Picture died, no display only sound. The TV died 18 months after purchase. I did not buy

Question

The TV died 18 months after purchase. I did not buy extended warranty. The technician tried swapping the motherboard but that did not fix the problem. Now the tech believes the LCD itself could be the issue. Does anyone have any advice here

I heard a pop and immediately the picture died, I still get sound. I have not tried any fix I am trying to figure out what went wrong.