This may be due to some software issue.i suggest you to reset your phone that will solve any kind of issues facing with your phone.I have my phone where my display went black, and i performed the below steps. You can even try this Press and hold the combination of the Power key+ volum up key+ Menu key when the phone is off. When it enters the boot loader mode of teh phone use the volume key to scroll --> select wipe data and factory reset --> select yes and wait till the phone reboots.
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This may be due to some software issue.i suggest you to reset your phone that will solve any kind of issues facing with your phone.I have my phone where my display went black, and i performed the below steps. You can even try this
Press and hold the combination of the Power key+ volum up key+ Menu key when the phone is off. When it enters the boot loader mode of teh phone use the volume key to scroll --> select wipe data and factory reset --> select yes and wait till the phone reboots.