Today morning when I tried to switch on my TV it started behaving in an awkward manner. The screen started flickering continuously. It switches on & off 2 times per second. So if I try to switch off, either using the remote or by pressing the ON/OFF switch on the TV, it refuses to switch off. I have to switch off the power button on the wall, where I have plugged in my TV power cable, to switch off the set. I have tried replacing the batteries of my remote, used another remote, tried to factory reset but nothing seems to work. I have 3 HDMI cables going inside the HDMI IN of my TV, viz, HDMI of my Tata Sky STB, HDMI of my Blue Ray player & HDMI of Android TV box. I have pulled out all 3 of these cables and tried switching on the set but this also doesn't seem to work. This is a Samsung 3-D LED 55 incher, 2013 model. The exact model as per the user manual is Samsung 55F8000 3D.
Can the experts tell me what could be the issue with the TV?