How do i optimise the picture on my 46in samsung led television

If a new set it is somewhere on the back. Check your manual for exact location.

try this on go to http://televisionintips.com/What-to-do-when-Samsung-UN46C5000-TV-turns-on-and-off-by-itself/ and follow the procedures listed for factory resetting...

Hi Michael.

I would contact Samsung...
http://www.samsung.com/us/support/contact
Helpful Not Helpful

Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and precious time.

You must go on line to SamsungUSA to get their manuals in PDF format. Then again...get Adobe,com "READER" to open the data package.

If you have a conventional set, it sounds like you might have cold solder joints around the Horiz Driver Transformer. It's not the large one--the small one.