Panasonic VIERA TC-55DX700C Ehelp page 28

CC/SAP is not available when watching TV with a Cable or Satellite
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box connected via HDMI.
If you have a High Definition box, ensure that it is outputting 720p or
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1080i signal.
Tip: press the TV's
Check your box's "aspect" or "format" settings. It should be set to 16:9,
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Widescreen or Full.
If the audio volume is too low, check the box's audio settings.
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Contact your Cable or Satellite provider for instructions of any box
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settings.
INFO button to verify.
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