Dell OptiPlex 7490 All-In-One User Manual

OptiPlex 7490 All-In-One
Service Manual
Regulatory Model: W26C
Regulatory Type: W26C003/W26C004
April 2021
Rev. A00

Dell OptiPlex 7490 All-In-One Specifications

General

Display Size	23.8 inches
Display	FHD (1920 x 1080) Anti-glare
RAM	Up to 64GB DDR4
Graphics	Integrated Intel UHD Graphics
Operating System	Windows 10 Pro
Ports	USB 3.2 Gen 1 Type-A, USB-C 3.2 Gen 2, HDMI, Ethernet, Audio out
Wireless	Wi-Fi 6 (802.11ax) and Bluetooth 5.1
Audio	Stereo speakers

Summary

Working inside your computer

Safety instructions

Guidelines to protect the computer and ensure personal safety during servicing.

Before working inside your computer

Steps to take before starting internal computer operations.

Before you begin

Initial steps to prepare the system before working inside it.

Electrostatic discharge—ESD protection

ESD field service kit

Components and use of the ESD Field Service kit.

Components of an ESD field service kit

Lists the components of the ESD field service kit.

Transporting sensitive components

Guidelines for safely transporting static-sensitive components.

After working inside your computer

Removing and installing components

Recommended tools

Tools required for component removal and installation procedures.

Screw list

Details of screws used for various components.

Major components of your computer

Identifies and lists the main internal and external components of the computer.

Stand

Removing the fixed stand

Step-by-step guide to remove the fixed stand from the computer.

Installing the fixed stand

Step-by-step guide to install the fixed stand onto the computer.

Removing the articulating stand

Step-by-step guide to remove the articulating stand.

Installing the articulating stand

Removing the height adjustable stand

Step-by-step guide to remove the height adjustable stand.

Installing the height adjustable stand

Step-by-step guide to install the height adjustable stand onto the computer.

Cable cover—optional

Removing the cable cover

Step-by-step guide to remove the optional cable cover.

Installing the cable cover

Step-by-step guide to install the optional cable cover.

Back cover

Removing the back cover

Step-by-step guide to remove the back cover of the computer.

Installing the back cover

Step-by-step guide to install the back cover onto the computer.

Hard drive

Removing the hard drive

Step-by-step guide to remove the computer's hard drive.

Installing the hard drive

Step-by-step guide to install the computer's hard drive.

Memory modules

Removing the memory modules

Step-by-step guide to remove memory modules from the computer.

Installing the memory modules

Step-by-step guide to install memory modules into the computer.

System-board shield

Removing the system-board shield

Step-by-step guide to remove the system-board shield.

Installing the system-board shield

Step-by-step guide to install the system-board shield onto the computer.

Solid-state drive

Removing the M.2 2230 solid-state drive

Step-by-step guide to remove the M.2 2230 solid-state drive.

Installing the M.2 2230 solid-state drive

Step-by-step guide to install the M.2 2230 solid-state drive.

Removing the M.2 2280 solid-state drive/Intel Optane memory module

Step-by-step guide to remove M.2 2280 SSD or Intel Optane memory.

Installing the M.2 2280 solid-state drive/Intel Optane memory module

Step-by-step guide to install M.2 2280 SSD or Intel Optane memory.

System fan

Removing the system fan

Step-by-step guide to remove the internal system fan.

Installing the system fan

Step-by-step guide to install the internal system fan.

Coin-cell battery

Removing the coin-cell battery

Step-by-step guide to remove the coin-cell battery.

Installing the coin-cell battery

Step-by-step guide to install the coin-cell battery.

Wireless card

Removing the wireless card

Step-by-step guide to remove the wireless network card.

Installing the wireless card

Step-by-step guide to install the wireless network card.

Camera assembly

Removing the camera assembly

Step-by-step guide to remove the computer's camera assembly.

Installing the camera assembly

Step-by-step guide to install the computer's camera assembly.

Bottom cover

Removing the bottom cover

Step-by-step guide to remove the bottom cover of the computer.

Installing the bottom cover

Step-by-step guide to install the bottom cover onto the computer.

Power-supply unit (PSU)

Removing the power-supply unit (PSU)

Step-by-step guide to remove the computer's power-supply unit.

Installing the power-supply unit (PSU)

Step-by-step guide to install the computer's power-supply unit.

Power-supply fan

Removing the PSU fan

Step-by-step guide to remove the power-supply fan.

Installing the PSU fan

Step-by-step guide to install the power-supply fan.

Heat sink

Removing the heat sink—UMA

Step-by-step guide to remove the UMA heat sink.

Installing the heat sink—UMA

Step-by-step guide to install the UMA heat sink.

Removing the heat sink—discrete

Step-by-step guide to remove the discrete heat sink.

Installing the heat sink—discrete

Step-by-step guide to install the discrete heat sink.

Processor

Removing the processor

Step-by-step guide to remove the computer's processor.

Installing the processor

Step-by-step guide to install the computer's processor.

Rear-I/O bracket

Removing the rear-I/O bracket

Step-by-step guide to remove the rear I/O bracket.

Installing the rear-I/O bracket

Step-by-step guide to install the rear I/O bracket.

System board

Removing the system board

Step-by-step guide to remove the computer's system board.

Installing the system board

Step-by-step guide to install the computer's system board.

Speakers

Removing the speakers

Step-by-step guide to remove the computer's speakers.

Installing the speakers

Step-by-step guide to install the computer's speakers.

Power-button board

Removing the power-button board

Step-by-step guide to remove the power-button board.

Installing the power-button board

Step-by-step guide to install the power-button board.

Microphones

Removing the microphones

Step-by-step guide to remove the computer's microphones.

Installing the microphones

Step-by-step guide to install the computer's microphones.

Side I/O-board

Removing the side I/O-board

Step-by-step guide to remove the side I/O board.

Installing the side I/O-board

Step-by-step guide to install the side I/O board.

Audio board

Removing the audio board

Step-by-step guide to remove the computer's audio board.

Installing the audio board

Step-by-step guide to install the computer's audio board.

Antenna modules

Removing the antenna modules

Step-by-step guide to remove the wireless antenna modules.

Installing the antenna modules

Step-by-step guide to install the wireless antenna modules.

Display panel

Removing the display panel

Step-by-step guide to remove the computer's display panel.

Installing the display panel

Step-by-step guide to install the computer's display panel.

Middle frame

Removing the middle frame

Step-by-step guide to remove the middle frame of the computer.

Installing the middle frame

Step-by-step guide to install the middle frame of the computer.

Drivers and downloads

System setup

System setup

Overview of the BIOS/System Setup program and its functions.

BIOS overview

Explanation of the BIOS and its role in system management.

Entering BIOS setup program

Instructions on how to access the BIOS setup utility.

Boot Sequence

How to manage the system's boot device order.

Navigation keys

Explanation of keyboard keys used for navigation within System Setup.

System setup options

Detailed list and description of various system setup options.

Updating the BIOS in Windows

Updating BIOS on systems with BitLocker enabled

Special considerations for updating BIOS with BitLocker enabled.

Updating your system BIOS using a USB flash drive

Instructions for updating BIOS using a bootable USB drive.

System and setup password

Assigning a system setup password

Procedure to set up system and BIOS passwords for security.

Deleting or changing an existing system setup password

How to modify or remove existing system and setup passwords.

Clearing CMOS settings

Procedure to clear CMOS settings, resetting BIOS to defaults.

Clearing BIOS (System Setup) and System passwords

How to clear BIOS or system passwords via Dell support.

Troubleshooting

Display built-in self test

Steps to run the display's built-in self-test for diagnostics.

SupportAssist diagnostics

Overview of the SupportAssist diagnostics tool for hardware checks.

Running the SupportAssist Pre-Boot System Performance Check

Detailed steps to run the SupportAssist pre-boot diagnostic check.

Diagnostics

Explains diagnostic LED behavior and problem descriptions.

Recovering the operating system

Information on using Dell SupportAssist OS Recovery for system recovery.

Flashing BIOS (USB key)

Procedure to flash BIOS using a bootable USB drive.

Flashing the BIOS

Steps for updating the system BIOS.

WiFi power cycle

Procedure to troubleshoot WiFi connectivity by power cycling devices.

Flea power release

Procedure to release residual power from the computer.

Getting help and contacting Dell

Self-help resources

List of resources for obtaining product information and support.