Dell Inspiron 3668 Service Manual
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Dell Inspiron 3668 Service Manual

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See also: Setup and Specifications
Inspiron 3668
Service Manual
Computer Model: Inspiron 3668
Regulatory Model: D19M
Regulatory Type: D19M003

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Summary of Contents for Dell Inspiron 3668

  • Page 1 Inspiron 3668 Service Manual Computer Model: Inspiron 3668 Regulatory Model: D19M Regulatory Type: D19M003...
  • Page 2 WARNING: A WARNING indicates a potential for property damage, personal injury, or death. Copyright © 2017 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 Before working inside your computer......9 ..................9 Before you begin After working inside your computer......10 Safety instructions............11 Recommended tools.............13 Screw list..............14 Inside view of your computer........15 System board components...........16 Removing the computer cover ........18 ....................
  • Page 4 Removing the memory modules........24 ................... 24 Prerequisites ....................24 Procedure Replacing the memory modules........27 ....................27 Procedure ..................28 Post-requisites Removing the graphics card........29 ................... 29 Prerequisites ....................29 Procedure Replacing the graphics card.........33 ....................33 Procedure ..................
  • Page 5 Removing the optical drive.......... 45 ................... 45 Prerequisites ....................45 Procedure Replacing the optical drive.......... 50 ....................50 Procedure ..................50 Post-requisites Removing the coin-cell battery........51 ....................51 Prerequisites ....................51 Procedure Replacing the coin-cell battery........54 ....................54 Procedure ..................54 Post-requisites Removing the wireless card.........
  • Page 6 Removing the power-button module......64 ................... 64 Prerequisites ....................64 Procedure Replacing the power-button module......67 ....................67 Procedure ..................67 Post-requisites Removing the chassis fan..........68 ................... 68 Prerequisites ....................68 Procedure Replacing the chassis fan..........71 ....................71 Procedure ..................71 Post-requisites Removing the power-supply unit........72...
  • Page 7 Removing the processor heat-sink....... 81 .................... 81 Prerequisites ....................81 Procedure Replacing the processor heat-sink.......83 ....................83 Procedure ..................83 Post-requisites Removing the system board........84 ................... 84 Prerequisites ....................84 Procedure Replacing the system board.........87 ....................87 Procedure ..................87 Post-requisites BIOS setup program............
  • Page 8 Getting help and contacting Dell........95 ................. 95 Self-help resources ..................95 Contacting Dell...

  • Page 9: Before Working Inside Your Computer

    Before working inside your computer NOTE: The images in this document may differ from your computer depending on the configuration you ordered. Before you begin Save and close all open files and exit all open applications. Shut down your computer. Click Start → Power →...

  • Page 10: After Working Inside Your Computer

    After working inside your computer CAUTION: Leaving stray or loose screws inside your computer may severely damage your computer. Replace all screws and ensure that no stray screws remain inside your computer. Connect any external devices, peripherals, or cables you removed before working on your computer.

  • Page 11: Safety Instructions

    CAUTION: You should only perform troubleshooting and repairs as authorized or directed by the Dell technical assistance team. Damage due to servicing that is not authorized by Dell is not covered by your warranty. See the safety instructions that shipped with the product or at www.dell.com/...

  • Page 13: Recommended Tools

    Recommended tools The procedures in this document may require the following tools: • Phillips screwdriver • Plastic scribe...

  • Page 14: Screw List

    Screw list The following table provides the list of screws that are used for securing different components to the computer. Table 1. Screw list Component Secured to Screw type Quantity Computer cover Chassis #6-32xL6.35 Chassis fan Chassis #6-32xL6.35 3.5-inch hard drive Side-chassis #6-32xL6.35 3.5-inch hard drive Hard-drive bracket #6-32xL3.6 Optical drive...

  • Page 15: Inside View Of Your Computer

    Inside view of your computer system board graphics card (PCIe x 16) processor fan and heat-sink memory module assembly optical drive 3.5-inch hard-drive assembly 2.5-inch hard-drive assembly side-chassis wireless card power-supply unit...

  • Page 16: System Board Components

    System board components power-button cable connector optical drive power-cable connector SATA 1 connector SATA 0 connector SATA 2 connector SATA 3 connector wireless-card slot hard drive power-cable connector power-supply unit cable connector coin-cell battery...
  • Page 17 CMOS jumper password jumper service-mode jumper graphics-card slot PCIe x1 PCIe x1 chassis fan cable connector processor socket processor-fan cable connector power-supply unit cable connector memory-module slots (2)

  • Page 18: Removing The Computer Cover

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Remove the two screws (#6-32xL6.35) that secure the cover to the chassis. Release the computer cover by sliding it towards the back of the computer, lift...

  • Page 19: Replacing The Computer Cover

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Align the tabs on the computer cover with the slots on the chassis and slide it towards the front of the computer.

  • Page 20: Removing The Front Bezel

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the computer cover.

  • Page 21: Procedure

    Procedure Grasp and release the front bezel tabs sequentially from the top, by moving them outward from the chassis.
  • Page 22 Rotate and pull the front bezel away from the front of the computer to release the front bezel tabs from the front panel slots.

  • Page 23: Replacing The Front Bezel

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Align and insert the front bezel tabs into the front panel slots. Rotate the front bezel towards the chassis until the front-bezel tabs snap into place.

  • Page 24: Removing The Memory Modules

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the computer cover. Remove the front bezel.
  • Page 25 Lift and rotate the side-chassis away from the computer. CAUTION: To prevent damage to the memory module, hold the memory module by the edges. Do not touch the components on the memory module. Using the fingertips, spread apart the securing clip at each end of the memory- module slot until the memory module pops up.
  • Page 26 Lift the memory module out of the memory-module slot. NOTE: If the memory module is difficult to remove, gently ease the memory module back and forth to remove it from the slot.

  • Page 27: Replacing The Memory Modules

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Ensure that the securing clips are extended away from the memory-module slot. Align the notch on the memory module with the tab on the memory-module slot.

  • Page 28: Post-Requisites

    Insert the memory module into the memory-module slot and press the memory module down until it snaps into position and the securing clips lock in place. Rotate the side-chassis towards the computer until it snaps into place. Place the computer in an upright position. Post-requisites Replace the front...

  • Page 29: Removing The Graphics Card

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the computer cover. Remove the front bezel.
  • Page 30 Lift and rotate the side-chassis away from the computer.
  • Page 31 Lift the tab to open the card-retention bracket. Push the securing tab on the PCIe slot away from the graphics card.
  • Page 32 Grasp the card by its top corner and lift it out of the slot.

  • Page 33: Replacing The Graphics Card

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Align the graphics card with the slot on the system board. Place the card into the slot and press down firmly until the graphics card snaps into place.

  • Page 34: Removing The 3.5-Inch Hard Drive

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the computer cover. Remove the front bezel.
  • Page 35 Disconnect the power cable from the hard drive.
  • Page 36 Lift and rotate the side-chassis away from the computer.
  • Page 37 Using the release tabs on the hard-drive assembly, slide the hard-drive assembly out of the slot on the side-chassis. Remove the four screws (#6-32xL3.6) that secure the hard-drive bracket to the hard drive.
  • Page 38 Lift the hard drive off the hard-drive bracket.

  • Page 39: Replacing The 3.5-Inch Hard Drive

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Place the hard drive in the hard-drive bracket. Align the screw holes on the hard drive with the screw holes on the hard-drive bracket.

  • Page 40: Removing The 2.5-Inch Hard Drives

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the computer cover. Remove the front bezel.
  • Page 41 Lift and rotate the side-chassis away from the computer. Disconnect the power cable from the hard drive. Disconnect the data cable from the hard drive. Press the release tabs on the hard-drive assembly.
  • Page 42 Slide the hard-drive assembly out of the slot on the side-chassis. Pry the hard-drive bracket to release the tabs on the bracket from the slots on the hard drive.
  • Page 43 Lift the hard drive off the hard-drive bracket. NOTE: Note the orientation of the hard drive so that you can replace it correctly.

  • Page 44: Replacing The 2.5-Inch Hard Drives

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Place the hard drive into the hard-drive bracket and align the tabs on the bracket with the slots on the hard drive.

  • Page 45: Removing The Optical Drive

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the computer cover. Remove the front bezel.
  • Page 46 Lift and rotate the side-chassis away from the computer. Disconnect the power cable from the optical drive.
  • Page 47 Disconnect the data cable from the optical drive. Rotate the side-chassis towards the computer until it snaps into place. Remove the screw (#6-32xL3.6) that secures the optical-drive assembly to the side-chassis.
  • Page 48 Gently slide the optical-drive assembly out of the optical-drive bay through the front of the computer. Remove the three screws (M2xL2) that secure the optical-drive bracket to the optical drive.
  • Page 49 Lift the optical-drive bracket off the optical drive. 10 Gently pull and disconnect the optical-drive bezel from the optical drive.

  • Page 50: Replacing The Optical Drive

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Align and snap the optical-drive bezel to the optical drive. Align the screw holes on the optical-drive bracket with the screw holes on the optical drive.

  • Page 51: Removing The Coin-Cell Battery

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. 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.
  • Page 52 Lift and rotate the side-chassis away from the computer.
  • Page 53 Using a plastic scribe, pry the coin-cell battery out of its socket.

  • Page 54: Replacing The Coin-Cell Battery

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Insert a new coin-cell battery (CR2032) into the battery socket with the positive side facing up, and snap the battery into place.

  • Page 55: Removing The Wireless Card

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the computer cover. Remove the front bezel.
  • Page 56 Lift and rotate the side-chassis away from the computer. Remove the screw (M2xL3.5) that secures the wireless card to the system board. Lift the wireless-card bracket off the wireless card. Disconnect the antenna cables from the wireless card.
  • Page 57 Slide and remove the wireless card from the wireless-card slot.

  • Page 58: Replacing The Wireless Card

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Align the notch on the wireless card with the tab on the wireless-card slot. Slide the wireless card at an angle into the wireless-card slot.

  • Page 59: Post-Requisites

    Replace the screw (M2xL3.5) that secures the wireless card to the system board. Rotate the side-chassis towards the computer until it snaps into place. Place the computer in an upright position. Post-requisites Replace the front bezel. Replace the computer cover.

  • Page 60: Removing The Antenna Modules

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the computer cover. Remove the front bezel.
  • Page 61 Push down the antenna cables through the cable-routing slots on the side- chassis. Rotate the side-chassis towards the computer until it snaps into place. Note the antenna-cable routing and remove the antenna cables from the routing guides on the side-chassis.
  • Page 62 Using a plastic scribe, gently pry the antenna modules off the side-chassis.

  • Page 63: Replacing The Antenna Modules

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Adhere the antenna modules to the side-chassis. Route the antenna cables through the routing guides on the side-chassis.

  • Page 64: Removing The Power-Button Module

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the computer cover. Remove the front bezel.
  • Page 65 Lift and rotate the side-chassis away from the computer. Disconnect the power-button cable from the system board. Press the tabs on the power-button module to release the module from the front panel.
  • Page 66 Remove the power-button module along with its cable through the slot on the front panel.

  • Page 67: Replacing The Power-Button Module

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Route the power-button board cable through the slot on the front panel. Align and snap the power-button module into the slot on the front panel.

  • Page 68: Removing The Chassis Fan

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the computer cover. Remove the front bezel.
  • Page 69 Lift and rotate the side-chassis away from the computer. Disconnect the chassis-fan cable from the system board. Remove the four screws (#6-32xL6.35) that secure the chassis fan to the chassis.
  • Page 70 Remove the chassis fan from the chassis.

  • Page 71: Replacing The Chassis Fan

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Align the screw holes on the chassis fan with the screw holes on the chassis. Replace the four screws (#6-32xL6.35) that secure the chassis fan to the chassis.

  • Page 72: Removing The Power-Supply Unit

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the computer cover. Remove the front bezel.
  • Page 73 Lift and rotate the side-chassis away from the computer. Press the securing clip and disconnect the power-supply unit cable (ATX2) from the system board. Press the securing clip and disconnect the power-supply unit cable (ATX1) from the system board.
  • Page 74 Note the power-supply unit cable routing and remove the power-supply unit cable from the routing guides on the chassis. Remove the three screws (#6-32xL6.35) that secure the power-supply unit to the chassis. Press the clamp and slide the power-supply unit towards the front of the chassis to release it from the chassis.
  • Page 75 Lift the power-supply unit, along with the cables, off the chassis.

  • Page 76: Replacing The Power-Supply Unit

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Place the power-supply unit on the chassis. Slide the power-supply unit towards the back of the chassis until it snaps into place.

  • Page 77: Removing The Processor Fan

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the computer cover. Remove the front bezel.
  • Page 78 Lift and rotate the side-chassis away from the computer. Disconnect the processor-fan cable from the system board. Remove the four screws (M6xL10) that secure the processor fan to the heat sink.
  • Page 79 Lift the processor fan off the heat sink.

  • Page 80: Replacing The Processor Fan

    After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Align the screw holes on the processor fan with the screw holes on the heat sink.

  • Page 81: Removing The Processor Heat-Sink

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. CAUTION: For maximum cooling of the processor, do not touch the heat transfer areas on the heat sink. The oils in your skin can reduce the heat transfer capability of the thermal grease.
  • Page 82 Lift the heat-sink assembly off the system board.

  • Page 83: Replacing The Processor Heat-Sink

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. CAUTION: For maximum cooling of the processor, do not touch the heat transfer areas on the heat sink. The oils in your skin can reduce the heat transfer capability of the thermal grease.

  • Page 84: Removing The System Board

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. 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 85 Disconnect the power-button cable from the system board. Disconnect the optical-drive power cable from the system board. Disconnect the hard-drive power cable and power-supply unit cable from the system board. Disconnect the optical-drive and hard-drive data cables from the system board. Remove the eight screws (#6-32xL6.35) that secure the system board to the chassis.
  • Page 86 Lift the system board and remove it from the chassis.

  • Page 87: Replacing The System Board

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. 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 88: Bios Setup Program

    Entering BIOS setup program Turn on (or restart) your computer. During POST, when the DELL logo is displayed, watch for the F2 prompt to appear, and then press F2 immediately. NOTE: The F2 prompt indicates that the keyboard is initialized. This prompt can appear very quickly, so you must watch for it, and then press F2.
  • Page 89 Lift and rotate the side-chassis away from the computer. Locate the password jumper on the system board. NOTE: For more information on the location of the jumper, see System-board components. Remove the jumper plug from the password jumper-pins.

  • Page 90: Post-Requisites

    Wait for 5 seconds and then replace the jumper plug in its original location. Rotate the side-chassis towards the computer until it snaps into place. Post-requisites Replace the front bezel. Replace the computer cover.

  • Page 91: Clearing Cmos Settings

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the computer cover. Remove the front bezel.
  • Page 92 Lift and rotate the side-chassis away from the computer. Locate the CMOS jumper on the system board. NOTE: For more information on the location of the jumper, see System-board components. Remove the jumper plug from the password jumper-pins (PSWD) and connect it to the CMOS jumper-pins.

  • Page 93: Post-Requisites

    Wait for 5 seconds and then replace the jumper plug to its original location. Rotate the side-chassis towards the computer until it snaps into place. Post-requisites Replace the front bezel. Replace the computer cover.

  • Page 94: Flashing The Bios

    You may need to flash (update) the BIOS when an update is available or when you replace the system board. To flash the BIOS: Turn on your computer. Go to www.dell.com/support. Click Product support, enter the Service Tag of your computer, and then click Submit.

  • Page 95: 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 2. Self-help resources Information about Dell products and www.dell.com services Dell Help & Support app Get started app...
  • Page 96 NOTE: Availability varies by country and product, and some services may not be available in your country. NOTE: If you do not have an active internet connection, you can find contact information on your purchase invoice, packing slip, bill, or Dell product catalog.

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