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The reason your phone interior and exterior screen went black is because there is a problem with the flex of the phone.
The flex is the mechanism like a ribbon that connects the screen to the panel of the phone.
All you have to do is to replace the flex of the phone.
To replace it on your own, the process to do this are as following;
Get the appropriate screwdriver (Torx 5 screwdriver).
Remove the four rubber stoppers surrounding the screen to reveal
four screws. Remove these screws.
You can now remove the front cover. To do this, use a credit card to
lever the cover up. The cover clips on and the levering motion will
unclip it. Start at the top, then unclip the cover at the bottom, then
Now detach the camera from the phone. Simply pull the ribbon away
from the phone to release it.
Now unplug the other ribbon.
The ribbon attaches like a plug and socket. Simply lift it up to unplug
The ribbon you just unplugged is the flex of the phone, so you have to unscrew the lower part of the phone to remove it completely.
To open the lower part, you have to open the back cover and remove the battery,
Unscrew the screws you see, than split it open with a credit card or the tip of your finger, apply a little force to open it.
Then unscrew the board, you will see where the other end of the ribbon is connected on the board, then you can remove it and fix a new one.
Reverse the process to reassemble the phone together.