iPhone 4 front camera not working problem can be solved by tracing missing points on motherboard, some time this problem solved by changing Camera. Here in first diagram a resistor is marked just apply jumper or change this resistor.

iphone 4 front camera not working diagram

If problem not solved then check second diagram and apply jumper like diagram below.

Before disassemble mobile reset all settings or camera settings, or hard reset iphone 4 to its default settings.
Try this trick your own risk, we are not responsible any damage or fault.

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