Laptop asus k53, old.
When you turn off the laptop barely lights up the screen.
When the laptop, if the screen time goes out, you barely seen what was after shutdown.
If you separate off the screen with fn button, it is still - if in the dark you can see the image, you can run and see everything.
This degradation of the matrix? It is clear that the laptop is old, but it is interesting to understand why.