Half of screen is dark. Dark backgrounds are very dark can't see barely any detail. Bright background better but poor image. At one point this would go away after TV power up for 10 min. Now stays all the time.
SOURCE: vizio gv47l lcd a popping sound and tv when dark and no sound
This sounds like a main board issue to me.
SOURCE: LCD TV picture screen very dark
I have the same issues with my Westinghouse LCD set. I've found that going into the settings (using the TV remote) I can get it back to a bright picture by selecting 'restore factory settings'. It is aggravating and a pain, but I can correct it.
It only seems to do it on the analog stations, not the digital (HD) ones, so maybe it will go away after the conversion next year.
Hope this works for you.
SOURCE: Vizio LCD dark screen and picture is flickering flashing
Your back light inverter is provably bad.
You can get get parts for this tv at www.interliquidparts.com
SOURCE: Dark lines appearing across my lcd tv
This is symptom of LCD Faulty. Please note down cost of LCD is much high. In my suggestion
you change or purchase new TV
SOURCE: Vizio LCD Green Pixels
Our Vizio started doing the same thing after only three weeks, except it was also showing green pixel when we watched DVDs. After checking this site and others and trying all the "tweaking" advised, I finally called Vizio's customer support. They were extremely polite and tried to help over the phone, but had to send someone to the house to make the repair (anything 40 inches or larger earns a house call). The tech arrived on time and was extremely professional and pleasant -- he had to replace the daughter board and LVDS cables. So far, so good.
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