AVS Special Member
Join Date: Sep 2006
Location: Long Island and Upstate NY
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You need an optical cable. The back of your Onkyo should also have an optical input, which you probably have to assign in the menu options, which is easy to do.
Your old set-up was basically analog. This is totally different, it is pure digital, which will sound a lot better watching shows or movies in 5.1 surround.
If the back of your tv had a "coaxial" audio output (an orange RCA jack), then you could still uses 1 of the 2 RCA cables, and plug the other end into the "coaxial input" on the back of the Onkyo, but it appears your tv only has the optical output. You could get an adaptor that converts optical to coaxial, but it's just easier and probably cheaper to get an optical cable. Its also commonly referred to as a Toslink cable.