Head Unit Problem

[dasic1]

Dose anyone have the factory option Kenwood DPX-930WMP head unit?

Im trying to hook the tv tuner up to it and are having a few problems trying to get the sound to work. I get the pic on the screen but no sound.

I think what I need to do is select the AUX but I seam not to be able to do this. From reading thishttp://www.kenwood.net-disp.com/j/03products/dpx_930wmp/pdf/dpx_930wmp.pdf it seams like I just have to push the src button to select the AUX.

I noticed that when I didnt have a cd in it skipped the Compact disc option so it seam like its not recognizing that there is something plugged into the AUX in socket. I took the RCA out of the AUX in and put it into another set of holes in the head unit (on page 89 of the link above in the bottom left corner where it says front) and I get sound from the TV and whatever else is selected radio cd or stacker. when plugged into the other set of holes I dont get any sound from the tv.

I removed the head unit and pulled it apart and tested the cables for the AUX in and there 100% fine. Is there a way to test if the head unit itself is faulty? or any ideas how I could solve this or is it just buy a new head unit?