I have a picture now, but no sound. I have Realtek High Def Audio. I have tried every combination of your choices to no avail. When I right click the TV screen, it tells me that the device is Line in/mic. Yet under Options/Audio, it says my device is High Def Audio. Audio on MP3 playback works fine.
Also, my STB remote will operate the TV, but your controls will not. For example, if I were to enter a channel number, the picture would go off and you have just static looking display. I have scanned for channels and none show up in Available Channels. I can add a channel, but if I make one change from Video Composite, I lose the picture.