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How to Fix black screen error on samsung galaxy

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On the other hand, many users have noticed that your Galaxy S4, after upgrading to Android 4.4.2 KitKat unexpectedly shuts down. Once black screen, users can unlock it again without any problems, but this error is quite annoying when you are working with the mobile screen. 
 
 
The solution to this error is very simple, just go to "Settings" and then the functions of "Screen lock". Within the option of "Lock screen widgets", choose "Personal Message" or "Clock" and then select "Clock". This problem of the black screen fix.
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Prepare the phone for the hardware factory reset process by performing a battery reset and pulling out the memory card. You can remove the back panel by pulling on the indentation near the power button. You can leave the SIM card in the device. After you've closed the device, plug it into the charger to avoid losing power during the reset process. To initiate the recovery menu, boot the GS4 by holding the "Volume Up," "Home" and "Power" keys. On the "Recovery" menu, use the volume keys to select "Wipe Data/Factory Reset." Then press the "Power" key to initiate the hardware factory reset. For more details you can check at Samsung India site in its support option.

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