When turn on this lcd only picture flasher a few second and then picture go to black the light green into front panel is on

Sounds like main board fault. Contact any service technician to confirm. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/

Consider having it repaired as it should be in warranty.

Sounds like maybe power supply, but I would check with flashlight 2 in from screen when the green light comes on to see if you have a picture, if so then you have a bad inverter board, if not then power supply problems. You can look for bad or bulged caps in PS

i have the same problem. i just replace the power board because of the "green blinking" light. now, light stays green, picture comes on for a few seconds, then blank....

did you fix your problem.

do you still have this tv. please call me at 214 374-6844

Someone else gave me the tip as I had the EXACT problem, but no buzzing. Unscrew the panel on the front bottom of the tv. Once that is off, there is another screw that opens a little panel. Unscrew the single screw with an allen wrench and pop out the bulb and casing. Mine was full of dust etc. Used an LCD cloth, but compressed air would do the same thing, put it back together and it works great!

check if the back lamps are still on when you lose image, all you have to do is get close to the screen and make is totally black and if is not that means you have a back light working, but if the back light is gone you may have a defective panel.

talked to samsung TA about the same problem I had and the recommend to replace the power supply first to confirm a defective panel because a panel is quite expensive

since when have you experienced the problem? does the tv still turn on or not...?

I had the same exact problem.
I removed the bulb and cleaned it. There is a small screen at the top of the bulb and it was covered with dust. Once it was cleaned I replaced the bulb and it solved the problem.
Thanks to those who posted the solutions