Today afternoon a strange thing happened. The TV powered on but I could see nothing on screen. Sound was present. Realized that display has gone extremely dim and used a flashlight to confirm. The TV had indeed powered on but no led backlight possibly had gone kaput. With a lot of anguish and disappointment , called the local Mi service guy and told him of the problem. He said could be a led backlight issue. He said he would send somebody.
Disconnected everything after sometime and power on and the tv came to life. Not sure what had happened. Would keep a close watch . I hope this doesn't repeat again.
For the time being looks like a rogue power connector from my surge protector