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This is the device page for the Samsung Galaxy J7. The OS that comes stock to the device is Android OS v5.1.

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screen's flashing when turn off screen

When I turn off the phone's screen, the page starts flashing shortly, what to do with this problem?

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From what you have written I concluded that your display is broken and you need to replace it, here is some help:

Samsung Galaxy J7 Display / LCD Replacement

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factory restore, backing up your data for sure. if not might be a hardware problem.

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