How to repair screen

The issue with TVs isn't that they can't be repaired; the LCD usually costs as much as an entire TV :/. Even when the TV is current, the panel tends to be a "total loss" failure.... It gets worse when they become last year's model, without fail. Unless it's an LED array failure you can recover from with a set of donor strips, I've never seen anyone successfully repair a TV with panel issues.

Your best bet is to take the TV apart and look up the panel number; you might get lucky. That said, TVs are generally not cost-effective for panel replacements, and you're usually better off selling the parts that still work to offset the replacement cost.