Dell OptiPlex 5490 All-In-One Service Manual

Dell OptiPlex 5490 All-In-One Manual

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  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 1
    OptiPlex 5490 All-In-One Service Manual Regulatory Model: W26C Regulatory Type: W26C003 / W26C004 April 2021 Rev. A00
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 2
    of data and tells you how to avoid the problem. WARNING: A WARNING indicates a potential for property damage, personal injury, or death. © 2021 Dell Inc. or its subsidiaries. All rights reserved. Dell, EMC, and other trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 3
    Contents Chapter 1: Safety instructions...6 Before working inside your computer...6 Before you begin ...7 Safety precautions...7 Electrostatic discharge-ESD protection...7 ESD field service kit ...8 Transporting sensitive components...9 After working inside your computer...9 Chapter 2: Removing and
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    Wireless card...53 Removing the wireless card...53 Installing the wireless card...54 Camera assembly...57 Removing the camera assembly...57 Installing the camera assembly...58 Bottom cover...61 Removing the bottom cover...61 Installing the bottom cover...62 Power-supply unit...64 Removing the power-
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    settings...145 Clearing BIOS (System Setup) and System passwords 145 Chapter 5: Troubleshooting...146 SupportAssist diagnostics...146 Display built-in self test...146 Diagnostics...146 Recovering the cycle...149 Flea power release...149 Chapter 6: Getting help and contacting Dell 150 Contents 5
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    , not by its pins. CAUTION: You should only perform troubleshooting and repairs as authorized or directed by the Dell technical assistance team. Damage due to servicing that is not authorized by Dell is not covered by your warranty. See the safety instructions that shipped with the product or at www
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 7
    operating system for shut-down instructions. 3. Disconnect your computer and getting electrocuted. Standby power Dell products with standby power done through the use of a field service electrostatic discharge (ESD) kit. When obvious, such as intermittent problems or a shortened product life
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 8
    troubleshoot service kit The unmonitored Field Service kit is the most commonly used service kit. Each Field Service service service Field Service kits to each service call, one Service desktop or portable environment. Servers are typically installed in a rack within a data center; desktops new part arrived
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 9
    new service technicians use the traditional wired ESD grounding wrist strap and protective anti-static mat at all times when servicing Dell , and point your toes out. 2. Tighten stomach muscles. Abdominal muscles support your spine when you lift, offsetting the force of the load. 3. instructions 9
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 10
    2 Removing and installing components NOTE: The images in this document may differ from your computer depending on the configuration you ordered. Topics: • Recommended tools • Screw list • Stand • Cable cover-optional • Back cover • Hard drive • Memory modules • System-board shield • Solid-state
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 11
    are not left attached to such surface when replacing a component. NOTE: Screw color may vary with the configuration ordered. Table 1. OptiPlex 7490 All-in-One screw list Component Screw type Cable cover-optional M3x9 Quantity 1 Screw image System-board shield M3x5 5 Bottom cover M3x5
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    shield M2x2.5 M3x5 Side-I/O board Antenna modules Display panel M2.5x3.5 M2x2.5 M3x5 Middle frame Audio board M3x5 M3x5 Table 2. OptiPlex 5490 All-in-One screw list Component Screw type Cable cover-optional M3x9 System-board shield M3x5 Bottom cover M3x5 M.2 2230 solid-state drive
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    Table 2. OptiPlex 5490 All-in-One screw list Component Screw type Camera door M3x5 Heat sink-UMA Heat sink-Discrete Power-supply unit (PSU) Captive screws Captive screws M3x5 PSU fan
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 14
    Stand Removing the fixed stand Prerequisites 1. Follow the procedure in Before working inside your computer. CAUTION: When servicing the system, place it on an elevated, clean, and flat surface. Dell Technologies recommends removing the stand to avoid accidental damage to the system display during
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 15
    Steps 1. Press and slide the release button up. 2. Hold the button in the release position and lift the stand upward. 3. Slide the stand downward, to lift the stand off the back cover. Installing the fixed stand Prerequisites If you are replacing a component, remove the existing component before
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 16
    16 Removing and installing components
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    remove the Height Adjustable Stand with Optical Disk Drive. 1. Follow the procedure in Before working inside your computer. CAUTION: When servicing the system, place it on an elevated, clean, and flat surface. Dell recommends removing the stand to avoid accidental damage to the system display during
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 18
    Steps 1. Press and slide the release button up. 2. Hold the button in the release position, and lift the stand upward. 3. Slide the stand downward, to lift the stand off the back cover. Installing the height adjustable stand Prerequisites If you are replacing a component, remove the existing
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 19
    inside your computer. Cable cover-optional Removing the cable cover Prerequisites 1. Follow the procedure in Before working inside your computer. CAUTION: When servicing the system, place it on an elevated, clean, and flat surface. It is recommended to remove the stand to avoid accidental damage to
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 20
    20 Removing and installing components
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    Removing and installing components 21
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    Steps 1. Unroute the power cable from the slots on the cable cover. 2. Remove the screw (M3x9) that secures the cable cover to the bottom cover. 3. Remove the screw (M3x5) that secures the cable cover to the bottom cover. 4. Lift the cable cover from the bottom cover. Installing the cable cover
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    Removing and installing components 23
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    Steps 1. Route the power cable through the slots on the cable cover. 2. Align the screw hole on the cable cover with the screw hole on the bottom cover. 3. Replace the screw (M3x9) to secure the cable cover to the bottom cover. 24 Removing and installing components
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 25
    on an elevated, clean, and flat surface. It is recommended to remove the stand to avoid accidental damage to the system display during servicing. 2. Remove the stand. 3. Remove the cable cover (optional). About this task The following image provides a visual representation of the back cover removal
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    26 Removing and installing components
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    Steps 1. Press and hold the release tab on the back cover to release it from the latch on the system-board shield. 2. Slide the back cover up to release the tabs on the cover from the slots on the middle frame. 3. Lift the back cover and remove it from the system. Installing the back cover
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    28 Removing and installing components
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    Removing and installing components 29
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    Steps 1. Place the back cover on the middle frame and system-board shield and align the tabs on the back cover with the slots on the middle frame. 2. Slide the back cover to lock the release tab under the latch on the system-board shield. Next steps 1. Install the cable cover (optional). 30
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 31
    2. Install the stand. 3. Follow the procedure in After working inside your computer. Hard drive Removing the hard drive Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the cable cover (optional). 4. Remove the back cover. About this task
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 32
    Steps 1. Press down the tab securing the hard-drive assembly to the system-board shield. 2. Slide and lift the hard-drive assembly from the slot on the display-assembly base. 3. Pry the tabs on hard-drive bracket from its slots on the hard drive. 4. Remove the hard drive from the hard-drive bracket.
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    Removing and installing components 33
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    Steps 1. Align the tabs on the hard-drive bracket with the slots on the hard drive. 2. Flex the hard-drive bracket and replace the remaining tabs on the hard-drive bracket with the slots on the hard drive. 3. Place the hard-drive assembly into the slot and slide it to lock the hard-drive assembly on
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    Memory modules Removing the memory modules Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the cable cover (optional). 4. Remove the back cover. About this task The following image indicates the location of the memory modules and provides
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    Steps 1. Pry and remove the DIMM door from the system-board shield. 2. Using your fingertips, spread apart the securing clips on the memory-module slot until the memory module pops up. 3. Slide and remove the memory module from the memory-module slot. NOTE: Repeat step 2 and 3 if there are two
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 37
    Steps 1. Align the notch on the memory module with the tab on the memory-module slot. 2. Slide the memory module firmly into the slot at an angle and press the memory module down until it clicks into place. NOTE: If you do not hear the click, remove the memory module and reinstall it. NOTE: Repeat
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 38
    Next steps 1. Install the back cover. 2. Install the cable cover (optional). 3. Install the stand. 4. Follow the procedure in After working inside your computer. System-board shield Removing the system-board shield Prerequisites 1. Follow the procedure in Before working inside your computer. 2.
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 39
    Steps 1. Remove the five screws (M3x5) that secure the system-board shield to the display-assembly base. 2. Lift the system-board shield off the display-assembly base. Installing the system-board shield Prerequisites If you are replacing a component, remove the existing component before performing
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    40 Removing and installing components
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    Steps 1. Align the screw holes on the system-board shield with the screw holes on the display-assembly base. 2. Replace the five screws (M3x5) to secure the system-board shield to the display-assembly base. Next steps 1. Install the back cover. 2. Install the cable cover (optional). 3. Install the
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 42
    About this task The following image indicates the location of the M.2 2230 solid-state drive and provides a visual representation of the removal procedure. Steps 1. Remove the screw (M2x2.5) that secures the solid-state drive to the system board. 2. Slide and remove the solid-state drive from the
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 43
    Installing the M.2 2230 solid-state drive Prerequisites CAUTION: Solid-state drives are fragile. Exercise care when handling the solid-state drive. If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 44
    Steps 1. Align the notch on the solid-state drive with the tab on the M.2 card slot. 2. Slide the solid-state drive into the M.2 card slot on the system board. 3. Replace the screw (M2x2.5) to secure the solid-state drive to the system board. Next steps 1. Install the system-board shield. 2. Install
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 45
    Steps 1. Remove the screw (M2x2.5) that secures the solid-state drive to the system board. 2. Slide and remove the solid-state drive from the M.2 card slot on the system board. Installing the M.2 2280 solid-state drive/Intel Optane memory moduleInstalling the M.2 2280 solid-state drive Prerequisites
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    Steps 1. Align the notch on the solid-state drive with the tab on the M.2 card slot. 2. Slide the solid-state drive into the M.2 card slot on the system board. 3. Replace the screw (M2x2.5) to secure the solid-state drive to the system board. Next steps 1. Install the system-board shield. 2. Install
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 47
    5. Follow the procedure in After working inside your computer. System fan Removing the system fan Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the cable cover (optional). 4. Remove the back cover. 5. Remove the system-board shield.
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    Steps 1. Disconnect the system-fan cable from the system board. 2. Remove the three screws (M3x5) that secure the system fan to the display-assembly base. 3. Lift the system fan, along with its cable, off the display-assembly base. Installing the system fan Prerequisites If you are replacing a
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    Steps 1. Align the screw holes on the system fan with the screw holes on the display-assembly base. 2. Replace the three screws (M3x5) to secure the system fan to the display-assembly base. 3. Connect the system-fan cable to the connector on the system board. Next steps 1. Install the system-board
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    3. Install the cable cover (optional). 4. Install the stand. 5. Follow the procedure in After working inside your computer. Coin-cell battery Removing the coin-cell battery Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the cable cover (
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 51
    Steps 1. Using the plastic scribe, press on the metal clip to release the coin-cell battery from the coin-cell battery holder. 2. Lift the coin-cell battery from the coin-cell battery holder. Installing the coin-cell battery Prerequisites If you are replacing a component, remove the existing
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    Steps With the positive-side facing up, insert the coin-cell battery into the battery holder on the system board and gently press the battery until it snaps into place. Next steps 1. Install the system-board shield. 2. Install the back cover. 3. Install the cable cover (optional). 4. Install the
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 53
    Wireless card Removing the wireless card Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the cable cover (optional). 4. Remove the back cover. 5. Remove the system-board shield. About this task The following image indicates the location of
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 54
    Steps 1. Remove the two screws (M2x2.5) that secure the wireless-card shield to the system board. 2. Unroute the antenna cables from the routing guides on the wireless-card shield. 3. Lift the wireless-card shield out of the system. 4. Remove the screw (M2x2.5) that secures the wireless-card bracket
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    Removing and installing components 55
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    7. Replace the two screws (M2x2.5) to secure the wireless-card shield to the system board. 8. Route the antenna cables through the routing guides on the wireless-card shield. Next steps 1. Install the system-board shield. 2. Install the back cover. 3. Install the cable cover (optional). 4. Install
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 57
    5. Follow the procedure in After working inside your computer. Camera assembly Removing the camera assembly Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the cable cover (optional). 4. Remove the back cover. 5. Remove the system-board
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    door to the display-assembly base. 2. Disconnect the camera cable from the connector on the system board. 3. Unroute the camera cable from the routing guides on the display-assembly base. 4. Remove the two screws (M3x5) that secure the camera assembly to the middle frame. 5. Slide and remove the
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    Removing and installing components 59
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    the middle frame. 2. Replace the two screws (M3x5) to secure the camera assembly to the middle frame. 3. Route the camera cable through the routing guides on the display-assembly base. 4. Connect the camera cable to the system board. 5. Align the screw holes on the camera door with the screw holes
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    Bottom cover Removing the bottom cover Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the cable cover (optional). 4. Remove the back cover. 5. Remove the system-board shield. About this task The following image indicates the location of
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 62
    Steps 1. Remove the four screws (M3x5) that secure the bottom cover to the display-assembly base. 2. Pry and lift the bottom cover off the display-assembly base. Installing the bottom cover Prerequisites If you are replacing a component, remove the existing component before performing the
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    Removing and installing components 63
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    Steps 1. Align the screw holes on the bottom cover with the screw holes on the display-assembly base. 2. Replace the four screws (M3x5) to secure the bottom cover to the display-assembly base. Next steps 1. Install the system-board shield. 2. Install the back cover. 3. Install the cable cover (
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 65
    Removing and installing components 65
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    66 Removing and installing components
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    -supply socket to the rear-I/O bracket. 2. Slide the power-supply socket out of the rear-I/O bracket. 3. Remove the power-supply cable from the routing guides on the rear-I/O bracket and PSU fan. 4. Disconnect the power-supply cable from the connector on the system board. 5. Remove the screw (M3x5
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    68 Removing and installing components
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    Removing and installing components 69
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    to the display-assembly base. 3. Connect the power-supply cable to the connector on the system board. 4. Route the power-supply cable through the routing guides on the rear-I/O bracket and PSU fan. 5. Align the screw hole on the power-supply socket with the screw hole on the rear-I/O bracket, and
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 71
    5. Install the stand. 6. Follow the procedure in After working inside your computer. Power-supply fan Removing the PSU fan Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the cable cover (optional). 4. Remove the back cover. 5. Remove the
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    Steps 1. Remove the power-supply cable from the routing guides on the PSU fan. 2. Disconnect the PSU-fan cable from the system board. 3. Remove the two screws (M3x5) that secure the PSU fan to the
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    to the display-assembly base. 3. Connect the PSU-fan cable to the connector on the system board. 4. Route the power-supply cable through the routing guides on the PSU fan. Next steps 1. Install the bottom cover. Removing and installing components 73
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    2. Install the system-board shield. 3. Install the back cover. 4. Install the cable cover (optional). 5. Install the stand. 6. Follow the procedure in After working inside your computer. Heat sink Removing the heat sink-UMA Prerequisites 1. Follow the procedure in Before working inside your computer
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    Steps 1. In reverse sequential order (as indicated on the heat sink), loosen the five captive screws that secure the heat sink to the system board and the display-assembly base. 2. Slide and lift the heat sink off the system board and display-assembly base. Installing the heat sink-UMA Prerequisites
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    76 Removing and installing components
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    Steps 1. Align the screw holes on the heat sink with the screw holes on the system board and the display-assembly base. 2. In sequential order (as indicated on the heat sink), tighten the five captive screws that secure the heat sink to the system board and display-assembly base. Next steps 1.
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    About this task The following image indicates the location of the heat sink and provides a visual representation of the heat sink removal procedure. 78 Removing and installing components
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    Steps 1. In reverse sequential order (as indicated on the heat sink), loosen the nine captive screws that secure the heat sink to the system board and the display-assembly base. 2. Slide and lift the heat sink off the system board and display-assembly base. Installing the heat sink-discrete
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    80 Removing and installing components
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    Steps 1. Align the screw holes on the heat sink with the screw holes on the system board and the display-assembly base. 2. In sequential order (as indicated on the heat sink), tighten the nine captive screws to secure the heat sink to the system board and display-assembly base. Next steps 1. Install
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    6. Remove the heat sink. About this task The following image indicates the location of the processor and provides a visual representation of the removal procedure. 82 Removing and installing components
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    Steps 1. Press the release lever down and then push it away from the processor to release it from the securing tab. 2. Extend the release lever completely, and open the processor cover. CAUTION: When removing the processor, do not touch any of the pins inside the socket or allow any objects to fall
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    84 Removing and installing components
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    triangle on the pin-1 corner on the processor socket. When the processor is properly seated, all four corners are aligned at the same height. If one or more corners of the processor are higher than the others, the processor is not seated properly. 2. Align the notches on the processor with the
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    Rear-I/O bracket Removing the rear-I/O bracket Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the cable cover (optional). 4. Remove the back cover. 5. Remove the system-board shield. 6. Remove the bottom cover. About this task The
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 87
    Steps 1. Remove the screw (M3x5) that secures the power-supply socket to the rear-I/O bracket. 2. Remove the power-supply cable from the routing guide on the rear-I/O bracket. 3. Slide and remove the power-supply socket away from the rear-I/O bracket. 4. Remove the three screws (M3x5) that secure
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    88 Removing and installing components
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    to the display-assembly base. 3. Route the power-supply cables through the routing guide on the rear-I/O bracket. 4. Align the screw hole on the power-supply socket computer. NOTE: Your computer's Service Tag is stored in the system board. You must enter the Service Tag in the BIOS setup program
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    1. Power-supply unit (PSU) cable connector 2. Coin-cell battery 3. Display back-light cable connector 4. Camera cable connector 5. M.2 2230/2280 solid-state drive/Intel Optane PCIe connector 6. Processor-fan cable connector 7. Memory modules 8. Hard-drive connector 9. M.2 2230/2280 solid-state drive
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    1. Power-supply unit (PSU) cable connector 2. Coin-cell battery 3. Display back-light cable connector 4. Camera cable connector 5. M.2 2230/2280 solid-state drive connector 6. Processor-fan cable connector 7. Memory modules 8. Hard-drive connector 9. Side I/O-signal cable connector 10. Side I/O-
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    92 Removing and installing components
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    Steps 1. Disconnect the display back-light cable from the connector on the system board. 2. Disconnect the display cable from the connector on the system board. Removing and installing components 93
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    3. Disconnect the PSU cable from the connector on the system board. 4. Disconnect the PSU fan cable from the connector on the system board. 5. Open the latch and disconnect the power-button board cable from the connector on the system board. 6. Disconnect the speaker cable from the connector on the
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    7. Memory modules 8. Hard-drive connector 9. M.2 2230/2280 solid-state drive PCIe connector 10. SIO-signal cable connector 11. SIO-power cable connector 12. Audio-board cable connector 13. Microphone-module cable connector 14. Speaker cable connector 15. Power-button cable connector 16. Display
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 96
    17. PSU-fan cable connector 18. Touchscreen cable connector 19. Processor The following image indicates the location of the system board and provides a visual representation of the installation procedure. 96 Removing and installing components
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    Steps 1. Align the screw holes on the system board with the screw holes on the display-assembly base. 2. Replace the nine screws (M3x5) to secure the system board to the display-assembly base. Removing and installing components 97
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    optional). 15. Install the stand. 16. Follow the procedure in After working inside your computer. NOTE: Your computer's Service Tag is stored in the system board. You must enter the Service Tag in the BIOS setup program after you replace the system board. NOTE: Replacing the system board removes any
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 99
    About this task The following image indicates the location of the speakers and provides a visual representation of the removal procedure. Removing and installing components 99
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    board. 2. Remove the six screws (M3 4+7.1xZN) that secure the speakers to the display-assembly base. 3. Remove the speaker cable from the routing guides on the display-assembly base. 4. Lift the speakers along with the cable off the display-assembly base. Installing the speakers Prerequisites If you
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    Removing and installing components 101
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    base. 2. Replace the six screws (M3 4+7.1xZN) to secure the speakers to the display-assembly base. 3. Route the speaker cable through the routing guide on display-assembly base and connect the speaker cable to the system board. Next steps 1. Install the rear-I/O bracket. 2. Install the bottom cover
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    5. Remove the system-board shield. 6. Remove the bottom cover. 7. Remove the rear-I/O bracket. 8. Remove the speakers. About this task The following image indicates the location of the power-button board and provides a visual representation of the power-button board removal procedure. Removing and
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 104
    Steps 1. Open the latch and disconnect the power-button board cable from the connector on the system board. 2. Remove the screw (M3x5) that secures the power-button board to the middle frame. 3. Lift the power-button board away from the middle frame. Installing the power-button board Prerequisites
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 105
    Removing and installing components 105
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 106
    Steps 1. Align and place the power-button board in the slot on the middle frame. 2. Replace the screw (M3x5) to secure the power-button board to the middle frame. 3. Slide the power-button board cable into the connector on the system board and close the latch to secure the cable. Next steps 1.
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 107
    Removing and installing components 107
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 108
    Steps 1. Disconnect the microphone cable from the system board, and unroute it from the routing guides on the display-assembly base. 2. Remove the two screws (M2x2.5) that secure the microphone modules to the middle frame. 3. Lift the microphone modules off the
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 109
    middle frame. 2. Replace the two screws (M2X2.5) to secure the microphone modules to the middle frame. 3. Route the microphone cable through the routing guides on the display-assembly base and connect the microphone cable to the system board. Next steps 1. Install the speakers. 2. Install the rear
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 110
    5. Remove the hard drive. 6. Remove the system-board shield. 7. Remove the bottom cover. 8. Remove the rear-I/O bracket. About this task The following image indicates the location of the side I/O-board and provides a visual representation of the removal procedure. 110 Removing and installing
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 111
    -power cable, and audio-board cable from the system board. 4. Remove the SIO-signal cable, SIO-power cable, and audio-board cable from the routing guides on the display-assembly base. 5. Remove the two screws (M2.5x3.5) that secure the side I/O-board to the display-assembly base. 6. Lift and remove
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 112
    112 Removing and installing components
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 113
    .5) to secure the side I/O-board to the display-assembly base. 3. Route the SIO-signal cable, SIO-power cable, and audio-board cable through the routing guides on the display-assembly base. 4. Connect the SIO-signal cable, SIO-power cable, and audio-board cable to the connectors on the system board
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 114
    Audio board Removing the audio board Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the cable cover (optional). 4. Remove the back cover. 5. Remove the system-board shield. 6. Remove the wireless card. 7. Remove the bottom cover. 8.
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 115
    Steps 1. Disconnect the audio-board cable from the connector on the system board. 2. Remove the screw (M3x5) that secure the audio board to the display-assembly base. 3. Lift and remove the audio board with the cable off the display-assembly base. Installing the audio board Prerequisites If you are
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 116
    Steps 1. Align the screw hole on the audio board with the screw hole on the display-assembly base. 2. Replace the screw (M3x5) to secure the audio board to the display-assembly base. 3. Connect the audio-board cable to the system board. Next steps 1. Install the side-I/O board. 2. Install the
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 117
    About this task The following image indicates the location of the antenna modules and provides a visual representation removal procedure of the antenna modules. Removing and installing components 117
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 118
    118 Removing and installing components
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 119
    Steps 1. Remove the antenna cables from the routing guides on the display-assembly base. 2. Remove the two screws (M2x2.5) that secure the antenna modules to the middle frame. 3. Carefully peel the copper foil that
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 120
    120 Removing and installing components
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 121
    frame. 3. Replace the two screws (M2x2.5) to secure the antenna modules to the middle frame. 4. Route the antenna cables through the routing guides on the display-assembly base. Next steps 1. Install the speakers. 2. Install the rear-I/O bracket. 3. Install the bottom cover. 4. Install the wireless
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 122
    8. Install the stand. 9. Follow the procedure in After working inside your computer. Display panel Removing the display panel Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the cable cover (optional). 4. Remove the back cover. 5. Remove
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 123
    Removing and installing components 123
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 124
    Steps 1. Remove the 12 screws (M3x5) that secure the display panel to the middle frame and display-assembly base. 2. Unroute the display back-light cable from the routing guides on the display-assembly base. 3. Place the system in an upright position. 124 Removing and installing components
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 125
    4. Holding the top corner, release the display panel away from the middle frame and display-assembly base. 5. Route the display back-light and display cable through the slots on the display-assembly base. 6. Lift the display panel up from the middle frame and display-assembly base. Installing the
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 126
    126 Removing and installing components
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 127
    . It is used to align the display panel to the displayassembly base. Table 4. Number of jig screws Display type Number of jig screws Touch display One Removing and installing components 127
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 128
    of jig screws (continued) Display type Number of jig screws Non-touch display Three 6. Route the display back-light cable in the routing guides on the display-assembly base. Next steps 1. Install the PSU fan. 2. Install the PSU. 3. Install the system board. 4. Install the camera assembly. 128
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 129
    5. Install the speakers. 6. Install the rear-I/O bracket. 7. Install the bottom cover. 8. Install the hard drive. 9. Install the system-board shield. 10. Install the back cover. 11. Install the cable cover (optional). 12. Install the stand. 13. Follow the procedure in After working inside your
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 130
    130 Removing and installing components
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 131
    Steps 1. Remove the 17 screws (M3x5) that secure the middle frame to the display-assembly base. 2. Remove the middle frame and lift the middle frame off the display-assembly base. Removing and installing components 131
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 132
    Installing the middle frame Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image indicates the location of the middle frame and provides a visual representation of the middle frame installation
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 133
    Removing and installing components 133
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 134
    Steps 1. Slide and align the middle frame to the slots on the display-assembly base, then snap the middle frame into place on the display-assembly base. 2. Replace the 17 screws (M3x5) to secure the middle frame to the display-assembly base. Next steps 1. Install the display panel. 2. Install the
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 135
    3 Software This chapter details the supported operating systems along with instructions on how to install the drivers. Topics: • Operating system • Downloading the drivers Operating system Your Optiplex 5490 supports the following operating systems: ● Windows 10 Home, 64-bit ● Windows 10 IoT
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 136
    4 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
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 137
    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 Overview OptiPlex 7490 All-in-One OptiPlex 5490 All-in-One BIOS Version Displays the BIOS version number. Service Tag Displays the Service Tag
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 138
    Table 5. System setup options-System information menu Overview Memory Available Displays the total computer memory available. Memory Speed Displays the memory speed. Memory Channel Mode Displays single or dual channel mode. Memory Technology Displays the technology used for the memory.
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 139
    Table 7. System setup options-Integrated Devices menu Integrated Devices Date/Time Camera Displays the current date in MM/DD/YYYY format and current time in HH:MM:SS AM/PM format. Enables or disable the camera. By default, the Enable Camera option is selected Audio Enable Audio Enable or disable
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 140
    Mode With Auto Mode, the HTTPs Boot extracts Boot URL from the DHCP. With Manual Mode, the HTTPs Boot reads Boot URL from the user-provided data. By default, the Enable USB PowerShare option is disabled USB Wake Support Enable USB Wake Support When enabled, you can use the USB devices like a
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 141
    , the Block Sleep option is disabled. Deep Sleep Control Enable or disable the Deep Sleep mode support. By default, the Enabled in S4 and S5 option is enabled. Fan Control Override Enable or interface of the optional Absolute Persistence Module service from Absolute software. System setup 141
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 142
    Letter Reinforces password must have at least one upper case letter. By default, the option When enabled, this will disable the master password support. By default, the option is disabled. Allow revert of NVMe hard-drives from the Dell Security Manager prompt. By default, the option is disabled
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 143
    to or greater than the value specified by the Auto OS Recovery Threshold setup option and local Service OS does not boot or is not installed. By default, the option is enabled. Dell Auto OS Recovery Threshold Controls the automatic boot flow for SupportAssist System Resolution Console and for
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 144
    Table 15. System setup options-System Management menu System Management Keyboard Errors Enable Keyboard Error Detection Numlock LED Enable Numlock LED Enable or disable Numlock LED. By default, the option is enabled. Table 16. System setup options-Keyboard menu Keyboard Keyboard Errors
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 145
    . 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
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 146
    5 Troubleshooting Topics: • SupportAssist diagnostics • completed successfully ● View error messages that indicate if problems were encountered during the test NOTE: Some tests are self test About this task The following procedure provides the instructions on how to run the built-in self test for the
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 147
    problem continues, replace the system board. 3 4 Recovery image found but invalid Flash the latest BIOS version. If problem continues, replace the system board. 3 5 Power-rail failure EC ran into power sequencing failure. If problem continues, replace the system board. Troubleshooting 147
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 148
    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/support. Flashing BIOS (USB
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 149
    If you do not have the Service Tag, use the auto-detect feature or manually browse for your computer model. The following procedure provides the instructions on how to conduct a WiFi power cycle: NOTE: Some ISPs (Internet Service Providers) provide a modem/router on your computer. Troubleshooting 149
  • Dell OptiPlex 5490 All-In-One | Service Manual - Page 150
    Dell products and services www.dell.com Tips Contact Support Online help for operating system In Windows search, type Contact Support, and press Enter. www.dell.com/support/windows www.dell.com/support/linux Troubleshooting information, user manuals, setup instructions, www.dell.com/support
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OptiPlex 5490 All-In-One
Service Manual
Regulatory Model: W26C
Regulatory Type: W26C003 / W26C004
April 2021
Rev. A00