My brother had a Vizio D650i-B2 with a blue tint to the screen image. This typically means the LED strips are going bad and need replaced. This repair took about 3 hours because of the size of the TV but hey I got a Sega Saturn for my labor so I am happy!
This is what a bad LED strip looks like (the black one):
I did not make a walkthrough on this it is basically tedious because you have to take apart EVERYTHING. Be super careful when removing the panel, if you break that it is game over.
Here was my living room as I was taking it apart:
