Very weird issue with my P55-C1.
I've been having a problem with mine for over 6 months now where the backlight will not come on with the TV sometimes. I have to unplug the TV, hold the power button for 30 seconds and then plug it back in, and pray that the backlight comes on with it. It will come on with the Vizio symbol, and then will show the input details at the top like usual, but will slowly fade out into nothing. The only way I know the TV is still on is because the soundbar is active. And if I look at the screen from a certain angle I can still see the pixels and stuff.
So now what I have to do at night is leave the TV on WatchFree, and then hold down the mute button, which turns off the screen but keeps the TV on. And when I wake up in the morning I press Exit and the screens comes back to life. If for some reason I forget to put it on WatchFree, 10 minutes later the TV actually turns off, and I have to go through the process all over again.
Other than what is stated above, the TV works absolutely beautifully. I've had it for almost 3 years now.