].
b Fold back the LED board and smart card reader cable back to allow access to the speaker cable [2].
18
Removing and installing components
4 To release the speaker module:
a Disconnect the speaker cable from the connector on the system board [1].
b Un route the speaker cable from the retention clips and remove the tapes that secure the speaker cable [2].
5 To remove the speaker module:
a Un route the speaker cable by removing the tapes near the palm rest [1].
b Lift the speaker module from the computer.
Removing and installing components
19
NOTE: You can use a plastic scribe to lift the speaker module from the computer.
Installing the speaker module
1 Place the speaker module into the slots on the computer.
2 Route the speaker cable through the routing channel and secure it with the tapes.
3 Connect the speaker cable to the connector on the system board.
4 Connect the smart card reader cable and then the LED board cable to the connector on the palm rest.
5 Install the:
a power board
b battery
c base cover
d SIM card
e Micro SD
NOTE
: To install both cards if equipped.
6 Follow the procedure in After working inside your computer.
LED Board
Removing the LED board
1 Follow the procedure in Before working inside your computer.
2 Remove:
a MicroSD card
b SIM card
Removing and installing components
20
NOTE: To remove both cards if equipped and no need to remove the blank ller.
c base cover
d battery
3 To remove the LED board:
a Disconnect the LED board cable from the LED board [1].
b Remove the tape that secures the LED board to the touchpad panel [2].
c Remove the M2 x 3 screws that secure the LED board [3].
d Lift the LED board from the computer [4].
Installing the LED board
1 Install the LED board into the slot.
2 Replace the M2 x 3 screws to secure the LED board.
3 Ax the tape to secure the LED board.
4 Connect the LED board cable to the LED board.
5 Install the:
a battery
b base cover
c SIM card
d MicroSD card
: To install both cards if equipped.
NOTE
6 Follow the procedure in After working inside your computer.
Smart Card Cage
Removing and installing components
21
Removing the smart card cage
NOTE: Always remove the smart card from the smart card reader.
1 Follow the procedure in Before working inside your computer.
2 Remove:
a MicroSD card
b SIM card
NOTE: To remove both cards if equipped and no need to remove the blank ller.
c base cover
d battery
e SSD card
3 To disconnect the cables:
a Disconnect the LED board cable and smart card reader cable [1].
b Peel back the previously disconnected LED board & smart card reader cable [2].
c Peel the SSD thermal pad from the SSD slot [3].
NOTE: You may need to apply force to peel o the SSD thermal
pad.
4 To remove the smart card cage:
a Remove the M2.0 x 1.7 screws that secure the smart card cage to the computer [1].
b Slightly slide the reader back and lift the smart card cage from the computer [2].
Removing and installing components
22
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