WWAN moduleNOTE: Not available for computers with Mobile Mi installed.
Description Spare part number
Qualcomm EV-DO/HSPA WWAN module 531993-001
CAUTION: The WWAN module and the WLAN module are not interchangeable.
To prevent an unresponsive system, replace the wireless module only with a wireless module authorized
for use in the computer by the governmental agency that regulates wireless devices in your country or
region. If you replace the module and then receive a warning message, remove the module to restore
computer functionality, and then contact technical support.
Before removing the WWAN module, 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 36).
5. Remove the SIM (see SIM on page 37).
6. Remove the following components:
a. Keyboard (see Keyboard on page 40)
b. Hard drive or solid-state drive (see Mass storage devices on page 44)
c. Top cover (see Top cover on page 46)
Remove the WWAN module:
1. Remove the 2 Phillips PM2.0×3.0 screws (1) that secure the WWAN connector module (3) to the
system board. (The edge of the module opposite the slot rises away from the computer.)
2. Disconnect the wireless antenna cables (2) from the terminals on the WWAN module.
NOTE: The red WWAN antenna cable is connected to the WWAN module “Main” terminal.
The blue WWAN antenna cable is connected to the WWAN module “Aux” terminal.
52 Chapter 4 Removal and replacement procedures