3.Disconnect all external devices from the computer.
4.Remove the battery (see Battery on page 67), and then remove the following components:
a.Service cover (see Service cover on page 69)
b.Smart Card reader (see Smart Card reader on page 70)
c.Optical drive (see Optical drive on page 71)
d.Hard drive (see Hard drive on page 75)
e.Fan (see Fan on page 85)
f.Modem module (see Modem module on page 84)
g.Fan (see Fan on page 85)
h.Keyboard (see Keyboard on page 86)
i.Base enclosure (see Base enclosure on page 91)
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:
●SIM (see SIM on page 68, if applicable)
●Memory module (see Memory module on page 77)
●WWAN module (see WWAN module on page 79)
●WLAN module (see WLAN module on page 81)
●Heat sink (see Heat sink on page 110)
●Processor (see Processor on page 114)
Remove the system board:
1.Release the wireless antenna cables (1) from the routing clips (2) attached to the system board.
108 Chapter 4 Removal and replacement procedures