Hi ladytuts.
One reason may be that you don't have the tv plugged into a surge suppresor. If you don't have one, its advisable to get one, as lcd's/plasmas are quite susceptible to small power spikes.
Try unplugging the tv for one hour, then plug it in and see if the tv corrects its own issues.
If that does not resolve the issue, pay attention to the number of times the power light blinks before shutting off. Thats usually a 'fault code' for troubleshooting a more indepth problem with the machine.
SOURCE: tv keeps shutting off and going back on by itself
Faulty parts on PS board , bad press for Samsung
When checking the capacitors, If they are slightly rounded on the top where the X is, the cap is defective.
Because the Samsung LNS4051D would not turn on and the power
LED would blink 4 times and the relay would click and this
would repeat again and again. I replaced power supply board
parts CM806, 811, 812 & 817, all 1000 uf 10v capacitors,
three had their tops bulged up slightly that I missed on
initial visual inspection. After seeing the reports of
problems with these caps on
http://www.fixya.com/support/t1336881-will_not_turn_or_off ,
I replaced them with Radio Shack part 272-1032, 1000 uf, 35v.
They are slightly bigger, but fit OK. TV is working fine now.
Cost was 4 x $1.59 = $6.36 plus the time. I saved between
$100 to 300 in the process of either replacing the board or
getting the unit serviced. If you are not comfortable
replacing components which means using a soldering iron, you
can replace the power circuit board, available from
www.Samsung.PartStore.com.
Some UTube showing the problem and fix
http://www.youtube.com/watch?v=tK7zFBBU6p4&feature=related
http://www.youtube.com/watch?v=Mm51C_RDIZE&feature=related
http://www.youtube.com/watch?v=BNHHrgX_6cs&NR=1
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