Anyone know how to fix a screen with horizontal gray lines across it?

[Burns447]

System:
Battery or AC:
Model:
Frequency of occurrence:
Reset OS:
Screenshot or video:
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Detailed description：

[Blake_ASUS]

Hello Burns447,
May you specify your model and the describe more about the issue scenario?
Thank you.

[Burns447]

The model number is C434T. It worked great and the screen still works, but now it has vertical lines across it?

[Blake_ASUS]

Hello Burns447,
the grey lines were there all the time or just flickering from time to time?
And the issue happen out of a sudden or was there any update or modification?
May we have a picture of the issue?
Thank you.