I have a sharp LC32GA5E. When I set the sharp to use AV1 as RGB I get no picture only sound, when connected to my Toshiba SD34VB DVD/VCR combi. The combi is set to RGB out and is connected by a fully working scart cable. The only way I can get a picture is to turn the RGB to mode on the sharp TV to DVD. Any suggestions of how to remedy this?