Need help with older surround receiver with new roku smart TV

Aug 13, 2018
I have a Sony surround receiver model # str-sk2300 and a new 55" tcl roku smart TV. My dilemma is that I've tried HDMI but my receiver is not Arc compatible. It is supposed to be able to work using RCA connection,but can't seem to figure out what settings to use for TV. I hope someone can give me a much needed answer. Thanks
Sony has optical and coax digital audio input. TCL, like most TVs doesn't have analog audio output, so use the superior sounding optical audio output it does have. Check the TV manual on how to use the optical audio output.