Upstar Model P250WT 19" LCD TV has no picture

[Captainclock]

Hello everyone, a few years back I had bought at a local computer store a 19" Upstar (cheap Chinese made unit) LCD HDTV for $120 and it worked pretty well for a while but then it decided to take a dump on me by not showing a picture anymore It will show its splash screen just fine but then after that it refuses to show the screen for the tuner or the video input sources, at first I thought it was a bad power supply (it uses one of those 12v 5A power supply bricks) so I had ordered a new one from parts express, but when I got the new power supply and hooked it up to the TV it still wouldn't show a picture.

Any ideas as to what might of happend to my TV, and what I could do to fix it? Or is it that I just need to toss it?