There's a good chance you have failing electrolytic capacitors either in the power section or the inverter section or both. In your case, most likely the power section.
Any caps in this or any sections that look bulged at the top, or bulged/leaking at the bottom need to be replaced.
If you repeatedly turn it off and on, eventually it'll probably stay on, but every time you turn it off, the TV will get harder and harder to start up until one day it just won't.
Sometimes you have to do the opposite to start it up and unplug it for some time and then try again.
If you aren't tech savvy, don't worry, read the rest of this solution and watch the videos.
If you are handy with a soldering iron and can identify the power supply and inverter / FM section for the backlights, an inexpensive handful of capacitors will likely fix you right up.
Match the capacitance on the capacitors. Go over voltage if you can, and still have them fit.
IE - it's not a bad idea to replace a 10V cap with a 16V or 25V or even a 50V, but don't replace a 680uF cap with a 500uF or a 1000uF (unless you are positive it's only doing ripple filtering, and even then, you should go OVER, not under the uF rating).
Most of the caps that go are 10V 1000uF or 3300uF.
I found some great videos of the procedure (for many Samsungs with the same issue) on youtube.
http://www.youtube.com/watch?v=Mm51C_RDIZE
http://www.youtube.com/watch?v=BNHHrgX_6cs&feature=related
http://www.youtube.com/watch?v=8l0AUj8QUkg&NR=1&feature=fvwp
http://www.youtube.com/watch?v=Y7b_nTaZYcU&feature=related
As you can see, this issue spans plasma TVs, as well as large and small LCD TVs and monitors.
The parts are cheap, and skill required is minimal.
Ready light does not turn on and the camera does not work.
Turn on the camera (Turning on the camera).
Install new batteries (Loading the battery) or charge rechargeable batteries.
Turn camera off, then back on.
Ready light blinks green.
Camera is operating normally.
Ready light blinks amber.
Wait. Resume picture taking when the light stops blinking and turns green.
Ready light blinks red and camera turns off.
Install new batteries (Loading the battery) or charge rechargeable batteries.
Ready light glows steady red.
Transfer pictures to the computer (Transferring pictures with the USB cable), delete pictures from the camera (Deleting pictures/videos), switch image storage locations (
), or insert a card with available memory (Using an optional SD/SDHC or MMC card).
Wait. Resume picture taking when the light turns green.
Change the image storage location to internal memory (), or use a different card.
Ready light is off or glows steady green.
Camera is operating normally
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