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Inspiron 3891 Service Manual

PDF

Removing the system board

Prerequisites

  1. Follow the procedure in Before working inside your computer.
  2. Remove the left-side cover.
  3. Remove the front cover.
  4. Remove the fan shroud.
  5. Remove the solid-state drive.
  6. Remove the wireless card.
  7. Remove the hard drive.
  8. Remove the graphics card.
  9. Remove the media-card reader.
  10. Remove the fan and heat-sink assembly.
  11. Remove the processor.

About this task

NOTE For computers that are shipped with 11th Generation Intel Core i5-11400F and 11th Generation Intel Core i7-11700F processors, a VGA-connector cover is installed over the VGA connector, and a HDMI-port cover is installed over the HDMI port.
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. You must make the appropriate changes again after you replace the system board.
NOTE After a service incident where the system board is replaced, an RTC reset cycle will occur. When an RTC Reset cycle occurs, the computer turns on and off three times. An "Invalid Configuration" error message is displayed prompting you to enter the BIOS and configure the date and time. The computer starts functioning normally after setting the date and time.
NOTE Before disconnecting the cables from the system board, note the location of the connectors so that you can reconnect the cables correctly after you replace the system board.

The following image(s) indicate the location of the system board and provides a visual representation of the removal procedure.

Removing the system board 1

Removing the system board 2

Removing the system board 3

Steps

  1. Remove the two screws (6-32) that secure the front I/O bracket to the chassis.
  2. Remove the front I/O bracket from the chassis.
  3. Disconnect the following cables from the system board. Refer to the system-board components for more information about the respective connectors of the following cables.
    • power-supply unit cables
    • hard-drive cable
    • optical drive cable
    • power-button cable
  4. Remove the eight screws (6-32) that secure the system board to the chassis.
  5. Lift the system board at an angle and remove it from the chassis.

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