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In order to use CC decoder inside the TV and see CC using Component inputs, the source (i.e. DVD player) must be in interlaced (non-progressive) mode and 480 lines or less. 480i is not high definition. Also, the CC decoder must be analog, not digital.
I assumed you were watching HDTV programs using OTA antenna and were able to see CC. This is digital CC which is very different than analog CC. Digital CC decoder inside TV is only available from OTA inputs, not HDMI, Component or any other inputs.
In order to watch CC and HDTV using HDMI or Component inputs, you will need an external source like HDTV cable box or computer using special PVR like Media Center Edition. The external source must transmit CC through HDMI or Component cables. Also, you will have to enable digital CC via menu setup of external source. I do not know any DVD makers that transmits CC over HDMI or Component cables. Plus, DVD players are NOT high definition.
Personally, I prefer sub-titles (or SDH) when watching DVD movies. I like the transparent background of sub-titles as opposed to CC with solid black background. CC in DVD movies are slowly disappearing because sub-titles are easier and cheaper to make. As time goes on, the content of sub-titles are improving. We have to be patient.
Peter
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