Inspiron 24 5420 All-in-One Owner's Manual

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Removing the system board

CAUTION:The information in this section is intended for authorized service technicians only.

Prerequisites

  1. Follow the procedure in Before 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 that 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: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.
  2. Remove the stand.
  3. Remove the back cover.
  4. Remove the I/O cover.
  5. Remove the hard drive.
  6. Remove the system-board shield.
  7. Remove the memory module.
  8. Remove the wireless card.
  9. Remove the M.2 2230 solid-state drive or M.2 2280 solid-state drive, as applicable.
  10. Remove the integrated heat sink or discrete heat sink.

About this task

The following image indicates the connectors on your system board.

Figure 1. System-board connectors
Image: System board connectors
  1. Fan-cable connector
  2. Coin-cell battery
  3. Memory-module slots
  4. Speaker-cable connector
  5. Microphone-module cable connector
  6. Media-card reader cable connector
  7. Wireless-card slot
  8. Power-button board cable connector
  9. Display-cable connector
  10. Backlight-cable connector
  11. Camera-cable connector
  12. Solid-state drive slot
  13. Hard-disk drive connector
  14. Touchscreen-cable connector (optional)

The following image indicates the location of the system board and provides a visual representation of the removal procedure.

Figure 2. Removing the system board
Image: Removing the system board
Figure 3. Lifting the system board off the chassis
Image: Lifting the system board off the chassis

Steps

  1. Disconnect the touchscreen cable from the system board.
    NOTE:This cable is only available on computers that support the touch option.
  2. Disconnect the camera cable from the system board.
  3. Disconnect the backlight cable from the system board.
  4. Disconnect the fan cable from the system board.
  5. Disconnect the speaker cable from the system board.
  6. Disconnect the microphone-module cable from the system board.
  7. Open the latch and disconnect the media-card reader cable from the system board.
  8. Open the latch and disconnect the power-button board cable from the system board.
  9. Open the latch and disconnect the display cable from the system board.
  10. Remove the six screws (M3x5) that secure the system board to the display-assembly base.
  11. Remove the solid-state drive screw mount (M3x4) that secures the system board to the display-assembly base.
  12. Lift the system board off the display-assembly base.

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