No picture lcd

There are many parts damage cause the same problem.
No picture but you still see the video very blur on the screen. To find it, use flash light point to the screen you will see the picture there. Problem comes from the inverter board.
NO picture, no back light-stand by Led is on. Problem from the Power Suppy or from the Timing Controller.
The main board causes the same problem.
The worse case, the panel is dead.