Einleitung
If your screen went black while using the front camera and performing a hard reset and software update did not fix this problem, replacing the front camera may solve these problems.
Werkzeuge
Ersatzteile
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            Use the small suction cup to lift the back panel: 
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            Press the small suction cup on to the middle of the back panel. 
 
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            While holding the Sony Xperia Z ultra down with your left hand, slightly pull the small suction cup upwards to create a small opening between the back panel and the front panel. 
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            While continuing to pull the small suction cup upwards, insert the spudger in the small opening. 
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            Pry the front panel downwards with the spudger while continuing to pull the small suction cup upwards. 
 
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            Remove the following six screws with a Phillips #000 screwdriver: 
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            five silver 2.1 mm screws 
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            one gold 3.1 mm screw 
 
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            Pry the plastic motherboard shield open by placing the spudger under the shield and running it along the edges. 
 
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            Insert the spudger underneath the battery and run it back and forth to remove any adhesive. 
 
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            Pry the connection upwards from the motherboard with the spudger to reveal the front facing camera. 
 
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To reassemble your device, follow these instructions in reverse order.