Two possible causes.
1. No signal input to the tuner.
2. Tuner fault.
Contact any service tech: to make it sure.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
SOURCE: Digital Visio 42" LCD TV stopped receiving digital TV
Check all your connections in the back, if they're all good replace the main board in the tv.
SOURCE: Vizio VA26L - Tuner problem. After approx. 6
Take the set and reprogram it where one of the other sets are ok. Digital signal is not so forgiving as analog, also place one of the sets that is receiving that station in place of the not receiving one. It's possible that the signal level at the bad spot is on the border line and that model can't hold on to it. You may also check visio's web site for any software up grade to your model that you may have to down load.
SOURCE: Sharp digital tv cannot receive digital signal
This television would benefit from an hdtv indoor outdoor amplified antenna not obstructed by trees, aluminum, bricks, and etc. Make sure the signal type is air and not cable and complete a channel scan during primetime tv hours after connecting to this antenna. Buy a large one that you can mount to the wall usually in a large flat box on the shelf in the store. Philips has one sold at Walmart.
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