To add to what others have said, but say it a little differently for anyone who may be confused: no, your TV does not
have to be widescreen (16:9), but the
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TV formats
all video output for display on a widescreen TV, so if you connect it to a standard (4:3) TV the image will not be proportioned correctly (compressed horizontally). There is a 'TV Resolution' setting on the
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TV, but it only supports widescreen formats (e.g. 720p, 480p, 1080i, 720p/50Hz, 1080i/50Hz, 576p/50Hz); there is no setting for 4:3 displays.
In addition, the
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TV only connects via
component input (three connectors, red, green, blue) or HDMI. It does not support composite (one connector, yellow) input to your TV. To my knowledge, component input is standard on widescreen/HD TV's, but is much less common (though not unheard of) on 4:3 TV's.
If you have a 4:3 TV that doesn't have component inputs you are all but out of luck. You would have to have some device that converts component video to composite (or if your TV's really old, RF), and even then the image would be distorted.
If you have a 4:3 TV that
does support component input you will be able to connect the
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TV and you will see an image, but it will be distorted. Some TV's in this category have a '16:9' or 'widescreen' mode, which will correct the image proportions in the TV, probably by
letterboxing, but possibly by
cropping the sides (full screen mode).