System board
Description Spare part number
System board for use only in computer models with Intel processors (includes thermal material) 487274-001
System board for use only in computer models with AMD processors and discrete graphics
subsystems (includes thermal material)
492312-001
System board for use only in computer models with AMD processors and UMA graphics subsystems
(includes thermal material)
492313-001
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:
●RTC battery (see RTC battery on page 50)
●Memory modules (see Memory module on page 52)
●WLAN module (see WLAN module on page 47)
●Modem module (see Modem module on page 73)
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 44)
b. Optical drive (see Optical drive on page 42)
c. Keyboard (see Keyboard on page 54)
d. Switch cover (see Switch cover on page 56)
e. Speaker assembly (see Speaker assembly on page 58)
f. Display assembly (see Display assembly on page 60)
g. Top cover (see Top cover on page 67)
Remove the system board:
1. Turn the computer upright with the right side toward you.
Component replacement procedures 79