White screen means that the video signal is not getting from the vga board inside the monitor to the actual lcd screen panel.
It may be a bad vga input board (also called a main board)
OR
It could be simply a bad connection on the wiring harness that connects this board to the lcd panel
Or
it could be a blown fuse on the board on the board that is permanently mounted to the back top of the lcd panel.
I would check the wiring connection to the lcd panel inside the monitor first
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