If you do a search, you will find a lot of problems with concertone units. Mostly the units themselves.
When you pulled the unit out, the red and white are audio, and should be plugged in to audio in, from the tv., and the yellow is video, and should be plugged in to video out. The 16 pin connector goes to the speakers, the small 4 pin with red and black are power.
Make sure the yellow is in video out, and the other end is connected to the tv, video in. Might take an ohmmeter and check the cable. If the tv is good, then it has to be the unit.
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT