When i try to play video, it only plays audio. My phone shows "Tv Connected", however nothing appears on the screen. I looked at the iPhone settings and it only shows the dock connector marked for audio.

I also just updated my 920bt to the newest firmware via this thread

http://avic411.com/index.php?/topic/33260-x920bt-firmware-and-map-upgrade-to-cnsd-210fm-for-free/

Thoughts?

Where did you purchase your iPhone cable?

I am unsure, but if my memory serves me right it was a pioneer brand cable. But I guess it is possible that it is not a pioneer cable.

How can I tell?

If I was to buy a new cable, which should I buy?

A Pioneer cable from a local dealer that you know you can return if its not the problem. Aplace Best Buy.