Dell Inspiron 3185 Service Manual
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Dell Inspiron 3185 Service Manual

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Inspiron 3185
Service Manual
Regulatory Model: P25T
Regulatory Type: P25T003
September 2020
Rev. A01

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Summary of Contents for Dell Inspiron 3185

  • Page 1 Inspiron 3185 Service Manual Regulatory Model: P25T Regulatory Type: P25T003 September 2020 Rev. A01...
  • Page 2 A WARNING indicates a potential for property damage, personal injury, or death. © 2018-2020 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 Chapter 1: Before working inside your computer................8 Before you begin .................................8 Safety instructions................................8 Recommended tools................................9 Screw list....................................9 Chapter 2: After working inside your computer................10 Chapter 3: Removing the base cover.................... 11 Procedure..................................... 11 Chapter 4: Replacing the base cover.................... 13 Procedure.....................................13 Chapter 5: Removing the battery....................
  • Page 4 Chapter 12: Replacing the hard drive................... 25 Procedure....................................25 Post-requisites...................................25 Chapter 13: Removing the I/O board....................26 Prerequisites..................................26 Procedure....................................26 Chapter 14: Replacing the I/O board....................28 Procedure....................................28 Post-requisites................................... 28 Chapter 15: Removing the wireless card..................29 Prerequisites..................................29 Procedure....................................29 Chapter 16: Replacing the wireless card..................31 Procedure.....................................31 Post-requisites...................................
  • Page 5 Chapter 24: Replacing the memory module..................43 Procedure....................................43 Post-requisites................................... 43 Chapter 25: Removing the touchpad................... 45 Prerequisites..................................45 Procedure....................................45 Chapter 26: Replacing the touchpad....................47 Procedure.................................... 47 Post-requisites................................... 47 Chapter 27: Removing the display assembly................48 Prerequisites..................................48 Procedure....................................48 Chapter 28: Replacing the display assembly................52 Procedure....................................52 Post-requisites...................................52 Chapter 29: Removing the system board..................
  • Page 6 Clearing CMOS settings..............................84 Clearing forgotten passwords............................84 Chapter 44: Troubleshooting....................... 85 SupportAssist diagnostics...............................85 Locate the Service Tag or Express Service Code of your Dell computer ..........85 Recovering the operating system..........................85 Flashing the BIOS................................86 Flashing BIOS (USB key)..............................86 Contents...
  • Page 7 Beep codes..................................86 Flea power release................................87 Wi-Fi power cycle................................87 Chapter 45: Getting help and contacting Dell................88 Contents...

  • Page 8: Chapter 1: Before Working Inside Your Computer

    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 9: Recommended Tools

    Recommended tools The procedures in this document may require the following tools: ● Phillips screwdriver #1 ● Plastic scribe Screw list Table 10. Screw list Component Secured to Screw type Quantity Screw image Back cover Palm-rest and keyboard M2.5x7 assembly Battery Palm-rest and keyboard M2x3...

  • Page 10: Chapter 2: After Working Inside Your Computer

    After working inside your computer CAUTION: Leaving stray or loose screws inside your computer may severely damage your computer. 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 11: Chapter 3: Removing The Base Cover

    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. Topics: • Procedure Procedure 1. Close the display and turn the computer over.
  • Page 12 Figure 38. Removing the screws from the base cover a. M2.5x7 screws (9) b. base cover 4. Using a plastic scribe, pry the base cover from the palm-rest and keyboard assembly. Figure 39. Removing the base cover a. plastic scribe b.

  • Page 13: Chapter 4: Replacing The Base Cover

    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. Topics: • Procedure Procedure 1. Slide the tabs on the base cover into the slots on the palm-rest and keyboard assembly and snap the base cover into place.

  • Page 14: Chapter 5: Removing The Battery

    ● If the battery gets stuck inside your computer as a result of swelling, do not try to release it as puncturing, bending, or crushing a lithium-ion battery can be dangerous. In such an instance, contact Dell technical support for assistance. See www.dell.com/contactdell.
  • Page 15 Figure 40. Removing the battery 1. battery cable 2. screw (M2x3) 3. battery 4. palm-rest and keyboard assembly 4. Turn the computer over. 5. Press and hold the power button for five seconds to ground the system board. Removing the battery...

  • Page 16: Chapter 6: Replacing The Battery

    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. Topics: • Procedure • Post-requisites Procedure 1.

  • Page 17: Chapter 7: Removing The Power And Volume-Buttons Board

    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. Topics: • Prerequisites • Procedure Prerequisites 1.
  • Page 18 5. power and volume-buttons board 6. palm-rest and keyboard assembly Removing the power and volume-buttons board...

  • Page 19: Chapter 8: Replacing The Power And Volume-Buttons Board

    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. Topics: • Procedure • Post-requisites Procedure 1.

  • Page 20: Chapter 9: Removing The Power-Adapter Port

    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. Topics: • Prerequisites • Procedure Prerequisites 1.
  • Page 21 Figure 42. Removing the power-adapter port a. power-adapter port cable b. M2x3 screw c. power-adapter port Removing the power-adapter port...

  • Page 22: Chapter 10: Replacing The Power-Adapter Port

    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. Topics: • Procedure • Post-requisites Procedure 1.

  • Page 23: Chapter 11: Removing The Hard Drive

    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. CAUTION: Hard drives are fragile. Exercise care when handling the hard drive.
  • Page 24 Figure 43. Removing the hard-drive assembly a. M2x3 screws (3) b. hard-drive assembly c. palm-rest and keyboard assembly 5. Remove the four screws (M3x3) that secure the hard-drive bracket to the hard drive. 6. Lift the hard drive from the hard-drive bracket. Figure 44.

  • Page 25: Chapter 12: Replacing The Hard Drive

    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. CAUTION: Hard drives are fragile. Exercise care when handling the hard drive.

  • Page 26: Chapter 13: Removing The I/O Board

    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. Topics: • Prerequisites • Procedure Prerequisites 1.
  • Page 27 Figure 46. Removing the screws from the IO board a. M2x3 screws (2) b. I/O board c. palm-rest and keyboard assembly 3. Lift the I/O board off the palm-rest and keyboard assembly. Removing the I/O board...

  • Page 28: Chapter 14: Replacing The I/O Board

    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. Topics: • Procedure • Post-requisites Procedure 1.

  • Page 29: Chapter 15: 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. Topics: • Prerequisites • Procedure Prerequisites 1.
  • Page 30 3. antenna cables (2) 4. wireless card 5. wireless-card slot Removing the wireless card...

  • Page 31: Chapter 16: Replacing 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. Topics: • Procedure • Post-requisites...

  • Page 32: Post-Requisites

    Figure 48. Replacing the wireless card 1. tab 2. notch 3. wireless card 4. antenna cables (2) 5. M2x3 screw 6. wireless-card bracket 7. wireless-card slot Post-requisites 1. Replace the battery. 2. Replace the base cover. Replacing the wireless card...

  • Page 33: Chapter 17: Removing The Coin-Cell Battery

    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. 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 34 3. I/O-board cable 4. latch 5. coin-cell battery cable 4. Turn the I/O-board cable over to access the coin-cell battery. 5. Peel off the coin-cell battery from the palm-rest and keyboard assembly. Figure 50. Removing the coin-cell battery a. I/O-board cable b.

  • Page 35: Chapter 18: Replacing The Coin-Cell Battery

    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. Topics: • Procedure • Post-requisites Procedure 1.

  • Page 36: Chapter 19: Removing The Speakers

    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. Topics: • Prerequisites • Procedure Prerequisites 1.
  • Page 37 3. speakers (2) 4. speaker cable Removing the speakers...

  • Page 38: Chapter 20: Replacing The Speakers

    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. Topics: • Procedure • Post-requisites Procedure 1.

  • Page 39: Chapter 21: Removing The Heat Sink

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. NOTE: The heat sink may become hot during normal operation. Allow sufficient time for the heat sink to cool before you touch it.
  • Page 40 b. heat sink Removing the heat sink...

  • Page 41: Chapter 22: Replacing The Heat Sink

    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. CAUTION: Incorrect alignment of the heat sink can damage the system board and processor.

  • Page 42: Chapter 23: Removing The Memory 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. Topics: • Prerequisites • Procedure Prerequisites 1.

  • Page 43: Chapter 24: Replacing The Memory 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. Topics: • Procedure • Post-requisites Procedure 1.
  • Page 44 2. Replace the base cover. 3. Replace the memory module. Replacing the memory module...

  • Page 45: Chapter 25: Removing The Touchpad

    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. Topics: • Prerequisites • Procedure Prerequisites 1.
  • Page 46 5. Slide and remove the touchpad away from the palm-rest and keyboard assembly. Figure 56. Removing the touchpad a. M2x2 screws (4) b. touchpad c. palm-rest and keyboard assembly Removing the touchpad...

  • Page 47: Chapter 26: Replacing The Touchpad

    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. Topics: • Procedure • Post-requisites Procedure 1.

  • Page 48: Chapter 27: Removing The Display Assembly

    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. Topics: • Prerequisites • Procedure Prerequisites 1.
  • Page 49 Figure 57. Disconnecting the display cable 1. M2x3 screw 2. display-cable bracket 3. display cable 4. tape 5. latch 5. Open the latch and disconnect the sensor-board cable from the I/O board. 6. Remove the antenna cable from the routing guide on the right speaker. 7.
  • Page 50 Figure 58. Disconnecting the IO-board cable 1. latch 2. sensor-board cable 3. antenna cable 4. routing guide 5. I/O-board cable 6. latch 8. Peel the tapes off the display hinges. Figure 59. Removing the tapes a. I/O-board cable b. tape 9.
  • Page 51 Figure 60. Lifting the display assembly a. palm-rest assembly b. display assembly 10. Place the computer face down on a flat surface. 11. Remove the four screws (M2.5x5) that secure the display assembly to the palm-rest and keyboard assembly. 12. Lift the display assembly off the palm-rest and keyboard assembly. Figure 61.

  • Page 52: Chapter 28: Replacing The Display Assembly

    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. Topics: • Procedure • Post-requisites...

  • Page 53: Chapter 29: 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 54 Figure 62. Disconnecting the coin-cell battery and speaker cables 1. I/O-board cable 2. latch 3. coin-cell battery cable 4. speaker cable 5. system board 3. Remove the screw (M2x3) that secures the display-cable bracket to the system board and lift the display-cable bracket off the system board.
  • Page 55 Figure 63. Disconnecting the display cable 1. screw 2. display-cable bracket 3. display cable 4. tape 5. latch 6. system board 5. Open the latch and disconnect the touchpad cable from the system board. 6. Open the latch and disconnect the keyboard cable from the system board. 7.
  • Page 56 Figure 64. Disconnecting the power-adapter port cable 1. system board 2. power-adapter port cable 3. latch 4. touchpad cable 5. keyboard cable 8. Remove the screw (M2x3) that secures the system board to the palm-rest and keyboard assembly. 9. Lift the system board off the palm-rest and keyboard assembly. Removing the system board...
  • Page 57 Figure 65. Removing the system board a. system board b. palm-rest and keyboard assembly Removing the system board...

  • Page 58: Chapter 30: Replacing The System Board

    Entering the Service Tag in the BIOS setup program 1. Turn on or restart your computer. 2. Press F2 when the Dell logo is displayed to enter the BIOS setup program. 3. Navigate to the Main tab and enter the Service Tag in the Service Tag Input field.

  • Page 59: Chapter 31: Removing The Palm-Rest And Keyboard Assembly

    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. Topics: • Prerequisites • Procedure Prerequisites 1.
  • Page 60 Figure 66. Palm-rest and keyboard assembly 1. palm-rest and keyboard assembly Removing the palm-rest and keyboard assembly...

  • Page 61: Chapter 32: Replacing The Palm-Rest And Keyboard Assembly

    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. Topics: • Procedure • Post-requisites Procedure Place the palm-rest and keyboard assembly on a flat surface with the keyboard facing down.

  • Page 62: Chapter 33: Removing The Display Panel

    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. Topics: • Prerequisites • Procedure Prerequisites 1.
  • Page 63 7. display-back cover Removing the display panel...

  • Page 64: Chapter 34: Replacing The Display Panel

    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. Topics: • Procedure • Post-requisites...

  • Page 65: Chapter 35: Removing The Display Hinges

    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. Topics: • Prerequisites • Procedure Prerequisites 1.
  • Page 66 Figure 69. Removing the display hinges a. M2x2.5 screws (2) and M2.5x2.5 screws (4) b. display back-cover and antenna assembly c. hinges (2) Removing the display hinges...

  • Page 67: Chapter 36: Replacing The Display Hinges

    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. Topics: • Procedure • Post-requisites Procedure 1.

  • Page 68: Chapter 37: Removing The Camera

    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. Topics: • Prerequisites • Procedure Prerequisites 1.
  • Page 69 Figure 70. Disconnecting the display cable 1. display panel 2. latch 3. display cable 4. tape 4. Using a plastic scribe, pry the camera off the display-back cover. 5. Turn the camera over and disconnect the camera cable from the camera. Figure 71.
  • Page 70 3. camera cable 4. display-back cover Removing the camera...

  • Page 71: Chapter 38: Replacing The Camera

    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. Topics: • Procedure • Post-requisites Procedure 1.

  • Page 72: Chapter 39: Removing The Sensor Board

    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. Topics: • Prerequisites • Procedure Prerequisites 1.
  • Page 73 Figure 72. Removing the sensor board 1. sensor-board cable 2. latch 3. plastic scribe 4. sensor board Removing the sensor board...

  • Page 74: Chapter 40: Replacing The Sensor Board

    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. Topics: • Procedure • Post-requisites Procedure 1.

  • Page 75: Chapter 41: Downloading Drivers

    Downloading the network driver Downloading the audio driver 1. Turn on your computer. 2. Go to www.dell.com/support. 3. Enter the Service Tag of your computer, and then click Submit. NOTE: If you do not have the Service Tag, use the autodetect feature or manually browse for your computer model.

  • Page 76: Downloading The Usb Driver

    17. Double-click the USB driver file icon and follow the instructions on screen to install the driver. Network adapter and Bluetooth drivers In the Device Manager, check if the network card driver is installed. Install the driver updates from www.dell.com/support. Downloading drivers...

  • Page 77: Downloading The Network Driver

    In the Device Manager, check if the Bluetooth driver is installed. Install the driver updates from www.dell.com/support. Downloading the network driver 1. Turn on your computer. 2. Go to www.dell.com/support. 3. Enter the Service Tag of your computer, and then click Submit.

  • Page 78: Chapter 42: System Setup

    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 79: Bios Overview

    Entering BIOS setup program 1. Turn on (or restart) your computer. 2. 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 80 Enable Advance Battery Charge Configuration from the beginning of the day to a specified work period. Default: Disabled SupportAssist System Resolution Auto OS Recovery Threshold Controls the automatic boot flow for SupportAssist System Resolution Console and for the Dell OS Recovery tool. System setup...
  • Page 81 Table 13. System setup options—Advanced menu (continued) Advanced Default: 2 SupportAssist OS Recovery Enable or disable the boot flow for the SupportAssist OS Recovery tool in the even of certain system errors. Default: Disabled Table 14. System setup options—Security menu Security Admin Password Allows you to set the administrator password.
  • Page 82 Table 16. System setup options—Exit menu Exit Exit Saving Changes Allows you to exit system setup saving your changes. Save Changes Without Exit Allows you to save your changes without exiting system setup. Exit Discarding Changes Allows you to exit system setup without saving your changes.

  • Page 83: Chapter 43: System And Setup Password

    System and setup password You can create a system password and a setup password to secure your computer. Password Description type System password Password that you must enter to log on to your system. Setup password Password that you must enter to access and make changes to the BIOS settings of your computer. CAUTION: The password features provide a basic level of security for the data on your computer.

  • Page 84: Clearing Cmos Settings

    3. Disconnect the coin-cell battery. 4. Wait for one minute. 5. Connect the coin-cell battery. 6. Replace the battery. 7. Replace the base cover. Clearing forgotten passwords Contact Dell technical support to clear the forgotten passwords, see www.dell.com/contactdell. System and setup password...

  • Page 85: Chapter 44: Troubleshooting

    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 86: Flashing The Bios

    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 87: Flea Power Release

    Flea power release 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: 1.

  • Page 88: Chapter 45: 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 18. Self-help resources Information about Dell products and services www.dell.com Dell Help & Support app Tips Contact Support In Windows search, type Contact Support, and press Enter.

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