I have the RP2 running RetroPie and have used it via HDMI.
I now want to use my 3.5mm to RCA cable. I have tried but get not picture. My TV seems to see something is there but I get no audio or video. I have made sure the yellow is in yellow, red to red, white to white and that the 3.5mm is firmly in the RP2.
The 3.5 mm jack has 3 black bands if that helps.