Wow... So I got the TV all wired up, was about to put it up on the wall to be finished and one of my solder connections came lose. Took the TV back down, re-soldered it and now the lights dont work.... >:(
However, if I wiggle the data cable near the arduino and/or plug/unplug it, some of the lights turn on with random colors. I know the lights have power because they all will turn on. Just seems like something is wrong with the data cable... Any ideas? Ive re-soldered that connection twice just to ensure that there wasnt a loose connection but even if the data cable isnt plugged into the arduino and i touch it with my finger, some of the lights will come on.
but even if the data cable isnt plugged into the arduino and i touch it with my finger, some of the lights will come on.
That sounds like the ground connection might be faulty.
It's been a few weeks now but I just wanted to send a quick update and thank you as I have officially got this working. I can't tell you exactly what changed since my last issue that cause it to work but I would guess that you were right and it was something to do with the ground connection.
The colors aren't perfect yet, and the LEDs could be more precise with the section of screen they are monitoring but for my first go at this I'm satisfied. Already received many compliments on it. Thanks again to everyone for your help troubleshooting the issues. I would not have been able to get this far without it! 
