Problem with Nesa LCD display

I have been having problems with a Nesa NSV-5803 5.8" display.  I have it in my visor on my 2003 Denali.  It is powered by a Audiovox 10" flipdown unit and a Audiovox DVD player.  The problem looks like a sync problem where the top of the screen tends to curl to the left and sometimes looks like it looses it vertical sync.  I have replaced the video cable to a monster brand - big$$, and also gave it an isolated power source.  The DVD player was just replaced and there is no problem with the display on the flipdown unit. I tested the output from the Audiovox with another small TV I had and it looks fine.  I went back to where I purchased the Nesa and they let me replace it - still the same problem.  Now here is the clincher, I convinced the owner of the video place to let me try a different brand LCD and it worked fine.  So whats up with the Nesa brand? Are they junk or what?  Just wanted to know if anyone else has had the same problems.

Sorry for the long speach - I just spent so much time trouble-shooting this problem.

how manny screenes are you running from the same source you might whant to look in to a distribution block

ex ; 1in 4 outs type of thing i had the same problem i have 5 screenes in my car  but when ever i had all 5 going the sunvisor ones would get muffled and distorted so look in to it good luck

my head rest monitors are clarion my in dash in clarion and my visors are nesa the only ones i have a probleme with are the nesa's  but i was runin allot of at the same 2 aux so i put a ex ; 1in 4 outs type of thing now it works

i dont knowabout nesa to mutch but i can tell you this "you get what you pay for" meaning all my clarions are fine and the nesa's arent try selling the nesa and upgrading your monitor to something elese

good luck bro