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System board
NOTE: The system board spare part kit includes replacement thermal material.
Description Spare part number
For use only on computer models equipped with the Windows 8 Professional operating system in
all countries and regions except the People's Republic of China and the Ukraine
685404-601
For use only on computer models equipped with the Windows 8 Standard operating system in all
countries and regions except the People's Republic of China and the Ukraine
685404-501
For use only on computer models equipped with the Windows 7 operating system in all countries
and regions except the People's Republic of China and the Ukraine
685404-001
For use only on computer models equipped with the Windows 7 operating system in the People's
Republic of China and the Ukraine
692857-001
Before removing the system board, follow these steps:
1.
Turn off 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 the power from the computer by unplugging the power cord from the computer.
3. Disconnect all external devices from the computer.
4.
Remove the battery (see
Battery on page 50), and then remove the following components:
a. Service cover (see
Service cover on page 52)
b. Bluetooth module (see
Bluetooth module on page 54)
c. Speaker assembly (see
Speaker assembly on page 56)
d. Optical drive (see
Optical drive on page 57)
e. Hard drive (see
Hard drive on page 58)
f. Fan (see
Fan on page 60)
g. WWAN module (see
WWAN module on page 61)
h. Modem module (see
Modem module on page 68)
i.
Keyboard (see
Keyboard on page 69)
j. Base enclosure (see
Base enclosure on page 74)
NOTE: 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 51)
●
Memory module (see
Memory module on page 53)
Component replacement procedures
79