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Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electro-medical.blogspot.com/ http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced.
The bulb that lights your picture is burned out. Buy a new warranted bulb from shopjimmy.com $85 with the housing. You can replace this yourself in 5 minutes. Shop jimmy has a video showing replacement. Remove 2 screws that hold the housing in place, slide the bulb out and slide the new bulb with housing in and replace the 2 screws. Plug in and enjoy your tv.
Get real close to screen and maybe use a flash light to shine on the screen and see if you can see the picture still, it will be dark and almost not visible but you should notice something move. If your screen has picture then you most likely have a back light problem. Most common problems are bad inverters, or the inverter controller card. possibly a bad power supply but most likely inverters, test each circuit, replace as needed.
when you replace the door, after you have reinstalled the lamp, make sure that the button inside the television cabinet is being pushed in by the door. i had the same problem when i first replaced my bulb.