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4 steps to fix iPhone 6 Plus front camera unavailable

The front camera of iPhone 6 Plus is unavailable after dropping, but all other functions are normal, and you can switch freely between front camera and rear camera. The problem is when you use iPhone front camera to take pictures, it shows black screen.  This problem is generally caused by data hub. In this case, it is likely to be caused by the disconnection or iPhone CPU false welding.



Step 1

Disassemble and install a new camera, same fault phenomenon remains the same, the problem is determined on the iPhone 6 Plus motherboard.

Step 2

Power off the phone and measure the ground value of the camera interface, there is no any problems has been found, also the voltage needed for the camera is measured normally. This is a rare situation. If the CPU is false welding, the resistance shouldn't be normal, so there is almost impossible for getting a bad CPU.

Step 3

Test the interface resistance again, infinity is detected when the 19th pin AP_BI_FCAM_SDA_FONN is measured.  Many tests found that sometimes it's infinite, sometimes more than 500 of the resistance, but according to the data cable comparison found that under normal circumstances, it should not exceed 500. Measured valure on multimeter is as shown in picture 1



Tracing the source, it was found that the AP_NO_FCA_SDA_CONN was connected to the CPU by inductance, and the resistance of the 1 pin measured by FL1114 was normal. 

Step 4

After measuring FL1114's 2 pin infinity, we find that some inductance is loose, after sodering with phone rework station, 19 pin resistance become normal.


Finally,  assemble the iPhone, power on and test it, the front camera can take pictures normally now!

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