First I would try pressing the DISPLAY button on your remote which controls the display and if that is not it, it's probably the flex cable. These cables go bad after a while and needs to be replaced. you may also contact Pioneer to see if there is a recall on this part as they may pay for it, otherwise you can purchase it on ebay - http://cgi.ebay.com/PIONEER-AVH-P7480DVD-AVX-P7300DVD-FLEX-RIBBON-CABLE-/120529728036
Answers & Comments
First I would try pressing the DISPLAY button on your remote which controls the display and if that is not it, it's probably the flex cable. These cables go bad after a while and needs to be replaced. you may also contact Pioneer to see if there is a recall on this part as they may pay for it, otherwise you can purchase it on ebay - http://cgi.ebay.com/PIONEER-AVH-P7480DVD-AVX-P7300DVD-FLEX-RIBBON-CABLE-/120529728036