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Dell 27 All-in-One Owner's Manual

Dell 27 All-in-One Owner's Manual

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Dell 27 All-in-One
EC27250
Owner's Manual
Regulatory Model: W28C
Regulatory Type: W28C001
April 2025
Rev. A01

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Summary of Contents for Dell 27 All-in-One

  • Page 1 Dell 27 All-in-One EC27250 Owner's Manual Regulatory Model: W28C Regulatory Type: W28C001 April 2025 Rev. A01...
  • Page 2 A WARNING indicates a potential for property damage, personal injury, or death. © 2024-2025 Dell Inc. or its subsidiaries. All rights reserved. Dell Technologies, Dell, and other trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be trademarks of their respective owners.

  • Page 3: Table Of Contents

    Bottom....................................11 Service Tag..................................12 Tilt......................................13 Retractable camera................................13 Inside view of your computer............................15 Chapter 2: Set up your computer....................16 Chapter 3: Specifications of Dell 27 All-in-One EC27250............. 22 Dimensions and weight..............................22 Processor.................................... 22 Chipset....................................23 Operating system................................23 Memory....................................23 External ports and slots..............................
  • Page 4 After working inside your computer........................36 BitLocker..................................... 36 Recommended tools................................. 36 Screw list..................................... 37 Major components of Dell 27 All-in-One EC27250....................38 Chapter 5: Removing and installing Customer Replaceable Units (CRUs)........40 Stand....................................40 Removing the stand..............................40 Installing the stand...............................41 Back cover..................................
  • Page 5 Deleting or changing an existing system setup password................106 Clearing CMOS settings..............................107 Clearing system and setup passwords........................107 Chapter 9: Troubleshooting....................... 108 Dell SupportAssist Pre-boot System Performance Check diagnostics.............. 108 Running the SupportAssist Pre-Boot System Performance Check.............. 108 System-diagnostic lights..............................108 Recovering the operating system..........................110...
  • Page 6 Real-Time Clock (RTC Reset)............................110 Backup media and recovery options..........................110 Network power cycle............................... 111 Chapter 10: Getting help and contacting Dell................112 Contents...

  • Page 7: Chapter 1: Views Of Dell 27 All-In-One Ec27250

    Views of Dell 27 All-in-One EC27250 Right Figure 1. Right view 1. USB 3.2 Gen 2 Type-C (10 Gbps) port Connect devices such as external storage devices and printers. Provides data transfer speeds up to 10 Gbps. NOTE: Connected USB devices will not charge when the computer is turned off or in sleep state. Turn on the computer to charge the connected USB devices.

  • Page 8: Front

    1. Retractable-camera assembly Enables you to videochat, capture photos, and record videos. This camera can be retracted to protect your privacy. 2. Display panel Provides visual output to the user. 3. Speakers Provides audio output. Views of Dell 27 All-in-One EC27250...

  • Page 9: Back

    Figure 3. Back view 1. Back cover Removable chassis that covers the internal components of your computer. 2. Back panel Connect USB, audio, video, and other devices. 3. Stand Allows the system to be mounted vertically. Views of Dell 27 All-in-One EC27250...

  • Page 10: Back Panel

    NOTE: Set the BIOS Deep Sleep control to disabled to enable Wake up when the computer is powered off. 8. Universal headset jack Views of Dell 27 All-in-One EC27250...

  • Page 11: Bottom

    Press and hold down this button, and then press the power button to turn on the computer. The built-in color pattern for the LCD monitor will appear on the screen. For more information, see Troubleshooting. 3. Service Tag label Views of Dell 27 All-in-One EC27250...

  • Page 12: Service Tag

    Service Tag The service tag is a unique alphanumeric identifier that allows Dell service technicians to identify the hardware components in your computer and access warranty information. Figure 6. Service Tag location...

  • Page 13: Tilt

    Tilt Isosceles stand Retractable camera Push the top of camera to extend or retract the camera. Extend the camera before use and retract the camera to protect your privacy when not in use. Views of Dell 27 All-in-One EC27250...
  • Page 14 Figure 7. Retractable camera Views of Dell 27 All-in-One EC27250...

  • Page 15: Inside View Of Your Computer

    4. Coin-cell battery 5. Heat sink 6. Fan 7. Memory modules 8. Speaker 9. Media-card reader 10. System board 11. Microphone module 12. Wireless-card slot 13. Speaker 14. Power-button board with Type-C 15. Display-assembly base Views of Dell 27 All-in-One EC27250...

  • Page 16: Chapter 2: Set Up Your Computer

    1. Set up the stand by inserting it into the slot on the back cover until it snaps into place. Figure 9. Install the stand 2. Connect the keyboard and mouse. NOTE: To connect your wireless keyboard and mouse, find User Guides and other resources for your products at Dell Support Site. Set up your computer...
  • Page 17 Figure 10. Connect the keyboard and mouse 3. Connect to your network using a cable. Set up your computer...
  • Page 18 Figure 11. Connect to a network NOTE: Alternatively, you can connect to a wireless network. 4. Connect the power adapter. Set up your computer...
  • Page 19 Figure 12. Connect the power adapter . 5. Press the power button. Set up your computer...
  • Page 20 Figure 13. Press the power button 6. Finish the Windows setup. Follow the on-screen instructions to complete the setup. When setting up, Dell Technologies recommends that you: ● Connect to a network for Windows updates. NOTE: If connecting to a secured wireless network, enter the password for the wireless network access when prompted.
  • Page 21 Resources Description Dell Update Updates your computer with critical fixes and latest device drivers as they become available. For more information about using Dell Update, see the product guides and third-party license documents at Dell Support Site. Set up your computer...

  • Page 22: Chapter 3: Specifications Of Dell 27 All-In-One Ec27250

    The weight of your computer depends on the ● Touchscreen: 14.79 lb (6.71 kg) configuration ordered and manufacturing variability. Processor The following table lists the details of the processors that are supported by your Dell 27 All-in-One EC27250. Table 3. Processor  Description Option one...

  • Page 23: Chipset

    Graphics Intel Iris X Graphics 80EU 96EU Chipset The following table lists the details of the chipset that is supported in your Dell 27 All-in-One EC27250. Table 4. Chipset  Description Option one Option two Processors ● Intel Core 5 120U ●...

  • Page 24: External Ports And Slots

    ● 16 GB, 2 x 8 GB, DDR5, 5200 MT/s, dual-channel ● 32 GB, 2 x 16 GB, DDR5, 5200 MT/s, dual-channel External ports and slots The following table lists the external ports and slots of your Dell 27 All-in-One EC27250. Table 6. External ports and slots  Description...

  • Page 25: Ethernet

    Values Model RTL8111HSD-CG Transfer rate 10/100/1000 Mbps Wireless module The following table lists the Wireless Local Area Network (WLAN) module that is supported on your Dell 27 All-in-One EC27250. Table 9. Wireless module specifications  Description Values Model number Intel AX201...

  • Page 26: Storage

    Digital-array microphones in camera assembly Storage This section lists the storage options on your Dell 27 All-in-One EC27250. Your Dell 27 All-in-One EC27250 supports the M.2 2230 solid-state drive as the primary storage device. Table 11. Storage specifications  Storage type...

  • Page 27: Power Adapter

    Camera 82 degrees 91.20 degrees Infrared camera Not supported 77.90 degrees Power adapter The following table lists the power adapter specifications of your Dell 27 All-in-One EC27250. Table 14. Power-adapter specifications  Description Option one Option two Type 90 W AC...

  • Page 28: Display

    Operating and storage temperature ranges may differ among components, so operating or storing the device outside these ranges may impact the performance of specific components. Display The following table lists the display specifications of your Dell 27 All-in-One EC27250. Table 15. Display specifications  Description...

  • Page 29: Gpu-Integrated

    On board integrated HDMI 1.4 (1920x1080 @ (1920x1080 @ 60 Hz) 60 Hz) GPU—Discrete The following table lists the specifications of the discrete Graphics Processing Unit (GPU) supported by your Dell 27 All-in-One EC27250. Table 18. GPU—Discrete  Controller Memory size...

  • Page 30: Environmental

    Japan Energy Law South Korea E-standby EU RoHS China RoHS Stand The following table provides the height, width, depth, and weight of the stand supported by your Dell 27 All-in-One EC27250 Table 22. Stand  Description Isosceles stand Height 97.56 mm (3.84 in.) Width 66.95 mm (2.63 in.)

  • Page 31: Operating And Storage Environment

    244.84 mm (9.63 in.) 480.40 mm (18.91 in.) 603.70 mm (23.76 in.) Operating and storage environment This table lists the operating and storage specifications of your Dell 27 All-in-One EC27250. Airborne contaminant level: G1 as defined by ISA-S71.04-1985 Table 24. Computer environment  Description...

  • Page 32: Dell Support Policy

    * Measured using a random vibration spectrum that simulates the user environment. † Measured using a 2 ms half-sine pulse. Dell support policy For information about Dell support policy, search in the Knowledge Base Resource at Dell Support Site. Specifications of Dell 27 All-in-One EC27250...

  • Page 33: Chapter 4: Working Inside Your Computer

    You should only perform troubleshooting and repairs as authorized or directed by the Dell technical support team. Damage due to servicing that is not authorized by Dell is not covered by your warranty. See the safety instructions that are shipped with the product or at Dell Regulatory Compliance Home Page.

  • Page 34: Safety Precautions

    Standby power Dell products with standby power must be unplugged before you open the back cover. Systems that are equipped with standby power are powered while turned off. The internal power enables the computer to be remotely turned on (Wake-on-LAN) and suspended into a sleep mode and has other advanced power management features.

  • Page 35: Esd Field Service Kit

    NOTE: It is recommended to always use the traditional wired ESD grounding wrist strap and protective anti-static mat when servicing Dell products. In addition, it is critical to keep sensitive parts separate from all insulator parts while servicing the computer.

  • Page 36: Transporting Sensitive Components

    Transporting sensitive components When transporting ESD sensitive components such as replacement parts or parts to be returned to Dell, it is critical to place these parts in anti-static bags for safe transport. After working inside your computer About this task CAUTION: Leaving stray or loose screws inside your computer may severely damage your computer.

  • Page 37: Screw List

    ● Plastic scribe Screw list NOTE: When removing screws from a component, it is recommended to note the screw type and the quantity of screws, and then place them in a screw storage box. This is to ensure that the correct number of screws and correct screw type is restored when the component is replaced.

  • Page 38: Major Components Of Dell 27 All-In-One Ec27250

    Major components of Dell 27 All-in-One EC27250 The following image shows the major components of Dell 27 All-in-One EC27250. Figure 15. Major components of your computer Working inside your computer...
  • Page 39 1. Back cover 2. I/O cover 3. Isosceles stand 4. Wireless antenna 5. Heat sink 6. Microphone module 7. Fan 8. System board 9. Speakers 10. Middle frame 11. Base panel 12. Power-button board with USB 13. Hinges 14. Media-card reader 15.

  • Page 40: Chapter 5: Removing And Installing Customer Replaceable Units (Crus)

    Removing and installing Customer Replaceable Units (CRUs) The replaceable components in this chapter are Customer Replaceable Units (CRUs). CAUTION: Customers can replace only the Customer Replaceable Units (CRUs) following the safety precautions and replacement procedures. NOTE: The images in this document may differ from your computer depending on the configuration you ordered. Stand Removing the stand Prerequisites...

  • Page 41: Installing The Stand

    Figure 17. Removing the stand Steps 1. Locate the tab on the stand, and push a scribe into the tab to release the stand from the display-assembly base. 2. Lift the stand off the display-assembly base. Installing the stand Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 42: Back Cover

    Figure 18. Installing the stand Insert the stands into the slots on the back cover until they snap into place on the display-assembly base. Next steps Follow the procedure in After working inside your computer. Back cover Removing the back cover Prerequisites 1.

  • Page 43: Installing The Back Cover

    About this task The following image indicates the location of the back cover and provides a visual representation of the removal procedure. Figure 20. Removing back cover Steps 1. Place your palm in the middle of the back cover, and then pry the back cover from the display-assembly base starting from the top corners.

  • Page 44: I/O Cover

    Figure 21. Installing the back cover Steps Align the slots on the back cover with the slots on the computer, and press along the side to snap the back cover into place. Next steps 1. Follow the procedure in After working inside your computer.

  • Page 45: Installing The I/O Cover

    Figure 22. Removing I/O cover Steps 1. Remove the five screws (M3x5) that secure the I/O cover to the display-assembly base. 2. Using a pry tool, pry open the corners of the I/O cover. 3. Lift the I/O cover off the display-assembly base. Installing the I/O cover Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 46: Stand Hinges

    Figure 23. Installing bottom cover Steps 1. Place the I/O cover on the display-assembly base. 2. Align the screw holes on the I/O cover with the screw holes on the display-assembly base. 3. Replace the two screws (M3x5) that secure the I/O cover to the display-assembly base and snap the I/O cover back into place.

  • Page 47: Installing The Stand Hinges

    Figure 24. Removing the stand hinges Steps 1. Remove the 10 screws (M3x4.5) that secure the right and left stand hinges to the display-assembly base. 2. Lift the stand hinges off the display-assembly base. Installing the stand hinges Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. NOTE: For replacement of stand or stand hinges, the replacement kit is shipped with both stand and stand hinges.

  • Page 48: System-Board Shield

    Figure 25. Installing the stand hinges Steps 1. Align the screw holes on the stand hinges with the screw holes on the display-assembly base. 2. Replace the 10 screws (M3x4.5) that secure the stand hinges to the display-assembly base. Next steps 1.

  • Page 49: Installing The System-Board Shield

    Figure 26. Removing the system-board shield Steps 1. Remove the four 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 the installation procedure. NOTE: The etchings on the system-board shield do not represent the components that are supported by this computer.

  • Page 50: Solid State Drive (Ssd)

    Figure 27. Installing the system-board shield Steps 1. Align the screw holes on the system-board shield with the slots on the display-assembly base. 2. Place the system-board shield on the display-assembly base. 3. Replace the four screws (M3x5) that secure the system-board shield to the display-assembly base. Next steps 1.

  • Page 51: Installing The M.2 2230 Solid-State Drive

    About this task The following image indicates the location of the solid-state drive and provides a visual representation of the removal procedure. Figure 28. Removing the M.2 2230 solid-state drive Steps 1. Remove the screw (M2x3.5) that secures the solid-state drive to the system board. 2.

  • Page 52: Memory Module

    Figure 29. Installing the M.2 2230 solid-state drive Steps 1. Ensure that the thermal pad covering the M.2 2230 slot on the system board is in place. 2. Align the notch on the solid-state drive with the tab on the M.2 card slot. 3.

  • Page 53: Installing The Memory Module

    Figure 30. Removing the memory module Steps 1. Carefully spread apart the securing-clips on each end of the memory-module slot until the memory module is released. 2. Slide and remove the memory module from the memory-module slot. NOTE: Repeat steps 1 and 2 if you want to remove the other memory module. Installing the memory module Prerequisites CAUTION:...

  • Page 54: Wireless Card

    Figure 31. Installing the memory module 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.

  • Page 55: Installing The Wireless Card

    Figure 32. Removing the wireless card Steps 1. Remove the screw (M2x3.5) that secures the wireless-card bracket to the wireless card. 2. Slide and lift the wireless-card bracket off the wireless card. 3. Disconnect the antenna cables from the wireless card. 4.
  • Page 56 About this task The following image indicates the location of the wireless card and provides a visual representation of the installation procedure. Figure 33. Installing the wireless card Steps 1. Connect the antenna cables to the wireless card. The following table provides the antenna-cable color scheme for the wireless card that is supported by your computer. Table 26.

  • Page 57: Retractable-Camera Assembly

    4. Slide the wireless card at an angle into the wireless-card slot. 5. Replace the screw (M2x3.5) that secures the wireless-card bracket to the wireless card. Next steps 1. Install the system-board shield. 2. Install the cover. 3. Install the back cover.

  • Page 58: Installing The Retractable-Camera Assembly

    4. Remove the retractable-camera assembly from the display-assembly base. Installing the retractable-camera assembly 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 retractable-camera assembly and provides a visual representation of the installation procedure.

  • Page 59: Fan

    Removing the fan Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the back cover. 4. Remove the cover. 5. Remove the system-board shield. About this task The following image indicates the location of the fan and provides a visual representation of the removal procedure. Figure 36.

  • Page 60: Speakers

    Figure 37. Installing the fan Steps 1. Align the screw holes on the fan with the screw holes on the display-assembly base. 2. Replace the three screws (M2x3.5) that secure the fan to the display-assembly base. 3. Route the fan cable through the routing post on the display-assembly base. 4.

  • Page 61: Installing The Speakers

    Figure 38. Removing the speakers Steps 1. Disconnect the speaker cable from its connector (SPK1) the system board. 2. Remove the speaker cable from the routing guides on the display-assembly base. 3. Lift the speakers along with the cable off the display-assembly base. Installing the speakers Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 62: Coin-Cell Battery

    Figure 39. Installing the speakers Steps 1. Using the alignment posts and rubber grommets, place the speakers on the slots on the display-assembly base. 2. Route the speaker cable through the routing guide on the display-assembly base. 3. Connect the speaker cable to its connector (SPK1) on the system board. Next steps 1.

  • Page 63: Installing The Coin-Cell Battery

    Figure 40. Removing the coin-cell battery Steps 1. Press the metal tab to release the coin-cell battery from the coin-cell battery socket. 2. Lift the coin-cell battery from the coin-cell battery socket. Installing the coin-cell battery 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 coin-cell battery and provides a visual representation of the installation procedure.
  • Page 64 Figure 41. Installing the coin-cell battery Steps With the positive-side facing up, insert the coin-cell battery into the battery socket on the system board and snap the battery into place. Next steps 1. Install the system-board shield. 2. Install the cover.

  • Page 65: Chapter 6: Removing And Installing Field Replaceable Units (Frus)

    To avoid any potential damage to the component or loss of data, ensure that an authorized service technician replaces the Field Replaceable Units (FRUs). CAUTION: Dell Technologies recommends that this set of repairs, if needed, to be conducted by trained technical repair specialists. CAUTION: As a reminder, your warranty does not cover damages that may occur during FRU repairs that are not authorized by Dell Technologies.

  • Page 66: Installing The Heat Sink- Uma

    Figure 42. Removing the heat sink- UMA Steps 1. In reverse sequential order (5>4>3>2>1), loosen the five captive screws that secure the heat sink to the system board. 2. Lift the heat sink off the system board. Installing the heat sink- UMA CAUTION: The information in this section is intended for authorized service technicians only.

  • Page 67: Removing The Heat Sink- Discrete

    Figure 43. Installing the heat sink- UMA Steps 1. Align the screw holes on the heat sink with the screw holes on the system board. 2. In sequential order (1>2>3>4>5), tighten the five captive screws that secure the heat sink to the system board. Next steps 1.

  • Page 68: Installing The Heat Sink- Discrete

    Figure 44. Removing the heat sink- discrete Steps 1. In reverse sequential order (7>6>5>4>3>2>1), loosen the seven captive screws that secure the heat sink to the system board. 2. Lift the heat sink off the system board. Installing the heat sink- discrete CAUTION: The information in this section is intended for authorized service technicians only.

  • Page 69: Media-Card Reader

    Figure 45. Installing the heat sink- discrete Steps 1. Align the screw holes on the heat sink with the screw holes on the system board. 2. In sequential order (1>2>3>4>5>6>7), tighten the seven captive screws that secure the heat sink to the system board. Next steps 1.

  • Page 70: Installing The Media-Card Reader

    Figure 46. Removing the media-card reader Steps 1. Remove the screw (M3x3.5) that secures the media-card reader to the display-assembly base. 2. Open the latch and disconnect the media-card reader cable from its connector (SD CARD) on the system board. 3.

  • Page 71: Power-Button Board With Usb

    Figure 47. Installing the media-card reader Steps 1. Slide the media-card reader under the system board and align the screw hole on the media-card reader with the screw hole on the display-assembly base. NOTE: Ensure that the media-card reader cable stays above the system board. 2.

  • Page 72: Installing The Power-Button Board With Usb

    About this task The following image indicates the location of the power-button board with USB and provides a visual representation of the removal procedure. Figure 48. Removing the power-button board with USB Steps 1. Remove the five screws (M3x4.5) that secure the left-stand hinge to the display-assembly base. 2.
  • Page 73 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 with USB and provides a visual representation of the installation procedure. Figure 49.

  • Page 74: System Board

    2. Install the cover. 3. Install the back cover. 4. Install the stand. 5. Follow the procedure in After working inside your computer. System board Removing the system board CAUTION: The information in this section is intended for authorized service technicians only. Prerequisites NOTE: Your computer’s Service Tag is stored in the system board.
  • Page 75 Figure 50. System-board connectors 1. Solid-state drive slot (M.2 PCIe SSD) 2. Touchscreen-cable connector (optional) (TOUCH) 3. Camera-cable connector (WEBCAM) 4. Backlight-cable connector (BL) 5. Fan cable connector (FAN1) 6. Coin-cell battery (RTC) 7. Memory-module slots (DIMM2, DIMM1) 8. Speaker-cable connector (SPK1) 9.
  • Page 76 Figure 51. Removing the system board Removing and installing Field Replaceable Units (FRUs)

  • Page 77: Installing The System Board

    Figure 52. Lifting the system board off the chassis Steps 1. Disconnect the touchscreen cable from its connector (TOUCH) on the system board. NOTE: This cable is only available on computers that support the touch option. 2. Disconnect the camera cable from its connector (WEBCAM) on the system board. 3.
  • Page 78 Figure 53. System-board connectors 1. Solid-state drive slot (M.2 PCIe SSD) 2. Touchscreen-cable connector (optional) (TOUCH) 3. Camera-cable connector (WEBCAM) 4. Backlight-cable connector (BL) 5. Fan cable connector (FAN1) 6. Coin-cell battery (RTC) 7. Memory-module slots (DIMM2, DIMM1) 8. Speaker-cable connector (SPK1) 9.
  • Page 79 Figure 54. Placing the system board in the chassis Removing and installing Field Replaceable Units (FRUs)
  • Page 80 Figure 55. Installing the system board Steps 1. Place the system board on the display-assembly base. 2. Align the screw holes on the system board with the screw holes on the display-assembly base. 3. Replace the six screws (M3x5) that secure the system board to the display-assembly base. 4.

  • Page 81: Microphone Module

    8. Install the stand. 9. 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 changes that you have made to the BIOS using the BIOS setup program.

  • Page 82: Installing The Microphone Module

    2. Peel the tape that secures the microphone-module cable to the display-assembly base. 3. Remove the microphone-module cable from the routing guides on the display-assembly base. 4. Lift the microphone module off the display-assembly base. Installing the microphone module CAUTION: The information in this section is intended for authorized service technicians only.

  • Page 83: Antennas

    Antennas Removing the antennas CAUTION: The information in this section is intended for authorized service technicians only. Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the back cover. 4. Remove the cover.

  • Page 84: Installing The Antennas

    3. Lift the antenna module off the display-assembly base. Installing the antennas CAUTION: The information in this section is intended for authorized service technicians only. 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 antennas and provides a visual representation of the installation procedure.

  • Page 85: Display Panel

    10. Install the cover. 11. Install the back cover. 12. Install the stand. 13. Follow the procedure in After working inside your computer. Display panel Removing the display panel CAUTION: The information in this section is intended for authorized service technicians only. Prerequisites 1.
  • Page 86 Figure 60. Removing the screws Figure 61. Removing the display panel Removing and installing Field Replaceable Units (FRUs)

  • Page 87: Installing The Display Panel

    Steps 1. Remove the 12 screws (M3x5) that secure the display panel to the display-assembly base. 2. Remove the five screws (M3x5.3) that secure the display panel to the display-assembly base. 3. Place the computer in an upright position. 4. Holding the top corner, push the display panel away from the display-assembly base using the push holes available on the display-assembly base.
  • Page 88 Figure 63. Replacing the screws Steps 1. Slide and insert the display panel into the slot on the display-assembly base. 2. Route the display-backlight cable, touchscreen cable, and display cable on the display panel through the slots on the display-assembly base. 3.

  • Page 89: Middle Frame Assembly

    Middle frame assembly Removing the middle-frame assembly CAUTION: The information in this section is intended for authorized service technicians only. Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the back cover. 4.

  • Page 90: Installing The Middle-Frame Assembly

    Steps After performing the pre-requisites, you are left with the middle-frame assembly. NOTE: The middle-frame assembly consists of the following: ● Middle frame ● Base panel ● Wireless antennas (2) Installing the middle-frame assembly CAUTION: The information in this section is intended for authorized service technicians only. Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.
  • Page 91 Next steps 1. Install the display panel. 2. Install the power-button board with USB. 3. Install the stand hinges. 4. Install the microphones. 5. Install the speakers. 6. Install the system board. 7. Install the integrated heat sink discrete heat sink, as applicable.

  • Page 92: Chapter 7: Software

    Your Dell 27 All-in-One EC27250 supports the following operating systems: ● Windows 11 Pro ● Windows 11 Home Drivers and downloads When troubleshooting, downloading, or installing drivers, it is recommended that you read the Dell Knowledge Base article Drivers and Downloads FAQs 000123347. Software...

  • Page 93: Chapter 8: Bios Setup

    About this task Turn on (or restart) your computer and press F2 immediately. NOTE: If you are connected to the Dell Pro Wireless Keyboard KM5221W, press Fn+F2. Navigation keys NOTE: For most of the BIOS Setup options, changes that you make are recorded but do not take effect until you restart the computer.

  • Page 94: System Setup Options

    Depending on your computer and its installed devices, the items that are listed in this section may or may not be displayed. Table 28. System setup options—Overview menu  Overview Dell 27 All-in-One EC27250 BIOS Version Displays the BIOS version number. Service Tag Displays the Service Tag of the computer.
  • Page 95 The computer stops booting to the operating system when a component is not authenticated during the boot process. Secure Boot can be enabled in BIOS setup or using management interfaces like Dell Command|Configure, but can only be disabled from BIOS setup.
  • Page 96 Table 29. System setup options—Boot Configuration menu (continued) Boot Configuration By default, the Enable Custom Mode option is disabled. Custom Mode Key Management Selects the custom values for expert key management. By default, the PK option is selected. Table 30. System setup options—Integrated Devices menu  Integrated Devices Date/Time Date...
  • Page 97 Table 31. System setup options—Storage menu (continued) Storage Enable SMART reporting If S.M.A.R.T. (Self-monitoring, Analysis, and Reporting Technology) is enabled the BIOS can receive analytical information from integrated devices and send notifications during startup about possible failure of the device. By default, the option is disabled. Drive Information Displays the drive type and device name.
  • Page 98 Table 34. System setup options—Power menu (continued) Power Enable USB PowerShare Enables or disables external devices (phones, portable music players) to be power or charged using system battery. By default, the option is disabled. USB Wake Support Enable USB Wake support Enable or disable USB devices like a mouse or keyboard to wake the system from Standby, Hibernate, and Power Off.
  • Page 99 By default, the Start Data Wipe option is disabled. Absolute Absolute Software provides various cyber security solutions, some requiring software preloaded on Dell computers and integrated into the BIOS. To use these features, you must enable the Absolute BIOS setting and contact Absolute for configuration and activation.
  • Page 100 BIOS passwords. You can modify the minimum and maximum length of the passwords and require passwords to contain certain character classes (upper case, lower case, digit, special character). Dell Technologies recommends setting the minimum password length to at least eight characters. Password Bypass The Password Bypass option allows the computer to reboot from the operating system without entering the computer or hard drive password.
  • Page 101 When an internal hard drive password is set, it must first be cleared before Master Password Lockout can be changed. By default, the Enable Master Password Lockout option is disabled. Dell does not recommend enabling the Master Password Lockout unless you have implemented your own password recovery computer. Allow Non-Admin PSID Revert This option controls access to the Physical Security ID (PSID) revert of NVMe storage drives from the Dell Security Manager prompt.
  • Page 102 Allows you to control the automatic boot flow for SupportAssist System Resolution Console and for Dell operating system Recovery Tool. By default, the Dell Auto OS Recovery Threshold value is set to 2. Table 38. System setup options—System Management menu ...
  • Page 103 This option is not available when the virtualization setting for IOMMU is disabled (VT-d/AMD Vi). By default, the Enable Pre-Boot DMA Support option is enabled. For additional security, Dell Technologies recommends keeping the Enable Pre- Boot DMA Support option enabled. NOTE: This option is provided only for compatibility purposes, since some older hardware is not DMA capable.

  • Page 104: Updating The Bios

    4. Connect the bootable USB drive to the computer that needs the BIOS update. 5. Restart the computer and press F12 . NOTE: If you are connected to the Dell Pro Wireless Keyboard KM5221W, press Fn+F12. 6. Select the USB drive from the One Time Boot Menu. BIOS Setup...

  • Page 105: Updating The Bios From The One Time Boot Menu

    Time Boot menu on the computer. Most of the Dell computers built after 2012 have this capability, and you can confirm by booting your computer to the One Time Boot Menu to see if BIOS FLASH UPDATE is listed as a boot option for your computer. If the option is listed, then the BIOS supports this BIOS update option.

  • Page 106: Assigning A System Setup Password

    To enter the system setup, press F12 immediately after a power-on or reboot. NOTE: If you are connected to the Dell Pro Wireless Keyboard KM5221W, press Fn+F12. Steps 1. In the System BIOS or System Setup screen, select Security and press Enter.

  • Page 107: Clearing Cmos Settings

    When you release the power button, the CMOS settings are cleared and the computer restarts. A dialog box is displayed, with options to run BIOS-Setup and Diagnostics. Clearing system and setup passwords About this task To clear the system or setup passwords, contact Dell technical support as described at Contact Support. NOTE: For information about how to reset Windows or application passwords, see the documentation accompanying Windows or your application.

  • Page 108: Chapter 9: Troubleshooting

    Check diagnostics About this task SupportAssist diagnostics (also known as system diagnostics) performs a complete check of your hardware. The Dell SupportAssist Pre-boot System Performance Check diagnostics is embedded within the BIOS and launched by the BIOS internally. The embedded system diagnostics provides options for particular devices or device groups allowing you to: ●...
  • Page 109 (AC, battery, coin cell) and errors drain flea power by pressing and holding down power button for 3~5 seconds. CPU failure ● Run the Dell Support Assist/Dell Diagnostics tool. ● If problem persists, replace the system board. System board failure (included ●...

  • Page 110: Recovering The Operating System

    It enables you to diagnose hardware issues, repair your computer, back up your files, and restore your computer to its factory state. You can also download it from the Dell Support website to troubleshoot and fix your computer when it fails to boot into the primary operating system due to software or hardware failures.

  • Page 111: Network Power Cycle

    Network power cycle About this task If your computer is unable to access the Internet due to network connectivity issues, reset your network devices by performing the following steps: Steps 1. Turn off the computer. 2. Turn off the modem. NOTE: Some Internet service providers (ISPs) provide a modem and router combo device.

  • Page 112: Chapter 10: Getting Help And Contacting Dell

    Getting help and contacting Dell Self-help resources You can get information and help on Dell products and services using these self-help resources: Table 46. Self-help resources  Self-help resources Resource location Information about Dell products and services Dell Site Tips Contact Support In Windows search, type Contact Support, and press Enter.

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