WLAN module
Table 5-5 WLAN module spare part information
Description Spare part number
Qualcomm QCA6174A-5 ac 2×2 + Bluetooth® 4.2 M.2 2230 PCI-e WW WLAN module L54709-001
IMPORTANT: 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 device
functionality, and then contact technical support.
Before removing the WLAN module, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is o 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 rst unplugging the power cord from the AC outlet, and then
unplugging the AC adapter from the computer.
4. Remove the keyboard/top cover (see Keyboard/top cover on page 24).
5. Disconnect the battery cable from the system board (see Battery on page 32).
Remove the WLAN module:
1. Disconnect the WLAN antenna cables (1) from the terminals on the WLAN module.
NOTE: The #1/white WLAN antenna cable connects to the WLAN module #1/Main terminal. The #2/ black
WLAN antenna cable connects to the WLAN module #2/Aux terminal.
2. Remove the Phillips M2.0×2.9 screw (2) that secures the WLAN module to the system board. (The WLAN
module tilts up.)
3. Release the shielding (3) that secures the WLAN module to the slot.
34 Chapter 5 Removal and replacement procedures
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