I have set up my receiver, DVD player and RF modulator with all of the appropriate connections. From the receiver to RF modulator, I have 3 connections in the VCR 1 Out on the receiver and the other 3 connections on the RF Modulator go into Audio (L/R) and Video. For the DVD to Receiver cable I have on the back of the DVD player it is the Stereo/Audio Out(L/R) and TV/Video Out. On the receiver, red/white/yellow plugged into DVD ports. I get audio when I play the DVD but I don't get video. I turn my TV to Channel 3 and the RF Modulator is on and set to Ch.3. What am I missing?