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System board
NOTE: The system board spare part kit includes replacement thermal material.
Description Spare part number
System boards for use in models without high-definition video:
Intel Atom N455 1.66-GHz processor for use in models without WWAN 633486-001
Intel Atom N455 1.66-GHz processor for use in models with WWAN 633494-001
Intel Atom N475 1.83-GHz processor for use in models without WWAN 633487-001
Intel Atom N475 1.83-GHz processor for use in models with WWAN 633495-001
System boards for use in models with high-definition video:
Intel Atom N455 1.66-GHz processor for use in models without WWAN 636336-001
Intel Atom N455 1.66-GHz processor for use in models with WWAN 636338-001
Intel Atom N475 1.83-GHz processor for use in models without WLAN 636337-001
Intel Atom N475 1.83-GHz processor for use in models with WLAN 636339-001
System board with Intel Atom N550 1.5-GHz processor, 1-MB level 2 cache, 667-MHz FSB, dual-
core
638148-001
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 following components:
a. Battery (see
Battery on page 35).
b. Service access cover (see
Service access cover on page 38).
c. Hard drive (see
Hard drive on page 40).
d. Keyboard (see
Keyboard on page 50).
e. Display assembly (see
Display assembly on page 56).
5. Disconnect the WWAN antenna cables from the WWAN module (see
WWAN and GPS modules
(select models only) on page 43).
6. Disconnect the WLAN antenna cables from the WLAN module (see
WLAN module on page 45).
66 Chapter 4 Removal and replacement procedures