System board
NOTE: All system board spare part kits include replacement thermal material and VGA support
bracket.
NOTE: Models that support quad-core processors have four memory slots. Models that support
dual-core processors have two memory slots.
Description Spare part number
For use with dual-core processors 652637-001
(Alcor chip upgrade) For use with dual-core processors 684318-001
For use with quad-core processors 652638-001
(Alcor chip upgrade) For use with quad-core processors 684319-001
For use with dual-core processors in China and Ukraine 656213-002
(Alcor chip upgrade) For use with dual-core processors in China and Ukraine 684320-001
For use with quad-core processors in China and Ukraine 656214-002
(Alcor chip upgrade) For use with quad-core processors in China and Ukraine 684321-001
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 48).
5. Remove the service access cover (see
Service access cover on page 50).
6. Remove the following components:
a. Hard drive (see
Hard drive on page 60)
b. Optical drive (see
Optical drive on page 65)
c. Keyboard (see
Keyboard on page 67)
d. Top cover (see
Top cover on page 71)
e. Video card fan/heat sink assembly (see
Video card fan/heat sink assembly on page 84)
f. Processor heat sink (see
Processor heat sink on page 86)
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 49)
●
Memory modules (see
Expansion memory modules on page 51)
Component replacement procedures 107
