Before removing the system board, follow these steps:
1. Turn off 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 the power from the computer by unplugging the power cord from the computer.
3. Disconnect all external devices from the computer.
4. Remove the battery (see 
Battery on page 40), and then remove the following components:
a. Service door (see 
Service door on page 41)
b. Hard drive (see 
Hard drive on page 42)
c. Display assembly (see 
Display assembly on page 53)
d. Bottom cover (see 
Bottom cover on page 61)
e. Media card reader board (see 
Media card reader board on page 67)
f. Fan (see 
Fan on page 68)
NOTE: 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:
●
WLAN module (see 
WLAN module on page 44)
●
Memory module (see 
Memory module on page 46)
●
Heat sink (see 
Heat sink on page 73)
Remove the system board:
1. Disconnect the monitor connector board cable (1) from the system board.
2. Disconnect the speaker cable (2) from the system board.
Component replacement procedures 71