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System board
Description Spare part number
Equipped with Intel Core Duo U7600 (1.20-GHz) processor (533-MHz FSB and 2-MB L2 cache) 451720-001
Equipped with Intel Core Duo U7500 (1.06-GHz) processor (533-MHz FSB and 2-MB L2 cache) 451719-001
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 41).
5. Remove the following components:
a. Hard drive (see
Hard drive on page 52)
b. Optical drive (see
Optical drive on page 56)
c. Switch cover (see
Switch cover on page 57)
d. Keyboard (see
Keyboard on page 59)
e. Display assembly (see
Display assembly on page 62)
f. Top cover (see
Top cover on page 67)
When replacing the system board, be sure that the following components are removed from the defective
system board and installed on the replacement system board:
●
SIM (see
SIM on page 42)
●
Memory module (see
Memory module on page 45)
●
RTC battery (see
RTC battery on page 47)
●
WLAN module (see
WLAN module on page 48)
●
WWAN module (see
WWAN module on page 54)
●
Fan/heat sink assembly (see
Fan/heat sink assembly on page 74)
●
PC Card assembly (see
PC Card assembly on page 76)
●
Modem module (see
Modem module on page 78)
Remove the system board:
1. Turn the computer upside down, with the rear panel toward you.
70 Chapter 4 Removal and replacement procedures