HP ProBook 4540s Maintenance And Service Manual page 121

4. Position the computer upside down.
5. Remove the WWAN antenna cables (1) and the WLAN antenna cables (2) from the routing path
on the bottom of the computer.
6. Position the computer upright.
7. Remove the antenna cables (1) from the routing path (2) in the base enclosure.
8. Pull the antenna cables through the hole that routes to the bottom of the computer .
9. Remove four Phillips PM2.5×7.0 screws (1) from the hinges.
Component replacement procedures 113