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Dell W23C Service Manual
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Dell W23C Service Manual

Dell W23C Service Manual

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Inspiron 27-7700
Service Manual
Regulatory Model: W23C
Regulatory Type: W23C002
March 2021
Rev. A02

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Summary of Contents for Dell W23C

  • Page 1 Inspiron 27-7700 Service Manual Regulatory Model: W23C Regulatory Type: W23C002 March 2021 Rev. A02...
  • Page 2 A WARNING indicates a potential for property damage, personal injury, or death. © 2020-2021 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 trademarks of their respective owners.

  • Page 3: Table Of Contents

    Contents Chapter 1: Safety instructions.......................6 Before working inside your computer..........................6 Before you begin ................................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 components................10 Inside view of your computer............................10 Recommended tools................................11 Screw list....................................
  • Page 4 Clearing CMOS settings..............................64 Clearing BIOS (System Setup) and System passwords..................64 Chapter 5: Troubleshooting......................65 SupportAssist diagnostics...............................65 Locate the Service Tag or Express Service Code of your Dell computer ..........65 Display built-in self test..............................65 Diagnostics..................................66 Recovering the operating system..........................66...
  • Page 5 Flashing BIOS (USB key)..............................67 Flashing the BIOS................................67 WiFi power cycle................................67 Flea power release................................68 Chapter 6: Getting help and contacting Dell................69 Contents...

  • Page 6: Chapter 1: Safety Instructions

    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.com/regulatory_compliance.

  • Page 7: Electrostatic Discharge-Esd Protection

    ESD protection is an increasing concern. Due to the increased density of semiconductors used in recent Dell products, the sensitivity to static damage is now higher than in previous Dell products. For this reason, some previously approved methods of handling parts are no longer applicable.

  • Page 8: Transporting Sensitive Components

    It is recommended that all field service technicians use the traditional wired ESD grounding wrist strap and protective anti-static mat at all times when servicing Dell products. In addition, it is critical that technicians keep sensitive parts separate from all insulator parts while performing service and that they use anti-static bags for transporting sensitive components.

  • Page 9: After Working Inside Your Computer

    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 removed before working on your computer. 3.

  • Page 10: Chapter 2: Removing And Installing Components

    Removing and installing components NOTE: The images in this document may differ from your computer depending on the configuration you ordered. Topics: • Inside view of your computer • Recommended tools • Screw list • Back cover • Bottom cover •...

  • Page 11: Recommended Tools

    1. coin-cell battery 2. retractable-camera assembly 3. memory modules 4. base panel 5. display-assembly base 6. hard drive 7. system board 8. solid-state drive 9. microphones (2) 10. wireless-card shield 11. media-card reader 12. stand 13. speakers (2) 14. password clear jumper 15.
  • Page 12 Table 1. Screw list Component Secured to Screw type Quantity Screw image Stand Display-assembly base M3x4 Bottom cover Display-assembly base M3 0.5x5 Hard-drive assembly Display-assembly base M3 0.5x5 Hard-drive bracket Hard drive M3x3.5 System-board shield Display-assembly base M3 0.5x5 Retractable-camera Base panel M3 0.5x5 assembly door...

  • Page 13: Back Cover

    Back cover Removing the back cover Prerequisites 1. Follow the procedure in Before working inside your computer. CAUTION: When servicing the computer, place it on an elevated, clean and flat surface. Place the display flat on the surface with the stand hanging over the edge. It is recommended to remove the stand to avoid accidental damage to the computer display during servicing.

  • Page 14: Installing The Back Cover

    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 indicates the location of the back cover and provides a visual representation of the installation procedure. 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.

  • Page 15: Installing The Bottom Cover

    Steps 1. Remove the five screws (M3x5) that secure the bottom cover to the display-assembly base. 2. 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 installation procedure. About this task The following image indicates the location of the bottom cover and provides a visual representation of the installation procedure.

  • Page 16: Stand

    Steps 1. Align the screw holes on the bottom cover with the screw holes on the display-assembly base. 2. Replace the five screws (M3x5) that secure the bottom cover to the display-assembly base and snap the bottom cover back into place. Next steps 1.

  • Page 17: Installing The Stand

    Steps 1. In the reverse sequential order indicated on the stand, remove the eight screws (M3x4) that secure the stand to the display-assembly base. 2. Remove the stand from the slots on the display-assembly base and 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 18: Hard Drive

    Steps 1. Align the screw holes on the stand with the screw holes on the display-assembly base and slide the stand on the display- assembly base. 2. In the sequential order indicated on the stand, replace the eight screws (M3x4) that secure the stand to the display- assembly base.

  • Page 19: Installing The Hard Drive

    Steps 1. Remove the two screws (M3x5) that secure the hard-drive assembly to the display-assembly base. 2. Slide the hard-drive assembly away from the hard-drive slot on the display-assembly base. 3. Remove the four screws (M3x3.5) that secure the hard-drive bracket to the hard drive. 4.

  • Page 20: System-Board Shield

    Steps 1. Align the screw holes on the hard drive with the screw holes on the hard-drive bracket. 2. Replace the four screws (M3x3.5) that secure the hard-drive bracket to the hard drive. 3. Slide the hard-drive assembly into the slot on the display-assembly base. 4.

  • Page 21: Installing 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. About this task The following image indicates the location of the system-board shield and provides a visual representation of the installation procedure.

  • Page 22: Memory Modules

    Steps 1. Align the slots on the system-board shield with the ports on the computer. 2. Replace the four screws (M3x5) that secure the system-board shield to the display-assembly base. Next steps 1. Install the stand. 2. Install the bottom cover.

  • Page 23: Installing The Memory Modules

    Steps 1. Using your fingertips, spread apart the securing clips on the memory-module slot until the memory module pops up. 2. Slide and remove the memory module from the memory-module slot. NOTE: Repeat step 1 and 2 if there are two memory modules. Installing the memory modules Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 24: Heat Sink

    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 25: Installing The Heat Sink

    Steps 1. In reverse sequential order (as indicated on the heat sink), loosen the eight captive screws that secure the heat sink to the system board and the display-assembly base. 2. Lift the heat sink off the system board and display-assembly base. Installing the heat sink Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 26: Wireless Card

    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 eight captive screws that secure the heat sink to the system board and display assembly base.
  • Page 27 Steps 1. Remove the two screws (M2x4) that secure the wireless-card shield to the system board. 2. Lift the wireless-card shield off the system board and wireless card. 3. Remove the screw (M2x4) that secures the wireless-card bracket to the wireless card. 4.

  • Page 28: Installing The Wireless Card

    5. Disconnect the antenna cables from the wireless card. 6. Slide and remove the wireless card from the wireless-card slot. Installing the wireless card Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. CAUTION: To avoid damage to the wireless mini-card, do not place any cables under it.

  • Page 29: Solid-State Drive

    Steps 1. Connect the antenna cables to the wireless card. The following table provides the antenna-cable color scheme for the wireless card supported by your computer. Table 2. Antenna-cable color scheme Connectors on the wireless card Antenna-cable color Main (white triangle) White Auxiliary (black triangle) Black...

  • Page 30: Installing The Solid-State Drive

    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 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.
  • Page 31 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) that secures the solid-state drive to the system board. Next steps 1.

  • Page 32: Media-Card Reader

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

  • Page 33: Speakers

    Steps 1. Connect the media-card reader cable to the system board and close the latch to secure the cable. 2. Insert the media-card reader into the media-card reader slot. 3. Align the screws on the media-card reader with the screw holes on the slot on the display assembly base. 4.

  • Page 34: Installing The Speakers

    Steps 1. Disconnect the speaker cable from the system board and remove it from the routing guide on display-assembly base. 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.

  • Page 35: Microphones

    Steps 1. Align the screw holes on the speakers with the screw holes on the display-assembly base and route the cable through the routing guides on display-assembly base. 2. Replace the eight screws (M3 4+7.1xZN) that secure the speakers to the display-assembly base. 3.

  • Page 36: Installing The Mircrophones

    Steps 1. Disconnect the microphone cable from the system board and release it from the routing guides on the display-assembly base. 2. Remove the eight screws (M2X2.5) that secure the microphone modules (2) to the base panel and release them from the routing guides on the display-assembly base.

  • Page 37: Fan

    Steps 1. Align the microphone modules (2) with their slots on the base panel. 2. Route the cable through the routing guides on the display-assembly base. 3. Replace the eight screws (M2X2.5) that secure the microphone module to the base panel. 4.

  • Page 38: Installing The Fan

    3. Remove the bottom cover. 4. Remove the stand. 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. Steps 1. Disconnect the fan cable from the system board. 2.

  • Page 39: Antennas

    Steps 1. Align the screw holes on the fan with the screw holes on the display-assembly base. 2. Replace the three screws (M2x2.5) that secure the fan to the display-assembly base. 3. Route the fan cable through the routing guides on the display-assembly base. 4.

  • Page 40: Installing The Antennas

    NOTE: Note the routing of the antenna cables, before removing the antenna cables form the routing guides. Also, note the location of the antenna modules printed on the display-assembly base as ANT-B (black) and ANT-W (white). Steps 1. Remove the antenna cables from the routing guides on the display-assembly base. 2.

  • Page 41: Camera

    NOTE: Note the location of the antenna modules printed on the display-assembly base as ANT-B (black) and ANT-W (white). Steps 1. Align the antenna modules (2) with the slots on the base panel and adhere it in place. 2. Adhere the copper foil that secures the antenna cables (2) to the base panel. 3.

  • Page 42: Installing The Camera

    About this task The following image indicates the location of the camera and provides a visual representation of the removal procedure. Steps 1. Disconnect the camera cable from the system board. 2. Remove the camera cable from the routing guides on the display-assembly base. 3.

  • Page 43: Power-Button Board

    Steps 1. Slide and place the retractable-camera assembly on the base panel. 2. Replace the two screws (M3x5) that secure the retractable-camera assembly to the base panel. 3. Route the camera cable through the routing guides on the display-assembly base. 4.

  • Page 44: Installing The Power-Button Board

    Steps 1. Open the notch on the side of the power-button board and lift the power-button board from the slot on the base panel. 2. Open the latch, disconnect the power-button board cable from the power-button board then lift off the power-button board.

  • Page 45: System Board

    Steps 1. Connect the power-button board cable to the power-button board and close the latch to secure the cable. 2. Align and place the power-button board in the slot on the base panel and snap it into place. Next steps 1.
  • Page 46 7. Remove the wireless card. 8. Remove the solid-state drive. 9. Remove the heat sink. About this task The following image indicates the connectors on your system board. Figure 1. System-board connectors 1. Camera cable 2. Touchscreen cable 3. Debug port 4.

  • Page 47: Installing The System Board

    Steps 1. Disconnect the backlit cable from the system board. 2. Disconnect the display cable from the system board. 3. Open the latch and disconnect the power-button board cable from the system board. 4. Disconnect the speaker cable from the system board. 5.
  • Page 48 About this task The following image indicates the connectors on your system board. Figure 2. System-board connectors 1. Camera cable 2. Touchscreen cable 3. Debug port 4. Coin-cell battery 5. Fan cable 6. Microphones cable 7. Media-card reader cable 8. Speaker cable 9.

  • Page 49: Base Panel

    Next steps 1. Install the heat sink. 2. Install the solid-state drive. 3. Install the wireless card. 4. Install the memory modules. 5. Install the system-board shield. 6. Install the stand. 7. Install the bottom cover. 8. Install the back cover.
  • Page 50 Removing and installing components...

  • Page 51: Installing The Base Panel

    Steps 1. Remove the 21 screws (M3x5) that secure the base panel to the display-assembly base. 2. Remove the base panel and lift the base panel off the display-assembly base. Installing the base panel 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 base panel and provides a visual representation of the installation procedure.

  • Page 52: Display Panel

    Steps 1. Align the screw holes on the base panel with the screw holes on the display-assembly base. 2. Replace the 21 screws (M3x5) that secures the base panel to the display-assembly base. Next steps 1. Install the display panel. 2.
  • Page 53 2. Remove the back cover. 3. Remove the bottom cover. 4. Remove the stand. 5. Remove the hard drive. 6. Remove the system-board shield. 7. Remove the system board. About this task The following image indicates the location of display panel and provides a visual representation of the removal procedure. Removing and installing components...

  • Page 54: Installing The Display Panel

    Steps 1. Remove the 12 screws (M3x5) that secure the display panel to the display-assembly base. 2. Place the computer in an upright position. 3. 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 55 Removing and installing components...
  • Page 56 Steps 1. Align and place the display panel on the slots of the display-assembly base. 2. Route the display back-light, touch screen and display cable though the slots on the display assembly base. 3. Place the display-assembly base on a clean and flat surface with the display panel facing down. 4.

  • Page 57: Chapter 3: Device Drivers

    Wireless and Bluetooth drivers Intel Chipset Software Installation Utility In the Device Manager, check if the chipset driver is installed. Install the Intel chipset updates from www.dell.com/support. Video drivers In the Device Manager, check if the video driver is installed.

  • Page 58: Chapter 4: System Setup

    System setup NOTE: Depending on the computer and its installed devices, the items listed in this section may or may not be displayed. Topics: • System setup • Entering BIOS setup program • Navigation keys • Boot Sequence • System setup options •...

  • Page 59: Boot Sequence

    Boot Sequence allows you to bypass the System Setup–defined boot device order and boot directly to a specific device (for example: 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 ●...
  • Page 60 Table 3. System setup options—System information menu General-System Information Core Count Displays the number of cores on the processor. Processor ID Displays the processor identification code. Current Clock Speed Displays the current processor clock speed. Minimum Clock Speed Displays the minimum processor clock speed. Maximum Clock Speed Displays the maximum processor clock speed.
  • Page 61 Table 4. System setup options—System Configuration menu System Configuration Enable Boot Support Enable or disable booting from USB mass storage devices such as external hard drive, optical drive, and USB drive. Enable External USB Port Enable or disable booting from USB mass storage devices connected to external USB port.
  • Page 62 Table 7. System setup options—Secure Boot menu Secure Boot Enable Custom Mode Enable or disable custom mode. Expert Key Management Enable or disable Expert Key Management. Custom Mode Key Management Select the custom values for expert key management. Table 8. System setup options—Intel Software Guard Extensions menu (continued) Intel Software Guard Extensions Intel SGX Enable Enable or disable Intel Software Guard Extensions.
  • Page 63 SupportAssist System Resolution Auto OS Recovery Threshold Control the automatic boot flow for SupportAssist System Resolution Console and for the Dell OS Recovery tool. SupportAssist OS Recovery Enable or disable the boot flow for the SupportAssist OS Recovery tool when certain system errors.

  • Page 64: Clearing Cmos Settings

    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 or your application.

  • Page 65: Chapter 5: Troubleshooting

    Locate the Service Tag or Express Service Code of your Dell computer Your Dell computer is uniquely identified by a Service Tag or Express Service Code. To view relevant support resources for your Dell computer, we recommend entering the Service Tag or Express Service Code at www.dell.com/support.

  • Page 66: Diagnostics

    BIOS recovery image found but invalid Power rail failure Paid SPI volume error Intel ME (Management Engine) error Recovering the operating system When your computer is unable to boot to the operating system even after repeated attempts, it automatically starts Dell SupportAssist OS Recovery. Troubleshooting...

  • Page 67: Flashing Bios (Usb Key)

    It enables you to diagnose hardware issues, repair your computer, back up your files, or 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 their primary operating system due to software or hardware failures.

  • Page 68: Flea Power Release

    Steps 1. Turn off your computer. 2. Turn off the modem. 3. Turn off the wireless router. 4. Wait for 30 seconds. 5. Turn on the wireless router. 6. Turn on the modem. 7. Turn on your computer. Flea power release About this task Flea power is the residual static electricity that remains on the computer even after it has been powered off and the battery has been removed.

  • Page 69: Chapter 6: 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 16. Self-help resources Self-help resources Resource location Information about Dell products and services www.dell.com My Dell app...

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Inspiron 27-7700W23c002Inspiron 7700

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