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 45).
5.Remove the following components:
a.Hard drive (see Hard drive on page 51)
b.Optical drive (see Optical drive on page 47)
c.Keyboard (see Keyboard on page 61)
d.Switch cover (see Switch cover on page 66)
e.Display assembly (see Display assembly on page 69)
f.Top cover (see Top cover on page 76)
g.Fan (see Fan on page 81)
h.Heat sink (see Heat sink on page 83)
i.Speaker assembly (see Speaker assembly on page 89)
j.Modem module (see Modem module on page 64)
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 46)
●Memory module (see Memory modules on page 57)
●WLAN module (see WLAN module on page 65)
●WWAN module (see WWAN module on page 59)
●Processor (see Processor on page 86)
●Graphics card (see Graphics card on page 87)
●ExpressCard assembly (see ExpressCard assembly on page 94) Remove the system board:
1.Position the computer
Component replacement procedures 91
