Dell Vostro 3681 Service Manual
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Dell Vostro 3681 Service Manual

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Vostro 3681
Service Manual
1
Regulatory Model: D15S
Regulatory Type: D15S002
May 2020
Rev. A00

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Summary of Contents for Dell Vostro 3681

  • Page 1 Vostro 3681 Service Manual Regulatory Model: D15S Regulatory Type: D15S002 May 2020 Rev. A00...
  • Page 2 A WARNING indicates a potential for property damage, personal injury, or death. © 2020 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 1 Working on your computer......................5 Safety instructions................................5 Before working inside your computer........................... 5 Safety precautions................................6 Electrostatic discharge—ESD protection........................6 ESD field service kit ................................ 7 Transporting sensitive components..........................7 After working inside your computer..........................8 2 Technology and components......................9 DDR4.......................................
  • Page 4 Real-Time Clock (RTC Reset)............................57 System diagnostic lights..............................57 Diagnostic error messages..............................58 System error messages............................... 61 Recovering the operating system............................61 Flashing BIOS (USB key)..............................62 Flashing the BIOS................................62 WiFi power cycle................................. 62 5 Getting help and contacting Dell....................63 Contents...

  • Page 5: Working On Your Computer

    Damage due to servicing that is not authorized by Dell is not covered by your warranty. Read and follow the safety instructions that came with the product.

  • Page 6: Safety Precautions

    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 For this reason, some previously approved methods of handling parts are no longer applicable.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 7: Esd Field Service Kit

    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.

  • Page 8: After Working Inside Your Computer

    CAUTION: Do not lift greater than 50 pounds. Always obtain additional resources or use a mechanical lifting device. 1. Get a firm balanced footing. Keep your feet apart for a stable base, and point your toes out. 2. Tighten stomach muscles. Abdominal muscles support your spine when you lift, offsetting the force of the load. 3.

  • Page 9: Technology And Components

    Technology and components This chapter details the technology and components available in the system. DDR4 DDR4 (double data rate fourth generation) memory is a higher-speed successor to the DDR2 and DDR3 technologies and allows up to 512 GB in capacity, compared to the DDR3's maximum of 128 GB per DIMM. DDR4 synchronous dynamic random-access memory is keyed differently from both SDRAM and DDR to prevent the user from installing the wrong type of memory into the system.

  • Page 10: Usb Features

    Figure 3. Curved edge Memory Errors Memory errors on the system display 2,3 failure code. If all memory fails, the LCD does not turn on. Troubleshoot for possible memory failure by trying known good memory modules in the memory connectors on the bottom of the system or under the keyboard, as in some portable systems.
  • Page 11 • An additional physical bus that is added in parallel with the existing USB 2.0 bus (refer to the picture below). • USB 2.0 previously had four wires (power, ground, and a pair for differential data); USB 3.0/USB 3.1 Gen 1 adds four more for two pairs of differential signals (receive and transmit) for a combined total of eight connections in the connectors and cabling.

  • Page 12: Hdmi 1.4B

    HDMI 1.4b This topic explains the HDMI 1.4b and its features along with the advantages. HDMI (High-Definition Multimedia Interface) is an industry-supported, uncompressed, all-digital audio/video interface. HDMI provides an interface between any compatible digital audio/video source, such as a DVD player, or A/V receiver and a compatible digital audio and/or video monitor, such as a digital TV (DTV).

  • Page 13: Disassembly And Reassembly

    Disassembly and reassembly Recommended tools The procedures in this document require the following tools: • Small flat blade screwdriver • Phillips # 1 screwdriver • Small plastic scribe • Hex screwdriver Screw size list Table 2. Screw size list 6-32X1/4" M2X4 M2x3 Component...

  • Page 14: System Board Layout

    System board layout This section illustrates the system board and calls out the ports and connectors. 1. ATX Power connector (ATX_CPU1 and ATX_CPU2) 2. CPU fan connector (Fan_CPU) 3. Memory-module slots (DIMM1, DIMM2) 4. M.2 2230/2280 connector (for SSD) 5. Power switch connector (PWR_SW) 6.
  • Page 15 About this task The following images indicate the location of the side cover and provide a visual representation of the removal procedure: Steps 1. Loosen the two captive screws and slide the side cover to release it from the chassis. 2.

  • Page 16: Installing The Side Cover

    Installing the side cover Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure: About this task The following images indicate the location of the side cover and provide a visual representation of the installation procedure: Disassembly and reassembly...

  • Page 17: Bezel

    Steps 1. Align the tabs on the side cover with the slots and replace the side cover on the chassis. 2. Slide the side cover towards the front of the unit and tighten the two cap screws to secure the side cover to the chassis. Next steps 1.

  • Page 18: Installing The Front Bezel

    Installing the front bezel Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. • Place the computer in an upright position. About this task The following images indicate the location of the front bezel and provide a visual representation of the installation procedure: Steps 1.

  • Page 19: 3.5 In. Hard Disk Drive

    3.5 in. Hard disk drive Removing the 3.5-inch hard drive Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the side cover. About this task The following images indicate the location of the 3.5-inch hard drive and provides a visual representation of the removal procedure: Steps 1.

  • Page 20: Hdd/Odd Bracket

    About this task The following images indicate the location of the 3.5-inch hard drive and provides a visual representation of the installation procedure: Steps 1. Place the hard drive into the hard-drive bracket and align the tabs on the bracket with the slots on the hard drive. 2.
  • Page 21 Disassembly and reassembly...

  • Page 22: Installing The Hdd/Odd Bracket

    Steps 1. Release the ODD power and SATA cables from tabs on the side of the ODD bracket. 2. Remove the single #6-32 screw securing the ODD bracket to the chassis. 3. Lift the ODD bracket from the chassis. 4. Push the ODD to unlock it. 5.
  • Page 23 Disassembly and reassembly...

  • Page 24: Optical Drive

    Steps 1. Align and place the ODD bracket on the system unit chassis and connect the ODD SATA and power connectors 2. Push the ODD bracket into the chassis. 3. Snap the ODD bracket aligning the holes on the ODD bracket with that on the chassis. 4.
  • Page 25 2. Remove the side cover. 3. Remove the 3.5 in. HDD. 4. Remove the HDD/ODD bracket. About this task The following images indicate the location of the ODD and provides a visual representation of the removal procedure. Steps 1. Remove the single M2x3 screw securing the optical drive to the bracket. 2.

  • Page 26: Installing The Optical Disk Drive

    Installing the Optical Disk Drive Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following images indicate the location of the Optical Disk Drive and provide a visual representation of the installation procedure: Steps 1.

  • Page 27: Memory Module

    Next steps 1. Install the HDD/ODD bracket. 2. Install the 3.5 in. HDD. 3. Install the side cover. 4. Follow the procedure in After working inside your computer. Memory module Removing the memory modules Prerequisites 1. Follow the procedure in Before working inside your computer.

  • Page 28: Installing The Memory Modules

    CAUTION: To prevent damage to the memory module, hold the memory module by the edges. Do not touch the components on the memory module. Installing the memory modules Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following images indicate the location of the memory modules and provides a visual representation of the installation procedure.

  • Page 29: Graphics Card

    Graphics card Removing the graphics card Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the side cover. About this task The following images indicate the location of the graphics card and provides a visual representation of the removal procedure. Steps 1.

  • Page 30: Installing The Graphics Card

    Installing the graphics card Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following images indicate the location of the graphics card and provides a visual representation of the installation procedure. Steps 1.

  • Page 31: Coin Cell Battery

    Coin cell battery Removing the coin-cell battery Prerequisites 1. Follow the procedure in Before working inside your computer. CAUTION: Removing the coin-cell battery resets the BIOS setup program’s settings to default. It is recommended that you note the BIOS setup program’s settings before removing the coin-cell battery. 2.

  • Page 32: M.2 2230 Solid State Drive

    Insert the coin-cell battery into the socket with the positive side (+) labeled facing up and snap the battery in the socket. Next steps 1. Install the side cover. 2. Follow the procedure in After working inside your computer. M.2 2230 Solid state drive Removing the 2230 solid-state drive Prerequisites 1.

  • Page 33: Installing The 2230 Solid-State Drive

    Steps 1. Remove the screw (M2x3) that secures the 2230 solid-state drive to the system board. 2. Slide and lift the solid-state drive from the M.2 card slot on the system board. Installing the 2230 solid-state drive Prerequisites CAUTION: Solid-state drives are fragile. Exercise care when handling the solid-state drive. If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 34: M.2 2280 Solid State Drive

    Steps 1. Locate the notch on the 2230 solid-state drive. 2. Align the notch on the 2230 solid-state drive with the tab on the M.2 card slot. 3. Slide the 2230 solid-state drive into the M.2 card slot on the system board. 4.

  • Page 35: Installing The 2280 Solid-State Drive

    Image: Steps 1. Remove the screw (M2x3) that secures the 2280 solid-state drive to the system board. 2. Slide and lift the solid-state drive from the M.2 card slot on the system board. Installing the 2280 solid-state drive Prerequisites CAUTION: Solid-state drives are fragile.

  • Page 36: Wlan Card

    Steps 1. Locate the notch on the 2280 solid-state drive. 2. Align the notch on the 2280 solid-state drive with the tab on the M.2 card slot. 3. Slide the 2230 solid-state drive into the M.2 card slot on the system board. 4.

  • Page 37: Installing The Wlan Card

    Steps 1. Remove the single (M2x3) screw that secures the wireless card to the system board. 2. Slide and lift the wireless-card bracket off the wireless card. 3. Disconnect the antenna cables from the wireless card. 4. Slide and remove the wireless card at an angle from the wireless-card slot. Installing the WLAN card Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.
  • Page 38 Steps 1. Connect the antenna cables to the WLAN card. The following table provides the antenna-cable color scheme for the wireless card supported by your computer. Table 3. Antenna-cable color scheme Connectors on the wireless card Antenna-cable color Main (white triangle) White Auxiliary (black triangle) Black...

  • Page 39: Sd Card

    SD card Removing the media card reader Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the side cover. 3. Remove the front bezel. 4. Remove the HDD/ODD bracket. About this task The following images indicate the location of the front cover and provide a visual representation of the removal procedure. Steps 1.

  • Page 40: Power Supply Unit

    Steps 1. Place the SD card reader on the system board ensuring the SD card reader sits flush on the connector on the system board. 2. Replace the two M3x5 screws securing the SD card reader to the system board. 3.
  • Page 41 Disassembly and reassembly...

  • Page 42: Installing The Power-Supply Unit

    Steps 1. Lay the computer on the right side. 2. Disconnect the power cables from the system board and remove them from the routing guides on the chassis. 3. Remove the three (#6-32) screws that secure the power-supply unit to the chassis. 4.
  • Page 43 Disassembly and reassembly...
  • Page 44 Disassembly and reassembly...

  • Page 45: Heatsink Assembly

    Steps 1. Slide the power-supply unit into the chassis until the securing tab snaps into position. 2. Replace the three screws (#6-32) that secure the power-supply unit to the chassis. 3. Route the power cable through the routing guides on the chassis and connect the power cables to their respective connectors on the system board.

  • Page 46: Installing The Heatsink Assembly

    Steps 1. Insert a flat head screw driver along the four marked edges of the fan shroud and gently push towards the fan to disengage the fan shroud from the heatsink assembly. 2. Lift and remove the fan shroud from the system unit. 3.

  • Page 47: Processor

    Steps 1. Align the screw holes on the processor fan and heat-sink assembly with the screw holes on the system board. 2. In the sequential order (1->2->3->4), tighten the captive screws that secure the processor fan and heat-sink assembly to the system board.
  • Page 48 3. Remove the heatsink assembly. NOTE: The processor might still be hot after the computer is shut down. Allow the processor to cool down before removing it. About this task The following images indicate the location of the processor and provides a visual representation of the removal procedure: Steps 1.

  • Page 49: Installing The Processor

    Installing the processor Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following images indicate the location of the processor and provides a visual representation of the installation procedure: Steps 1.

  • Page 50: System Board

    Next steps 1. Install the heatsink assembly. 2. Install the side cover. 3. Follow the procedure in After working inside your computer. System board Removing the system board Prerequisites 1. Follow the procedure in Before working inside your computer. NOTE: Your computer’s Service Tag is stored in the system board.
  • Page 51 Disassembly and reassembly...
  • Page 52 Disassembly and reassembly...

  • Page 53: Installing The System Board

    Steps 1. Lay the computer on the right side. 2. Remove the screw (#6-32) that secures the front I/O-bracket to the chassis and remove the front I/O-bracket. 3. Disconnect the 4-pin power supply ATEX connector from the system board. 4. Disconnect the 6-pin power supply ATEX connector from the system board. 5.
  • Page 54 Disassembly and reassembly...
  • Page 55 Steps 1. Slide the front I/O-ports on the system board into the front I/O-slots on the chassis and align the screw holes on the system board with the screw holes on the chassis. 2. Align the front I/O-bracket with the slots on the chassis. 3.
  • Page 56 8. Install the HDD/ODD Bracket. 9. Install the front bezel. 10. Install the side cover. 11. 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.

  • Page 57: Troubleshooting

    Real-Time Clock (RTC Reset) The Real Time Clock (RTC) reset function allows you or the service technician to recover Dell Inspiron, systems from No POST/No Power/No Boot situations. The legacy jumper enabled RTC reset has been retired on these models.

  • Page 58: Diagnostic Error Messages

    One or more memory modules may be faulty or improperly seated. Reinstall the memory modules or, if necessary, replace them. DISK C: FAILED INITIALIZATION The hard drive failed initialization. Run the hard drive tests in Dell Diagnostics. DRIVE NOT READY The operation requires a hard drive in the bay before it can continue.
  • Page 59 Shut down the computer, remove the hard drive, and boot the computer from an optical drive. Then, shut down the computer, reinstall the hard drive, and restart the computer. If the problem persists, try another drive. Run the Hard Disk Drive tests in Dell Diagnostics. HARD-DISK DRIVE FAILURE The hard drive does not respond to commands from the computer.
  • Page 60 The operating system cannot find a specific track on the hard drive. SHUTDOWN FAILURE A chip on the system board may be malfunctioning. Run the System Set tests in Dell Diagnostics. If the message reappears, Contact Dell. TIME-OF-DAY CLOCK LOST POWER System configuration settings are corrupted. Connect your computer to an electrical outlet to charge the battery.

  • Page 61: System Error Messages

    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 62: Flashing Bios (Usb Key)

    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. Boot to the USB drive from the One Time Boot Menu.

  • Page 63: 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 8. Self-help resources Self-help resources Resource location Information about Dell products and services https://www.dell.com/ Dell Support Tips Contact Support In Windows search, type Contact Support, and press Enter.
  • Page 64 Dell product catalog. Availability varies by country/region and product, and some services may not be available in your area. To contact Dell for sales, technical support, or customer service issues: 1.

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