HP ProBook 6455b, 6555b, 6450b and 6550b Notebook PCs Maintenance and Service Guide

Top components
Display components
NOTE: Your computer may look slightly different from the illustration in this section.
Item Component Description
(1) WWAN antennas (2)* Send and receive wireless signals to communicate with
wireless wide-area networks (WWAN).
(2) Internal microphones (1 or 2, varying by computer
model)†
Record sound.
NOTE: If there is a microphone icon next to each
microphone opening, your computer has internal
microphones.
(3) WLAN antennas (2)* Send and receive wireless signals to communicate with
wireless local area networks (WLAN).
(4) Webcam light (select models only) On: The webcam is in use.
(5) Webcam (select models only) Records audio and video and captures still photographs.
(6) Internal display switch Turns off the display or initiates the Sleep state
(Windows 7 and Windows Vista) or Standby (Windows
XP) if the display is closed while the power is on.
*The antennas are not visible from the outside of the computer. For optimal transmission, keep the areas immediately
around the antennas free from obstructions.
†Only computers equipped with a webcam are equipped with 2 microphones. Computers not equipped with a webcam are
equipped with only one microphone.
14 Chapter 2 External component identification