I'm having the same issue, I plugged a camera directly into the Brown RCA line and received a black screen. I occasionally get scan lines on the screen and the Reverse trigger won't work either. If anybody has any advice or is in the Keene, NH area I could definitely use the hand.
AVIC F-700BT 4.01 Version
Pyle PLCM18SC
I would like to remain with this version since the 2.08 isn't compatible with the iPad