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(Paul) wrote:
You are also right that without a specific TV make and model, it's
hard to give real information. But, as the non-TV-expert, it is easy
for me to say that there may be general information pertaining to
television sets, such as: "Well, first we have the tuner, which
usually outputs data in such and such format,

A tuner will typically produce composite video, as that is what is
modulated up into UHF or VHF in the first place. An RCA jack is
often used for consumer composite video interfaces.

That should be enough to get started.