Inspiron 24-5491 Service Manual Regulatory Model: W24C Regulatory Type: W24C001
Notes, cautions, and warnings NOTE: A NOTE indicates important information that helps you make better use of your product. CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the problem. WARNING: A WARNING indicates a potential for property damage, personal injury, or death. © 2019 Dell Inc. or its subsidiaries. All rights reserved. Dell, EMC, and other trademarks are trademarks of Dell Inc. or its subsidiaries.
Contents 1 Safety instructions....................................................................................................................... 6 Before working inside your computer................................................................................................................................. 6 Before you begin .............................................................................................................................................................
Installing the media-card reader.................................................................................................................................. 32 Speakers............................................................................................................................................................................... 33 Removing the speakers..........................................................................................................................................
Display built-in self test.......................................................................................................................................................68 Diagnostics........................................................................................................................................................................... 69 Recovering the operating system...................................................................................................................
1 Safety instructions Use the following safety guidelines to protect your computer from potential damage and ensure your personal safety. NOTE: Before working inside your computer, read the safety information that shipped with your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/regulatory_compliance. NOTE: Disconnect all power sources before opening the computer cover or panels.
5. Remove any media card and optical disc from your computer, if applicable. 6. After the computer is unplugged, press and hold the power button for 5 seconds to ground the system board. CAUTION: Place the computer on a flat, soft, and clean surface to avoid scratches on the display. 7. Place the computer face down.
• • • • Insulator Elements – It is critical to keep ESD sensitive devices, such as plastic heat sink casings, away from internal parts that are insulators and often highly charged. Working Environment – Before deploying the ESD Field Service kit, assess the situation at the customer location. For example, deploying the kit for a server environment is different than for a desktop or portable environment.
2 Removing and installing components Inside view of your computer NOTE: The appearance of heat sink differs depending on the graphics configuration you ordered. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16.
Screw list NOTE: When removing screws from a component, it is recommended to note the screw type, 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. NOTE: Some computers have magnetic surfaces. Ensure that the screws are not left attached to such surface when replacing a component. NOTE: Screw color may vary with the configuration ordered. Table 1.
Component Secured to Screw type Quantity Base panel Display-assembly base M3x5 19 Display panel Display-assembly base M3 0.5x5 11 Media-card reader Display-assembly base M2x3 1 Screw image 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.
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. Next steps 1. Follow the procedure in After working inside your computer.
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.
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. Install the back cover. 2. Follow the procedure in After working inside your computer. Stand Removing the stand Prerequisites 1. Follow the procedure in Before working inside your computer.
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.
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. Next steps 1. Install the bottom cover. 2. Install the back cover. 3. Follow the procedure in After working inside your computer. Hard drive Removing the hard drive Prerequisites 1. 2. 3. 4.
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. Remove the hard-drive bracket off the hard drive. Installing the hard drive Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.
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. Replace the two screws (M3x5) that secures the hard-drive assembly to the display-assembly base. Next steps 1. 2. 3. 4. Install the stand. Install the bottom cover. Install the back cover.
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.
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. 2. 3. 4. Install the stand. Install the bottom cover. Install the back cover. Follow the procedure in After working inside your computer. Memory modules Removing the memory modules Prerequisites 1. 2. 3. 4. 5. Follow the procedure in Before working inside your computer. Remove the back cover.
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.
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 step 1 and 2 if there are two memory modules. Next steps 1. 2. 3. 4. 5. Install the system-board shield. Install the stand. Install the bottom cover. Install the back cover.
Steps 1. Using your fingertip, 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 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.
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. 2. 3. 4. 5. Install the system-board shield. Install the stand. Install the bottom cover. Install the back cover. Follow the procedure in After working inside your computer. Heat sink Removing the heat sink Prerequisites 1. 2. 3. 4. 5. Follow the procedure in Before working inside your computer. Remove the back cover. Remove the bottom cover.
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.
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. Next steps 1. 2. 3. 4. 5. Install the system-board shield. Install the stand. Install the bottom cover. Install the back cover. Follow the procedure in After working inside your computer.
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. Slide the wireless-card bracket off 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. About this task The following image indicates the location of the wireless card and provides a visual representation of the installation procedure.
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 2. Place the wireless-card bracket on the wireless card. 3. Align the notch on the wireless card with the tab on the wireless-card slot. 4.
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.
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. 2. 3. 4. 5. Install the system-board shield. Install the stand. Install the bottom cover. Install the back cover. Follow the procedure in After working inside your computer. Media-card reader Removing the media-card reader Prerequisites 1. 2. 3. 4.
Steps 1. Remove the screw (M2x3) that secure the media-card reader to the display-assembly base. 2. Open the latch and disconnect the media-card reader cable from the system board. 3. Remove the media-card reader from the slot on the media-card reader slot. Installing the media-card reader Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.
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. Replace the screw (M2x3) that secure the media-card reader to the display-assembly base. Next steps 1. 2. 3. 4. 5. Install the system-board shield. Install the stand. Install the bottom cover. Install the back cover.
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. Lift the speakers along with the cable off the display-assembly base.
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. Route the speaker cable through the routing guide on display-assembly base and connect the speaker cable to the system board. Next steps 1. 2. 3. 4. 5. Install the system-board shield. Install the stand. Install the bottom cover.
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. 3. Lift the microphone modules (2) off the slots on the base panel.
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. 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. 2. 3. 4. 5. 6. Install the speakers. Install the system-board shield. Install the stand.
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. Remove the fan cable from the routing guides on the display-assembly base. 3. Remove the three screws (M2x2.5) that secure the fan to the display-assembly base. 4. Lift the fan, along with its cable, off the display-assembly base.
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. Connect the fan cable to the system board. Next steps 1. 2. 3. 4. 5. Install the system-board shield. Install the stand. Install the bottom cover. Install the back cover. Follow the procedure in After working inside your computer.
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. Remove the two screws (M2x2.5) that secure the antenna modules (2) to the base panel. 3. Carefully peel the copper foil that secures the antenna cables (2) to the base panel. 4.
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. Replace the two screws (M2x2.5) that secure the antenna modules (2) to the base panel. 4. Route the antenna cables through the routing guides on the display-assembly base. Next steps 1. 2. 3. 4. 5. 6. 7.
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. Remove the two screws (M3x5) that secure the retractable-camera assembly to the base panel. 4. Remove the retractable-camera assembly door from the base panel.
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. Connect the camera cable to the system board. Next steps 1. 2. 3. 4. 5. Install the system-board shield. Install the stand. Install the bottom cover. Install the back cover. Follow the procedure in After working inside your computer.
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. Installing the power-button board Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.
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. 2. 3. 4. 5. 6. Install the speakers. Install the system-board shield. Install the stand. Install the bottom cover. Install the back cover. Follow the procedure in After working inside your computer. System board Removing the system board Prerequisites 1.
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. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13.
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. Disconnect the media-card reader cable from the system board. 6. Disconnect the microphone-module cable from the system board. 7. Disconnect the fan cable from the system board. 8. Disconnect the touchscreen cable from the system board. 9.
About this task The following image indicates the connectors on your system board. Figure 2. System-board connectors 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Memory module Camera cable Touchscreen cable Debug port Coin-cell battery Fan cable Microphones cable Media-card reader cable Speaker cable Power-button board cable Display cable Hard-drive connector Backlit cable The following image indicates the location of system board and provides a visual representation of the installation procedure.
Steps 1. Align the screw holes on the system board with the screw holes on the display-assembly base. 2. Replace the six screws (M3x5) that secure the system board to the display-assembly base. 3. Connect the camera cable to the system board. 4. Connect the touchscreen cable to the system board. 5. Connect the fan cable to the system board. 6. Connect the microphone-module cable to the system board. 7. Connect the media-card reader cable to the system board. 8. Connect the speaker cable to the system board.
5. 6. 7. 8. 9. Install the system-board shield. Install the stand. Install the bottom cover. Install the back cover. 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 you have made to the BIOS using the BIOS setup program.
Removing and installing components 51
Steps 1. Remove the 19 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.
Steps 1. Align the screw holes on the base panel with the screw holes on the display-assembly base. 2. Replace the 19 screws (M3x5) that secures the base panel to the display-assembly base. Next steps 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. Install the display panel. Install the system board. Install the microphones. Install the camera. Install the power-button board. Install the solid-state drive. Install the speakers. Install the wireless card. Install the antennas.
Display panel Removing the display panel Prerequisites 1. 2. 3. 4. 5. 6. Follow the procedure in Before working inside your computer. Remove the back cover. Remove the bottom cover. Remove the hard drive. Remove the system-board shield. 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.
Steps 1. Remove the 11 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 displayassembly base. 4. Route the display back-light, touch screen and display cable though the slots on the display assembly base. 5. Lift the display panel up from the display-assembly base.
Removing and installing components
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. Replace the 10 screws (M3x5) that secure the display panel to the display-assembly base.
NOTE: The screws that secure the middle frame and display panel to the display-assembly base are silver in color and etched with "LCD" around the screw holes. 5. Remove the jig screw from the display panel. 6. Replace the screw (M3x5) that secure the display panel to the display-assembly base. Next steps 1. 2. 3. 4. 5. 6. 58 Install the system board. Install the system-board shield. Install the hard drive. Install the bottom cover. Install the back cover.
3 Device 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. Install the video driver update from www.dell.com/support. Intel Serial IO driver In the Device Manager, check if the Intel Serial IO driver is installed. Install the driver updates from www.dell.com/support.
4 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 Clearing CMOS settings Clearing forgotten passwords System setup CAUTION: Unless you are an expert computer user, do not change the settings in the BIOS Setup program. Certain changes can make your computer work incorrectly.
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 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 option.
General-System Information Processor Type Displays the processor type. 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. Processor L2 Cache Displays the processor L2 Cache size. Processor L3 Cache Displays the processor L3 Cache size.
System Configuration USB 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. Rear USB Configuration Enable or disable rear USB configuration. USB PowerShare Enable or Disable USB PowerShare Audio Enable or disable the integrated audio controller.
Secure Boot 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 Intel Software Guard Extensions Intel SGX Enable Enable or disable Intel Software Guard Extensions. Enclave Memory Size Set the Intel Software Guard Extensions Enclave Reserve Memory Size. Performance Multi Core Support Enable multiple cores. Default: Enabled.
Intel Software Guard Extensions Fastboot Enable to set the speed of the boot process. Default: Thorough. Extend BIOS POST Time Set the BIOS POST time. Full Screen Logo Enable or disable full screen logo Warning and Errors Enable or disable the action to be done when a warning or error is encountered. Table 9.
About this task The following image indicates the location of the CMOS jumper-pins and provides a visual representation of the removal procedure. Steps 1. Remove the jumper plug from the password jumper-pins and connect it to the CMOS jumper-pins. 2. Wait for 5 seconds and then replace the jumper plug in its original location. Next steps 1. 2. 3. 4. Install the system-board shield. Install the stand. Install the bottom cover. Install the back cover. Clearing forgotten passwords Prerequisites 1. 2. 3. 4.
Steps 1. Remove the jumper plug from the password jumper-pins. 2. Wait for 5 seconds and then replace the jumper plug in its original location. Next steps 1. 2. 3. 4. Install the system-board shield. Install the stand. Install the bottom cover. Install the back cover.
5 Troubleshooting Enhanced Pre-Boot System Assessment (ePSA) diagnostics About this task The ePSA diagnostics (also known as system diagnostics) performs a complete check of your hardware. The ePSA is embedded with the BIOS and is launched by the BIOS internally.
5. Hold the display built-in self test button until the test starts. Diagnostics Power status light: Indicates the power status. Solid Amber – The computer is unable to boot to the operating system. This indicates that the power supply or another device in the computer is failing. Blinking Amber – The computer is unable to boot to the operating system. This indicates that the power supply is normal but another device in the computer is failing or not installed properly.
Flashing BIOS (USB key) Steps 1. Follow the procedure from step 1 to step 7 in "Flashing the BIOS" to download the latest BIOS setup program file. 2. Create a bootable USB drive. For more information see the knowledge base article SLN143196 at www.dell.com/support. 3. Copy the BIOS setup program file to the bootable USB drive. 4. Connect the bootable USB drive to the computer that needs the BIOS update. 5. Restart the computer and press F12 when the Dell logo is displayed on the screen. 6.
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. The following procedure provides the instructions on how to conduct flea power release: Steps 1. Turn off your computer. 2. Disconnect the power adapter from your computer. 3. Press and hold the power button for 15 seconds to drain the flea power. 4. Connect the power adapter to your computer. 5. Turn on your computer.
6 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 15. Self-help resources Self-help resources Resource location Information about Dell products and services www.dell.com My Dell app Tips Contact Support In Windows search, type Contact Support, and press Enter. Online help for operating system www.dell.
