HP 19bii Problem with the screen

[math7]

(09-05-2018 07:28 PM)Robert VM Wrote:  May be the adhesive of the reflective surface or the polariser at the back of the display.
Perhaps it's been in the sun for too long?

Good luck!

Actually I do not know why I bought it in the business that had it on display. I do not know if it fell and hit some time, but you can see that it is below the display, what I do not know is if this is a plastic protector or is the same display or there is another layer below, I was thinking about applying heat with a gun of heat to see what happens.