thick white line on the left side of the screen

When I press the F1 key to darken the screen completely, the whole panel go dark.

One thing that I've not mention is that the white band make a little flicker

Do you think is the LCD?

Thank you very much

Hi! Yes, it still sounds like the screen. However, I'd still try opening an closing it slowly to see if the problem goes away at a certain angle. Before you buy the screen I'd open up the screen hinge and make sure the cables are not being crimped (try powering on with the hinge open, and the cables stretched out). It couldn't hurt to re-seat the video cable on the back of the screen, and on the side of the logic board as well. While these tests are mostly unnecessary, a new 17" screen is expensive, and so they may be useful as far as removing any doubt that it is the screen itself...there's a 99.9% chance that you just need a new screen.