Sound, backlight can be seen thru back cover but no picture

Sound, backlight can be seen thru back cover but no picture Vizio VT420M flat scren TV would come on with a "fuzzy color" then be okay after a few minutes. Now, I get only sound no picture. As I said, I can see the back light thru the back cover vent slots. Tried the flashlight tet but really couldn't see anything. ANSWERS:
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