iPhone 3G + AV Cable = no video? Try safari
I just bought a SCOSCHE component audio/video cable from Staples for my iPhone 3GS. I get audio only out. No video out. The below posting about some iphone apps output video and other don't is correct.
Ipod and youtube output video but none of my TV apps do. There is hope! The web browser, Safari also supports video if the website supports iphones. Only for some of the network websites do. You have to surf to the website and navigate to the full episodes but once you start viewing the episode, the video signal to the TV turns on. Surprisingly, TV.com and Netflix neither work. However, CBS, NBC, MSNBC, CNN and Reuters did work for me! No app needed.