Why does my Lumia 435 have a vertical line?

[Windows Central Question]

My Lumia 435 had a charging problem before. I went to the service center and they replaced with a new one. But now I have a new problem. There's a vertical line. When I lock the screen after few minutes of usage, I see a small white-like line in the bottom of the screen. Then after using it for few more minutes, I see that white line on the top of the screen also. Then after locking the screen and unlocking it, finally I see the Black Vertical Line in the middle of the screen. It becomes wider when I lock it and unlock it again. I'm very surprised that this new replaced mobile has a problem. Please help

 

[gpobernardo]

You may want to bring that phone back to the service center. Show them what is happening with your screen. That should prompt them to find another replacement for that phone.

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