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What you are talking about, I think, is the RCA multi-cable system (red, yellow, and white) of video (and audio) signal.
If you get a message about a DVD device or a power adapter, then probably you cannot directly connect USB from the camera to the TV.
If you had a DVD burner device hooked up to the TV, with a USB port on it, then you could select it, select its model #, or the like.
As it is, a RCA-to-HDMI adapter might be the most practical way of getting the signal from your Legria to the TV.
Such as this:
As to whether the USB can be used and what to enter at the prompt under these circumstances.... I am looking that up (to double-check on my impression that RCA-to-HDMI might be the best choice here... or not) and also might need to know, what model is your new LG TV?
That USB interface is for transfer of videos to a DVD burning device; the choice between DVD burner and Power Adapter is simply an indication it doesn't necessarily have TV output capability.
But you can try selecting 'DVD Burner' and see if the TV will accept video playback through the USB port.
If that doesn't work, I would recommend going with the RCA-to-HDMI adapter or converter.
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Perhaps. Thanks for being understanding.
Does your new LG TV have an HDMI input port?
That might be easier to get working than video via USB (which was what I was proposing, in brief.)
USB on an older camera like yours might be, even if working, rather slow. Owing to its being an earlier version of USB.
I am pleased to have shed some light on the situation.
I hope the hookup works as it should.
Thank you for asking your question here at JustAnswer.com.