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black sreen but still able to open navigation/notification bar

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Android Central Question

recently I just got my hisense l676 back from my brother, but sometimes the screen just appear black, but I still able to open the navigation bar and yes its appear on screen (not just sound or vibration), also when I holding the power button the option to turn off the phone appear, but the screen behind it still black
my brother said he was messing around with phone system when trying to root it, so I flash it using stock rom I found on the net, but the problem still there, how can i fix this ?

oh and sometimes the phone touch screen "tap and hold" by itself at top of the screen, its no longer frequent after flashing and can be fix by locking the phone and unlock it but sometimes its annoying.