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System Board Assembly

Dell™ Latitude™ D520 Service Manual

  Removing the System Board Assembly

  Replacing the System Board Assembly

Removing the System Board Assembly

CAUTION: Before you begin the following procedure, 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.

NOTICE: To help prevent damage to the system board, remove the main battery (see Before Working Inside Your Computer) before working inside 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.

1. Follow the instructions in Before You Begin.
   
   
2. Remove the hard drive (see Removing the Hard Drive).
   
   
3. Remove the media bay device (see Media Bay).
   
   
4. Remove the memory module(s) (see Memory).
   
   
5. Remove the modem (see Removing the Modem).
   
   
6. Remove the Mini-Card (see Mini-Card).
   
   
7. Remove the hinge cover (see Hinge Cover).
   
   
8. Remove the keyboard (see Removing the Keyboard).
   
   
9. Remove the display assembly (see Removing the Display Assembly).
   
   
10. Remove the processor thermal-cooling assembly (see Removing the Processor Thermal-Cooling Assembly).
    
    
11. Remove the processor (see Removing the Processor Module).
    
    
12. Remove the palm rest (see Removing the Palm Rest).
    
    

NOTE: It is not required but is highly recommended that you remove the system fan (see System Fan) to allow easier access to the system board.

13. Remove the speaker assembly (see Removing the Speaker Assembly).
    
    
14. Remove the two M2.5 x 5-mm screws labeled "B."
    
    

1

M2.5 x 5-mm screws (2)

15. Turn the computer upside down and remove the four M2 x 3-mm screws labeled "B" that secure the system board to the computer base.
    
    

1	M2 x 3-mm screws labeled "B" (4)

16. Remove the system board assembly:
    
    
    1. With the back of the computer facing you, grasp the upper-right corner of the system board assembly and lift it slightly; slowly easing the connectors out of their access holes on the back and side of the computer base.
       
       

2. Pull the system board assembly away from you toward the front of the computer to remove the system board assembly.
   
   

1

system board assembly

Replacing the System Board Assembly

1. Perform all of the steps in Removing the System Board Assembly 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: If you use a BIOS update program CD to flash the BIOS, press <F12> before inserting the CD so that you can set up the computer to boot from a CD this one time only. Otherwise, you must enter the system setup program to change the default boot order.

3. Insert the flash BIOS update program CD that accompanied the replacement system board into the optical drive. Follow the instructions that appear on the screen. See Flashing the BIOS for further information.
   
   
4. Enter the system setup program to update the BIOS on the new system board with the computer Service Tag.
   
   

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