Chosen Solution
I have a Samsung TV UA46D5500RR bought in 2011. Ii turn it on and shows samsung smart tv then turns off quick, then on, then off, and repeats itself till i unplug it. How can I fix it pls? I have removed the WIFI LAN adapter as well but still the same problem.
Most likely a problem with either the backlights or the PowerSupply - are you happy to take the back off of the TV and upload some photos of the boards in the back of the TV ?