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Power cable
The power cable is included in the Cable Kit, spare part number 683477-001 for 4540s models,
683640-001 for 4440s/4441s models.
Before removing the power cable, 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 42).
5. Remove the following components:
a. Bottom door (see
Bottom door on page 44).
b. Optical drive (see
Optical drive on page 46)
c. WLAN/Bluetooth module (see
WLAN/Bluetooth combo card on page 54)
d. WWAN module (see
WWAN module on page 52)
e. Keyboard (see
Keyboard on page 56)
f. Top cover (see
Top cover on page 67)
g. Speaker assembly (see
Speaker assembly on page 76)
h. System board (see
System board on page 85)
Remove the power cable:
1. Position the computer upright with the front toward you.
2. If necessary, disconnect the cable from the bottom of the system board (1).
94 Chapter 4 Removal and replacement procedures