My tv has power but doesnt come on . It is a samsung 52" lcd less than 2 yrs old

The issue has been resolved. I removed the back of the TV (pretty easy actually) by laying a blanket over the kitchen table and placing the TV face down. I started with the power supply as an obvious beginning. Both fuses on the board tested fine. And touched up every solder joint with a hot soldering iron in case the problem was a cold solder joint. After this painstaking venture, I performed another visual inspection and noticed a capacitor that had a thin black X on the top of the can. This is a common sign the capacitor has over heated. I located a replacement for $1.20, installed, and successfully powered up the TV. I have had no problems since.
Oh, yeah, I also paid $120 for a BN44-00150A replacement power supply, plus overnight shipping. It actually arrived three weeks later. That was two weeks and six days after I fixed the power supply myself.
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I had the same problem with my 52" TV, so i did a visual inspection on the power supply looking for black x's on top of capacitors. I could not find any, so I posted on fixya and got a response from another user who told me it might be the main board, to get it replaced. So to solve the confusion I called a sears tech to come down to check things out and he said that 2 capacitors were bad. It turns out that the 2 caps had slight bulging on top of the cans(no black marks though) I barely noticed it. So he charged me the fee of $100.00 and went on his way. I went to the electronics store to buy caps(10v 1000uf) for 50cents each. I installed them and the TV worked for about one hour and then all of a sudden the image went frozen. At first I thought someone hit the pause button on the tivo remote but the audio was still playing live with frozen image. I turned the TV off and on again and it worked. It has not had a problem since. Its going on about 20hrs of on and off use. We will see what happens.

Jimmy

Take it to a TV repair shop like Best Buy module problem or find a TV Shop that employs Electronic Techs decal on door says NESDA and only hires CET's . too many wannabees out there and they may spell problems. or find a authourized Samsung dealer.