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System board
NOTE: All system board spare part kits include replacement thermal material.
Description Spare part number
For use in 4540s models with:
UMA graphics with WWAN 683496-001
UMA graphics without WWAN 683495-001
1-GB of discrete graphics memory 683493-001
2-GB of discrete graphics memory 683494-001
System board for use in 4440s/4441s models with:
1-GB discrete graphics 683493-001
2-GB discrete graphics 683494-001
UMA graphics without WWAN 683495-001
UMA graphics and with WWAN 683496-001
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 42).
5. Remove the following components:
a. Bottom door (see
Bottom door on page 44).
b. Hard drive (see
Hard drive on page 48)
c. Optical drive (see
Optical drive on page 46)
d. Keyboard (see
Keyboard on page 56)
e. Heat shield (see
Heat shield on page 59)
f. Fan (see
Fan on page 61)
g. Heat sink (see
Heat sink on page 63)
h. Top cover (see
Top cover on page 67)
Component replacement procedures 85