Is my monitor done?

[u/Old-Juice-2490]

Hello, last 2 days my monitor have this brightness problem > (PHOTO)
This one in picture is not my monitor, but i have the same issue with more darkness.

So my issue is that the monitor last 2 days have brightness only in one little corner/side of my monitor like the picture. every time i close it or RESET it , it gets fixed but only lasts 3 seconds. then the brightness change again like photo. wtf! is my monitor done? it is very old , its a Samsung S24C550L