My TV screen has 1 black vertical line

When my TV start get faulty, it get 1 black vertical line on the left of the screen from top to bottom and will expand slowly as time pass. And now my TV’s one black vertical line turn from black to many bright colored vertical line and 2 big black spot on the bottom of the line and the screen will flicker with white. What is the issue? Can i fix it myself?

It is a Samsung Curved LED Smart TV from 5 years back.