Thats in most cases by Samsung 1 answer try first to make a capacitor rolling in high priority first on the power supply in any case and the backlight inverter but on some other places also.

The t con board or the LCD panel is faulty. Can confirm by replacing the Tcon boar.

If you wish to get some details; check the site linked here. Pull up older posts.
http://electro-medical.blogspot.com/