Hi just want to check, you mean you have taken a screenshot and view it on another phone or on the same phone?, if you view the screenshot on another phone then it means that your lcd is faulty, provide us more info and maybe we can isolate and narrow dont the issue, hope that help, cheers!!
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== Update ==
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Hi so based on your answer, it is the lcd that is faulty because when you view it o another phone there is no gray line, hence there is gray lines only on the phone that you are using, changing the lcd should solved the issue
Hi just want to check, you mean you have taken a screenshot and view it on another phone or on the same phone?, if you view the screenshot on another phone then it means that your lcd is faulty, provide us more info and maybe we can isolate and narrow dont the issue, hope that help, cheers!!