System Board Assembly

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 case.

Figure 21. Left Module Latch and Spring diskette that provides a utility for transferring the service tag number to the replacement system board assembly.

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

1. Remove the main battery.

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 any PC Cards or plastic blanks from the PC Card slot.

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

9. Remove the following two screws from the system board assembly (see Figure 19):

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

• The 4-mm screw with captive washer located on the far right side of the computer in front of the TCA and to the right of the microprocessor module.

NOTE: Locate these screws by looking for the white circles on the system board that outline the captive washers.

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

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

Insert the diskette that accompanied the replacement system board assembly into the diskette drive, and turn on the computer. Follow the instructions on the display screen.

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

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

1. Remove the main battery.

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 system board assembly.

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

9. 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 20).

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