Look in the manual.
http://www.retrevo.com/support/Onkyo-HT-R500-Receivers-manual/id/365bh147/t/2/
The only vital connection is a simple composite cable or whatever your unidentified TV requires. The TV has a manual, too, somewhere.
I personally would not bother routing any video from external sources through the receiver as no signal will benefit from the extra cables and connections.
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