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System Board

Dell Precision™ M6400 Service Manual

  Removing the System Board

  Replacing the System Board

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 media that provides a utility for transferring the Service Tag to the replacement system board.

Removing the System Board

CAUTION: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best practices information, see the Regulatory Compliance Homepage on www.dell.com at: www.dell.com/regulatory_compliance.

1. Follow the instructions in Before Working on Your Computer.
   
   
2. Remove the base assembly cover (see Removing the Base Assembly Cover).
   
   
3. Remove the primary hard drive (see Removing the Primary Hard Drive (HDD1)) and the secondary hard drive (see Removing the Secondary Hard Drive (HDD2)).
   
   
4. Remove the optical drive (see Removing the Optical Drive).
   
   
5. If applicable, remove the WWAN card, (see Removing a WWAN Card).
   
   
6. If applicable, remove the card from the WLAN/WiMax card slot (see Removing the WLAN/WiMax Card).
   
   
7. If applicable, remove the card from the WPAN/UWB card slot (see Removing a WPAN Card).
   
   
8. Remove the DIMM C and DIMM D memory modules (see Removing a Memory Module).
   
   
9. Remove the coin-cell battery (see Removing the Coin-Cell Battery).
   
   
10. Remove the LED cover (see Removing the LED Cover).
    
    
11. Remove the keyboard (see Removing the Keyboard).
    
    
12. Remove the display assembly (see Removing the Edge-to-Edge Display or Removing the Display Assembly).
    
    
13. Remove the palm rest (see Removing the Palm Rest Assembly).
    
    
14. Remove the DIMM A and DIMM B memory modules (see Removing a Memory Module).
    
    
15. Remove the fan (see Removing the Fan).
    
    
16. Remove the processor heatsink assembly (see Removing the Processor Heatsink Assembly).
    
    
17. Remove the video card/heatsink assembly (see Removing the Video Card/Heatsink Assembly).
    
    
18. Remove the processor (see Removing the Processor Module).
    
    
19. Remove the card cage (see Removing the Card Cage).
    
    
20. Remove the left I/O board (see Removing the Left I/O Board).
    
    
21. Remove the right I/O board (see Removing the Right I/O Board).
    
    
22. Remove the eight M2.5 x 5-mm screws labeled with white arrows from the system board.
    
    
23. Remove the two M2.5 x 8-mm screws from the bracket and remove the bracket.
    
    

24. Lift the system board out of the base assembly.
    
    

Replacing the System Board

CAUTION: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best practices information, see the Regulatory Compliance Homepage on www.dell.com at: www.dell.com/regulatory_compliance.

NOTICE: Ensure that any loose cables do not get caught beneath the system board.

1. Place the system board into the base assembly.
   
   
2. Replace the bracket with the two M2.5 x 8-mm screws.
   
   
3. Replace the eight M2.5 x 5-mm screws on the system board in the holes labeled with white arrows.
   
   
4. Replace the right I/O board (see Replacing the Right I/O Board).
   
   
5. Replace the left I/O board (see Replacing the Left I/O Board).
   
   
6. Replace the card cage (see Replacing the Card Cage).
   
   
7. Replace the processor (see Replacing the Processor Module).
   
   
8. Replace the video card/heatsink assembly (see Replacing the Video Card/Heatsink Assembly).
   
   
9. Replace the processor heatsink assembly (see Replacing the Processor Heatsink Assembly).
   
   
10. Replace the fan (see Replacing the Fan).
    
    
11. Replace the DIMM A and DIMM B memory modules (see Replacing a Memory Module).
    
    
12. Replace the palm rest (see Replacing the Palm Rest Assembly).
    
    
13. Replace the display assembly (see Replacing the Edge-to-Edge Display or Replacing the Display Assembly).
    
    
14. Replace the keyboard (see Replacing the Keyboard).
    
    
15. Replace the LED cover (see Replacing the LED Cover).
    
    
16. Replace the coin-cell battery (see Replacing the Coin-Cell Battery).
    
    
17. Replace the DIMM C and DIMM D memory modules (see Replacing a Memory Module).
    
    
18. If applicable, replace the WWAN card, (see Replacing a WWAN Card).
    
    
19. If applicable, replace the card in the WLAN/WiMax card slot (see Replacing the WLAN/WiMax Card).
    
    
20. If applicable, replace the card in the WPAN/UWB card slot (see Replacing a WPAN Card).
    
    
21. Replace the optical drive (see Replacing the Optical Drive).
    
    
22. Replace the primary hard drive (see Replacing the Primary Hard Drive (HDD1)) and the secondary hard drive (see Replacing the Secondary Hard Drive (HDD2)).
    
    
23. Replace the base assembly cover (see Replacing the Base Assembly Cover).
    
    
24. Follow the procedures in After Working on Your Computer.
    
    

NOTE: If you use a BIOS update program disc to flash the BIOS, press <F12> before inserting the disc in order to set the computer to boot from the disc for one time only. Otherwise, you must enter the system setup program to change the default boot order.

25. Flash update the BIOS (see Flashing the BIOS for more information).
    
    
26. Enter the system setup program to update the BIOS on the new system board with the computer Service Tag. For information on the system setup program, see the Dell™ Technology Guide at support.dell.com.
    
    

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