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System board
NOTE: The processor is included on the system board.
The system board Thermal Material Kit, part number 680571-001, includes replacement thermal
paste and pads.
Description Spare part number
System board 704989-001
IMPORTANT: Make special note of each screw and screw lock size and location during removal
and replacement.
Before removing the system board, follow these steps:
1. Shut down the computer.
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 20).
5. Remove the keyboard (see
Keyboard on page 24).
6. Remove the top cover (see
Top cover on page 28).
7. Remove the hard drive (see
Hard drive on page 32).
8. Remove the USB board (see
USB board/Audio jack on page 34).
9. Remove the WLAN (see
WLAN module on page 35).
After removing the system board, be sure that the following components are removed from
the defective system board and installed on the replacement system board:
●
Memory module (see
Memory module on page 41)
●
RTC battery (see
RTC battery on page 44)
●
Heat sink (see
Heat sink on page 46)
●
PCH heat sink (see
PCH heat sink on page 45)
Remove the system board:
1. Disconnect the following cables from the system board:
●
Display panel cable (1)
●
Speaker cable (2)
●
Fan power connector (3)
38 Chapter 4 Removal and replacement procedures