Hello, I'm Shahid.Sorry to hear that you're having trouble with this but I'll do my best to help.
Is the crack on side of screen appear on all video inputs or when TV menu screen appears?
Can you provide me a good picture of TV screen to see that crack which will help alot to diagnose the issue.
Thanks tony for the pictures that helped a lot. Unfortunately it is display panel/ screen damage and screen replacement would cost approx new TV price of same size so you would be better off with a new TV instead of spending time and money on this one's repair.
Replacement display panel/ screen costs approx 90% of entire TV and if you add TV tech labor than it could exceed new TV price. I'm sorry about it as flat panel TV manufacturers intend to sale more TVs instead of repair a sold TV. I hope these info will help. If you have any additional questions, feel free to ask. If you're satisfied, please rate me a 5-star at the top of your page. Thank you.