Dell OptiPlex 7490 All-In-One Service Manual
Dell OptiPlex 7490 All-In-One Manual
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Dell OptiPlex 7490 All-In-One manual content summary:
- Dell OptiPlex 7490 All-In-One | Service Manual - Page 1
OptiPlex 7490 All-In-One Service Manual Regulatory Model: W26C Regulatory Type: W26C003/W26C004 April 2021 Rev. A00 - Dell OptiPlex 7490 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 7490 All-In-One | Service Manual - Page 3
Contents Chapter 1: Working inside your computer 6 Safety instructions...6 Before working inside your computer...6 Electrostatic discharge-ESD protection...7 ESD field service kit ...7 Transporting sensitive components...8 After working inside your computer...9 Chapter 2: Removing and installing - Dell OptiPlex 7490 All-In-One | Service Manual - Page 4
Installing the coin-cell battery...38 Wireless card...39 Removing the wireless card...39 Installing the wireless card...40 Camera assembly...42 Removing the camera assembly...42 Installing the camera assembly...43 Bottom cover...44 Removing the bottom cover...44 Installing the bottom cover...45 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 5
99 Updating your system BIOS using a USB flash drive 99 Updating the Dell BIOS in Linux and Ubuntu environments 100 System and setup password...100 Assigning BIOS (System Setup) and System passwords 101 Chapter 5: Troubleshooting...102 Display built-in self test...102 SupportAssist diagnostics... - Dell OptiPlex 7490 All-In-One | Service Manual - Page 6
, 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 7490 All-In-One | Service Manual - Page 7
for shut-down instructions. 3. Disconnect such as intermittent problems or a shortened Dell products, the sensitivity to static damage is now higher than in previous Dell damage to recognize and troubleshoot is the intermittent (also on. Once deployed properly, service parts can be removed from - Dell OptiPlex 7490 All-In-One | Service Manual - Page 8
one. desktop or portable environment. Servers are typically installed in a rack within a data center; desktops new service technicians use the traditional wired ESD grounding wrist strap and protective anti-static mat at all times when servicing Dell muscles. Abdominal muscles support your spine when - Dell OptiPlex 7490 All-In-One | Service Manual - Page 9
After working inside your computer About this task CAUTION: Leaving stray or loose screws inside your computer may severely damage your computer. Steps 1. Replace all screws and ensure that no stray screws remain inside your computer. 2. Connect any external devices, peripherals, or cables you - Dell OptiPlex 7490 All-In-One | Service Manual - Page 10
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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 11
Table 1. OptiPlex 7490 All-in-One screw list (continued) Component Screw type Quantity Camera assembly M3x5 2 Camera door M3x5 2 Heat sink-UMA Captive screws 5 Heat sink-Discrete Captive screws 9 Power-supply - Dell OptiPlex 7490 All-In-One | Service Manual - Page 12
Major components of your computer 1. Stand 2. Bottom cover 3. Heat sink 4. Processor fan 5. Processor 6. Memory module 7. M.2 2230/2280 solid-state drive 8. Rear-I/O bracket 9. Side-I/O board 10. Speakers 11. Audio board 12. Display panel 13. Display-assembly base 14. Middle frame 15. Camera- - Dell OptiPlex 7490 All-In-One | Service Manual - Page 13
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 7490 All-In-One | Service Manual - Page 14
in After working inside your computer. Removing the articulating 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. It is recommended to remove the stand to avoid accidental damage - Dell OptiPlex 7490 All-In-One | Service Manual - Page 15
About this task The following image provides a visual representation of the articulating stand removal procedure. Removing and installing components 15 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 16
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. 4. Pry the rubber feet from the bottom cover and pull it out. Installing the articulating stand Prerequisites If - Dell OptiPlex 7490 All-In-One | Service Manual - Page 17
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 7490 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 7490 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 7490 All-In-One | Service Manual - Page 20
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. Lift the cable cover from the bottom cover. 20 Removing and installing components - Dell OptiPlex 7490 All-In-One | Service Manual - Page 21
Installing the cable cover Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image provides a visual representation of the cable cover installation procedure: Removing and installing components - Dell OptiPlex 7490 All-In-One | Service Manual - Page 22
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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 23
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. Removing and installing components - Dell OptiPlex 7490 All-In-One | Service Manual - Page 24
Installing the back cover Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image provides a visual representation of the back cover installation procedure. 24 Removing and installing components - Dell OptiPlex 7490 All-In-One | Service Manual - Page 25
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). 2. Install - Dell OptiPlex 7490 All-In-One | Service Manual - Page 26
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. - Dell OptiPlex 7490 All-In-One | Service Manual - Page 27
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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 28
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 7490 All-In-One | Service Manual - Page 29
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 7490 All-In-One | Service Manual - Page 30
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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 31
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 7490 All-In-One | Service Manual - Page 32
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 7490 All-In-One | Service Manual - Page 33
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 7490 All-In-One | Service Manual - Page 34
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 module Prerequisites CAUTION: Solid-state drives are fragile. - Dell OptiPlex 7490 All-In-One | Service Manual - Page 35
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 7490 All-In-One | Service Manual - Page 36
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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 37
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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 38
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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 39
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 7490 All-In-One | Service Manual - Page 40
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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 41
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 7490 All-In-One | Service Manual - Page 42
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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 43
to the middle frame. 4. Slide and remove the camera assembly from the middle frame. 5. Unroute the camera cable from the routing guides on the display-assembly base. Installing the camera assembly Prerequisites If you are replacing a component, remove the existing component before performing the - Dell OptiPlex 7490 All-In-One | Service Manual - Page 44
2. Slide the camera assembly on the middle frame, and align the screw holes on the camera assembly with the screw holes on the middle frame. 3. Replace the two screws (M3x5) to secure the camera assembly to the middle frame. 4. Connect the camera cable to the system board. 5. Align the screw holes - Dell OptiPlex 7490 All-In-One | Service Manual - Page 45
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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 46
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 7490 All-In-One | Service Manual - Page 47
Removing and installing components 47 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 48
-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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 49
Removing and installing components 49 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 50
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 7490 All-In-One | Service Manual - Page 51
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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 52
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. 2. Install the system-board shield. 3. Install the back cover. 4. Install the cable cover - Dell OptiPlex 7490 All-In-One | Service Manual - Page 53
About this task The following image indicates the location of the heat sink and provides a visual representation of the heat sink removal procedure. 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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 54
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. - Dell OptiPlex 7490 All-In-One | Service Manual - Page 55
About this task The following image indicates the location of the heat sink and provides a visual representation of the heat sink removal procedure. 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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 56
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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 57
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. 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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 58
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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 59
. 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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 60
base. 2. Replace the three screws (M3x5) to secure the rear-I/O bracket 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 with the screw hole on the rear-I/O bracket, and place it in - Dell OptiPlex 7490 All-In-One | Service Manual - Page 61
board Removing the system board Prerequisites 1. Follow the procedure in Before 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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 62
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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 63
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 system board. 7. Disconnect the microphone-module cable from the - Dell OptiPlex 7490 All-In-One | Service Manual - Page 64
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 cable connector 17. - Dell OptiPlex 7490 All-In-One | Service Manual - Page 65
optional). 14. Install the stand. 15. 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 7490 All-In-One | Service Manual - Page 66
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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 67
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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 68
Power-button board Removing the power-button 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 bottom cover. 7. Remove the rear-I/O - Dell OptiPlex 7490 All-In-One | Service Manual - Page 69
Installing the power-button board 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 power-button board and provides a visual representation of the power-button - Dell OptiPlex 7490 All-In-One | Service Manual - Page 70
and provides a visual representation of the removal procedure. 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 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 71
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 7490 All-In-One | Service Manual - Page 72
Side I/O-board Removing the side I/O-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 hard drive. 6. Remove the system-board shield. 7. Remove the bottom cover. 8. - Dell OptiPlex 7490 All-In-One | Service Manual - Page 73
-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 7490 All-In-One | Service Manual - Page 74
.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 7490 All-In-One | Service Manual - Page 75
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 7490 All-In-One | Service Manual - Page 76
3. Connect the audio-board cable to the system board. Next steps 1. Install the side-I/O board. 2. Install the speakers. 3. Install the rear-I/O bracket. 4. Install the bottom cover. 5. Install the wireless card. 6. Install the system-board shield. 7. Install the back cover. 8. Install the cable - Dell OptiPlex 7490 All-In-One | Service Manual - Page 77
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 7490 All-In-One | Service Manual - Page 78
Installing the antenna modules 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 antenna modules and provides a visual representation of the antenna modules - Dell OptiPlex 7490 All-In-One | Service Manual - Page 79
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 7490 All-In-One | Service Manual - Page 80
11. Remove the system board. 12. Remove the PSU. 13. Remove the PSU fan. About this task The following image indicates the location of the display panel and provides a visual representation of the display panel removal procedure. 80 Removing and installing components - Dell OptiPlex 7490 All-In-One | Service Manual - Page 81
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. 4. Holding the top corner, release the display panel away from the - Dell OptiPlex 7490 All-In-One | Service Manual - Page 82
Steps 1. Place the system in an upright position, and slide the display panel on the slots of the display-assembly base. 2. Route the display-backlight, and display cable through the slots on the display-assembly base. 3. Place the display-assembly base on a clean and flat surface with the display - Dell OptiPlex 7490 All-In-One | Service Manual - Page 83
. It is used to align the display panel to the displayassembly base. Table 3. Number of jig screws Display type Number of jig screws Touch display One Non-touch display Three Removing and installing components 83 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 84
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. 5. Install the speakers. 6. - Dell OptiPlex 7490 All-In-One | Service Manual - Page 85
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 85 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 86
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 7490 All-In-One | Service Manual - Page 87
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 7490 All-In-One | Service Manual - Page 88
3 Drivers and downloads When troubleshooting, downloading or installing drivers it is recommended that you read the Dell Knowledge Based article, Drivers and Downloads FAQ SLN128938. 88 Drivers and downloads - Dell OptiPlex 7490 All-In-One | Service Manual - Page 89
: optical drive or hard drive). During the Power-on Self-Test (POST), when the Dell logo appears, you can: ● Access System Setup by pressing F2 key ● Bring up the one-time boot menu by pressing F12 key. The one-time boot menu displays the devices that you can boot from including the diagnostic - Dell OptiPlex 7490 All-In-One | Service Manual - Page 90
section may or may not appear. Table 4. System setup options-System information menu Overview OptiPlex 7490 All-in-One BIOS Version Displays the BIOS version number. Service Tag Displays the Service Tag of the computer. Asset Tag Displays the Asset Tag of the computer. Manufacture Date - Dell OptiPlex 7490 All-In-One | Service Manual - Page 91
Table 4. System setup options-System information menu (continued) Overview DIMM_SLOT 2 Displays the DIMM 2 memory size. Devices Information Panel Type Displays the Panel Type of the computer. Video Controller Displays the video controller type of the computer. Video Memory Displays the - Dell OptiPlex 7490 All-In-One | Service Manual - Page 92
Table 6. System setup options-Integrated Devices menu (continued) Integrated Devices Enable Audio Enable or disable the integrated audio controller. By default, all the options are enabled. USB Configuration ● Enable or disable booting from USB mass storage devices through the boot sequence or - Dell OptiPlex 7490 All-In-One | Service Manual - Page 93
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 7490 All-In-One | Service Manual - Page 94
Intel Speed Shift Technology Enable or disable the Intel speed shift technology support. By default, the Intel Speed Shift Technology option is enabled. disable the BIOS module interface of the optional Absolute Persistence Module service from Absolute software. By default, the option is enabled. - Dell OptiPlex 7490 All-In-One | Service Manual - Page 95
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 (PSID) revert of NVMe hard-drives from the Dell Security Manager prompt. By default, the option is - Dell OptiPlex 7490 All-In-One | Service Manual - Page 96
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 7490 All-In-One | Service Manual - Page 97
provided by Intel Trusted Execution Technology. By default, the option is disabled. Table 18. System setup options-Performance menu Performance Multi Core Support Active Cores Enables to change the number of CPU cores available to the operating system. By default, the All Cores options is - Dell OptiPlex 7490 All-In-One | Service Manual - Page 98
after the BIOS update is completed. Steps 1. Restart the computer. 2. Go to www.dell.com/support. ● Enter the Service Tag or Express Service Code and click Search. ● Click Drivers & Downloads. ● Click Detect Drivers and follow the on-screen instructions. 3. If you are unable to detect or find the - Dell OptiPlex 7490 All-In-One | Service Manual - Page 99
www.dell.com/support/article One Time Boot Menu. 5. Using arrow keys, select USB Storage Device and press Enter. 6. The computer restarts to a Diag C:\> prompt. 7. Run the file by typing the complete filename and press Enter. 8. The BIOS Update Utility is displayed. Follow the on-screen instructions - Dell OptiPlex 7490 All-In-One | Service Manual - Page 100
in a Linux environment such as Ubuntu, see https://www.dell.com/support/article/ sln171755/. System and setup password Table 20. System feature is disabled. Assigning a system setup password Prerequisites You can assign a new System or Admin Password only when the status is in Not Set. About - Dell OptiPlex 7490 All-In-One | Service Manual - Page 101
or Tab. NOTE: If you change the System and/or Setup password, reenter the new password when prompted. If you delete the System and/or Setup password, confirm the clear the system or BIOS passwords, contact Dell technical support as described at www.dell.com/contactdell. NOTE: For information on how - Dell OptiPlex 7490 All-In-One | Service Manual - Page 102
Troubleshooting Display built-in self test About this task The following procedure provides the instructions ● View error messages that indicate if problems were encountered during the test NOTE: As the computer boots, press the F12 key as the Dell logo appears. 3. On the boot menu screen, select - Dell OptiPlex 7490 All-In-One | Service Manual - Page 103
Problem problem continues, replace problem problem continues problem failure continues, replace the memory module. 2 5 Invalid memory installed Reset the memory module. If problem problem continues, replace the system board. 2 7 Display failure Flash the latest BIOS version. If problem If problem - Dell OptiPlex 7490 All-In-One | Service Manual - Page 104
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 7490 All-In-One | Service Manual - Page 105
dell.com/support. 3. Click Product support, enter the Service Tag of your computer, and then click Search. NOTE: If you do not have the Service Tag, use the product ID or manually click the BIOS update file icon and follow the instructions on the screen. WiFi power cycle About this Troubleshooting 105 - Dell OptiPlex 7490 All-In-One | Service Manual - Page 106
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 7490 All-In-One
Service Manual
Regulatory Model: W26C
Regulatory Type: W26C003/W26C004
April 2021
Rev. A00