There is a strip with a gradient on the screen, who is to blame?

Question

Iron

There is a dark band on the screen with a gradient from the right edge. Loop problem? Lamp? Attaching photo.

Answer 1

Something similar gives the bend of the screen. but the gradient is usually a color one.
with a lamp as soon as possible. the train gives clear, usually thin lines.

Answer 2

There is definitely no lamp there, a matrix with ice backlight.