46L5200U picture has no backlight but sound is present

Hello I have a 46L5200U whose picture stoped working, the problem started with a once and a while picture would vanish (volume is functional) but come back at some point; finially the picture stoped returning.
if i get close to the tv (almost nose to screen) and get to the right angle or shine light at the right spot i can FAINTLY see the menu and scroll through its options.
I read on one forum that it was the backlight inverter board so quickly rushed one to fix the problem, unfortionaly replacment of the backlight inverter board did not fix the problem.
is there anyway to diagnose the problem the television is not even 2 years old yet; should i take it to a tv repair shop? please help.
-JRW

About two weeks ago, mine started to do the same! I purchased at TigerDirect in May 2012 so it's only a year and a half old. At first, while watching TV, the screen would rapidly flash a few times and then it would go black. After turning the TV set off for a few seconds and then back on, the picture would be fine and stay on, sometimes for 15 minutes, sometimes for 2 hours or so, until it would flash again and then a black screen. Now the picture is not coming back at all. When I turn the TV on, the Toshiba logo comes on for a second and then the screen turns black. Using a flashlight on the screen, I can see a dim picture. Please help!

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46L5200U picture has no backlight but sound is present

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