Unfortunately, the HDMI standard does not carry the CC digital information, for any TV to decode and display it on its own. Therefore, when watching HDMI source the CC button on the TV's own remote, cannot work.
However, each Cable, Satellite or Internet streaming device can decode the CC information from the source (when available). Then the CC text is inserted into the picture and sent to the TV via HDMI or any other video connection.
Look for CC option on your Cable's or Satellite's remote control, or on the source device's menus.
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