Closed Captioning may not appear on your TV or appear intermittently for the reasons described below. 1) Closed captioning may or may not function when viewing high-definition television (HDTV) programming because the captioning is not sent from the broadcaster. Contact your signal provider for further assistance. 2) Not all stations broadcast programs (including commercials) with closed captioning. 3) When changing channels on the TV, there may be a delay before closed captioning begins to display.