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4–34 Maintenance and Service Guide
Removal and replacement procedures
System board
Before removing the system board, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the computer on,
and then shut it down through the operating system.
2. Disconnect all external devices connected to the computer.
3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet and then
unplugging the AC adapter from the computer.
4. Remove the battery (see “Battery” on page 4-7).
5. Remove the following components:
a. Hard drive (see “Hard drive” on page 4-8)
b. Memory modules (see “Memory module” on page 4-10)
c. WLAN module (see “WLAN module” on page 4-12)
d. Optical drive (see “Optical drive” on page 4-14)
e. Keyboard (see “Keyboard” on page 4-16)
f. Top cover (see “Top cover” on page 4-18)
g. Audio board (see “Audio board” on page 4-30)
h. Fan (see “Fan” on page 4-32)
When replacing the system board, be sure that the following additional components are removed from the defective
system board and installed on the replacement system board:
■ RTC battery (see “RTC battery” on page 4-36)
■ Modem module (see “Modem module” on page 4-38)
■ Bluetooth module (see “Bluetooth module” on page 4-40)
■ Heat sink (see “Heat sink” on page 4-42)
■ Processor (see “Processor” on page 4-44)
Description Spare part number
GM45 (includes RTC battery and replacement thermal material) 492152-001
GL40 (includes RTC battery and replacement thermal material) 504452-001