Sony India — defect of led tv

I have purchased a Sony led 48 inches TV on 23rd August 2016 and about 15 days ago from now it just stopped working. It was working and some time the screen just became black, sounds were coming but the picture was not available.I called Mr.Rana the Sony technician he saw the TV and said the mother board is defective today he arranged a motherboard form dhanbad service centre and then he fitted the motherboard but the picture did not come he now said that the screen is defective and it will take another 10 to 15 days for the screen to bee replaced and it will cost about 18 -20 thousand. Since I purchased this TV as I knew Sony is the best brand so now I am very much depressed because in a very short interval of 2 and half years my TV is not working please arrange as soon as possible so that my led tv get repaired as soon as possible at the minimum cost. Nitesh Deo . Giridih . Jharkhand.