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System Board

Dell™ Inspiron™ 640M/E1405 Service Manual

  Removing the System Board

  Replacing the System Board

Removing the System Board

CAUTION: Before you perform 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.

1. Follow the instructions in Preparing to Work Inside the Computer.
   
   
2. Remove the hard drive (see Removing the Hard Drive).
   
   
3. Remove the optical drive (see Removing the Optical Drive).
   
   
4. Remove the Mini-Card, if applicable (see Removing the Mini-Card).
   
   
5. Remove the modem, if applicable (see Removing the Modem).
   
   
6. Remove the Bluetooth module, if applicable (see Removing the Bluetooth Module).
   
   
7. Disconnect the cable for the Bluetooth module from the system board.
   
   
8. Remove the hinge cover (see Removing the Hinge Cover).
   
   
9. Remove the keyboard (see Removing the Keyboard).
   
   
10. Remove the display assembly (see Removing the Display Assembly).
    
    
11. Remove all memory modules (see Removing a Memory Module).
    
    
12. Remove the microprocessor thermal-cooling assembly (see Removing the Microprocessor Thermal-Cooling Assembly).
    
    
13. Remove the microprocessor module (see Removing the Microprocessor Module).
    
    
14. Remove the palm rest (see Removing the Palm Rest).
    
    
15. Remove the two M2 x 3-mm screws securing the system board from the bottom of the computer.
    
    

1	M2 x 3-mm screws (2)

16. Turn the computer over so that the bottom is facing down and remove the M2.5 x 5-mm screw securing the system board.
    
    
17. Disconnect the fan cable from the system board.
    
    
18. Disconnect the speaker cable from the system board.
    
    
19. Disconnect the modem cable from the system board.
    
    

1	M2.5 x 5-mm screw	2	system board	3	speaker connector
4	fan connector	5	modem connector

20. With the rear of the computer facing you, gently lift the system board assembly from the left side, then slide the system board assembly to the left and lift up on the right side to raise the assembly out of the computer.
    
    

NOTE: It may be necessary to press outward slightly on the plastic around the connectors on the left side of the computer to lift the system board and remove it.

1	system board

Replacing the System Board

CAUTION: Before you perform 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.

1. Follow the instructions in Preparing to Work Inside the Computer.
   
   
2. Follow the instructions in Removing the System Board.
   
   
3. For replacement of the system board, perform 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.

4. Turn on the computer.
   
   

NOTE: After replacing the system board, enter the computer's alpha-numeric Service Tag into the BIOS of the replacement system board.

5. Insert the floppy disk or CD that accompanied the replacement system board into the appropriate drive. Follow the instructions that appear on the screen.
   
   

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