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 in all countries and regions except the People's Republic of China:
● For use with computer models equipped with Intel quad-core processors 688746-001
● For use with computer models equipped with Intel dual-core processors 688745-001
For use only in the People's Republic of China:
● For use with computer models equipped with Intel quad-core processors 690035-001
● For use with computer models equipped with Intel dual-core processors 690034-001
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 51).
5. Remove the service access cover (see
Service access cover on page 52).
6. Remove the optical drive (see
Optical drive on page 63) or upgrade bay hard drive (see Upgrade
bay hard drive on page 66).
7. Remove the keyboard (see
Keyboard on page 71).
8. Remove the top cover (see
Top cover on page 83).
9. Remove the display assembly (see
Display assembly on page 88).
10. Remove the fan/graphics board heat sink (see
Fan/graphics board heat sink assembly
on page 75).
11. Remove the processor heat sink (see
Processor heat sink on page 110).
12. Remove the audio/USB 2.0 board (see
Audio/USB 2.0 board on page 94).
13. Remove the speaker assembly (see
Speaker assembly on page 96).
14. Remove the Card reader/USB 3.0 board (see
Card reader/USB 3.0 board on page 102).
When replacing the system board, be sure that the following additional components are removed
from the defective system board and installed on the replacement system board:
●
SIM (see
SIM on page 52)
● Bluetooth module and cable (see
Bluetooth module on page 59 and Bluetooth module cable
on page 103)
●
WLAN module (see
WLAN module on page 60)
●
WWAN module (see
WWAN module on page 62)
●
RTC battery (see
RTC battery on page 63)
104 Chapter 4 Removal and replacement procedures
