My 40" Samsung LE400B651T is Only just out of the manufactures warranty and is playing up ! The screen / back light goes out after a few hours & will only come back on is the power is removed for about 6 hrs Is the back light separate from the screen or one unit ? Where can I buy one & how much would I expect to pay ? Comet want £300 to fix a £900 TV only 15 months old ???? Thanks in advance Liam

Hi liam, this is a common problem and quite easy to fix.
Unfortunately Samsung decided to use inferior generic power boards with their sets. They pretty much use the same power supply for the 32, 37 and 40 inch TV's. This is a great idea for production, unfortunately the power supply fails on the 40 and 42 inch models because of load. I find these power boards pretty cheap on Ebay and replacing them is a breeze. Just keep an eye out for the refurbished boards, since these have been beefed up a bit to compensate for the extra power drain.
My how-to is located here for LCD TV repair:

http://www.fixya.com/support/r4489343-flat_panel_television_repair_yourself