System Board Assembly

Advance Technical Repair of Laptops Motherboard

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The system board's basic input/output system (BIOS) chip contains the system service tag number, which is also visible on a bar-code label on the bottom of the computer. The replacement kit for the system board assembly includes a diskette that provides a utility for transferring the service tag number to the replacement system board assembly.

Removing the System Board

NOTICE: To avoid damaging the system board, you must remove the main battery before you service the computer.

1.

Remove

the

main battery and secondary battery (if present)

2.

Remove

the

device from the modular bay (if present).

3.

Remove

the

keyboard assembly.

4.

Remove

the

display assembly.

5.

Remove

the

palmrest assembly.

6.

Remove

the

microprocessor module.

7. Verify that all PC Cards or plastic blanks are removed from the PC Card slot.

8. Verify that the PC Card ejectors do not extend from the PC Card slot.

9. Remove the two screws securing the system board assembly (see Figure 22).

• Locate and remove the 4-mm screw with captive washer on the far left side of the computer between the hard-disk drive assembly and the PC Card slot.

• Locate and remove the 4-mm screw with captive washer on the far right side of the computer in front of the thermal cooling assembly and to the right of the microprocessor module. This assumes that an optional modem is not present.

NOTES: If the optional modem is present in your system, locate and remove the 10-mm screw with washer that secures the modem assembly.

You can easily locate these screws by looking for the white marks on the system board (or modem) that outline the captive washers (see Figure 22).

4-mm screw with captive washers white marks on the system board system board assembly

~~ 10-mm screw (system with modem)

or 4-mm screw (system without modem)

4-mm screw with captive washers system board assembly

~~ 10-mm screw (system with modem)

or 4-mm screw (system without modem)

white marks on the system board

81300 Hl5 A00

bottom case assembly

10 mm

Figure 22. System Board Assembly bottom case assembly

10 mm

Figure 22. System Board Assembly

10. Remove the modem (if present).

11. Lift the system board assembly out of the bottom case assembly.

Replacing the System Board

1. Install the replacement system board.

2. Replace the modem (if present).

3. Replace the system board mounting screws.

4. Replace the microprocessor, the palmrest assembly, the display assembly and the keyboard assembly.

NOTE: Be sure to transfer the memory module(s) to the replacement system board assembly.

5. Replace the modular bay devices and any PC Cards or plastic blanks in the PC Card slot.

6. Insert the diskette (or CD-ROM) that accompanied the replacement system board assembly into the appropriate drive, and turn on the computer. Follow the instructions on the display screen.

NOTE: After replacing the system board assembly, be sure to enter the system's service tag number into the BIOS of the replacement system board assembly.

Thermal Cooling Assembly

Noznicove Plosiny
Figure 23. Thermal Cooling Assembly Removal

NOTICE: To avoid damaging the system board, you must remove the main battery before you service the computer.

1. Remove the main battery and secondary battery (if present).

2. Remove the device from the modular bay.

3. Remove the keyboard assembly.

4. Remove the display assembly.

5. Remove the palmrest assembly.

6. Remove the microprocessor module.

7. Remove the modem (if present).

8. Remove the system board assembly.

9. Disconnect the exhaust-fan power cable from the connector on the system board.

10. Remove the two 4-mm screws securing the thermal cooling assembly and exhaust fan, and then remove the thermal cooling assembly and exhaust fan (see Figure 23).

Module Latch Assemblies

Unistrut Detail

NOTICE: To avoid damaging the system board, you must remove the main battery before you service the computer.

1.

Remove

the

main battery and secondary battery (if present)

2.

Remove

the

device from the modular bay.

3.

Remove

the

keyboard assembly.

4.

Remove

the

display assembly.

5.

Remove

the

palmrest assembly.

6. Remove the left module latch button from the bottom case assembly by carefully squeezing the snap tabs (see Figure 25).

Apply pressure to the module latch and spring while unsnapping the snap tabs to prevent the module latch assembly from coming loose from the case. If the module latch assembly does come loose from the case:

a. Carefully reinsert the spring onto the slider on the module latch, and reinstall the module latch into the holding features on the inside of the b. Ensure that the slider is inserted in its respective hole, that the side of the latch with the two bumps is facing the back of the case, and that the surface with the wear ribs is facing the bottom of the case (see Figure 25).

7. Snap in the new latch button from the bottom of the base, making certain its snap tabs are fully engaged in the module latch.

8. Ensure that the newly installed latch moves smoothly and freely when pushed and released.

9. Repeat steps 6 through 8 for the latch on the right side.

case.

Figure 25. Left Module Latch and Spring

Index

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