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System Board

Dell™ Latitude™ D420 Service Manual

  Removing the System Board

  Replacing the System Board

Removing the System Board

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface (such as the back panel) on the computer.

The system board's BIOS chip contains the Service Tag, which is also visible on a barcode label on the bottom of the computer. The replacement kit for the system board includes a CD that provides a utility for transferring the Service Tag to the replacement system board.

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

CAUTION: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your computer's electronic components. You can do so by touching an unpainted metal surface.

NOTICE: Handle components and cards by their edges, and avoid touching pins and contacts.

1. Follow the instructions in Before You Begin.
   
   
2. Remove any installed PC Cards from the PC Card slot.
   
   
3. Remove any installed memory modules or Mini PCI cards (see Memory and Mini-Cards).
   
   
4. Remove the hard drive (see Hard Drive).
   
   
5. Remove the hinge cover (see Hinge Cover).
   
   
6. Remove the keyboard (see Keyboard).
   
   
7. Remove the internal card with Bluetooth® wireless technology (see Internal Card With Bluetooth® Wireless Technology).
   
   
8. Remove the display assembly (see Display Assembly).
   
   
9. Remove the palm rest (see Palm Rest).
   
   
10. Disconnect the power button connector from the system board.
    
    
11. Disconnect the suspend-switch sensor board connector from the system board.
    
    
12. Remove the remaining two M2.5 x 5-mm screws that secure the system board to the computer base.
    
    
13. Lift the system board at an angle toward the side of the computer and out of the computer base.
    
    

1	computer base	2	M2.5 x 5-mm screws (2)	3	system board assembly
4	power button connector	5	suspend-switch sensor board

Replacing the System Board

1. Follow all of the steps in Removing the System Board in reverse order.
   
   

NOTICE: Before turning on the computer, replace all screws and ensure that no stray screws remain inside the computer. Failure to do so may result in damage to the computer.

2. Turn on the computer.
   
   

NOTE: After you have replaced the system board, enter the computer Service Tag into the BIOS of the replacement system board.

3. Insert the CD that accompanied the replacement system board into the appropriate drive. Follow the instructions that appear on the screen.
   
   

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