My 65 inch Samsung tv is six years old. This morning right after I turned it on, it died. If viewed from an angle I see a faint flickering light whether it's turn on or off, so I plugged it. I can also see the blinking lights if peering into the back of the tv. While unplugged, I held the power button down for 60 secs. No change. It doesn't respond to any buttons on the remote.
If this does not help I recommend letting a service technician have a look. As we would like to gather additional information and look at this from a case by case basis please provide the full model code and the serial number of the device as well as your best contact phone number, name, and email.
