1993 RCA Home theater TV s-video programming

I have an Old RCA tv..I have been wanting to hook up the s-video input to make my ps2/x-box hook-ups I have already digital cable and dvd player on my 2 extra inputs...but when I hook up the s-video..I get nothing..I have long lost the original remote and manual...I believe I have to re-program the tv for the s-video..Please help