Fault Description: iPhone 6S happens ringtone function faults.
Actually, we will be habit to check the control IC customarily, following the details step by step:
First of all, we install the iPhone 6S motherboard to test whether there is any vibration without bell, because ringing and vibration are closely related.
It is found that the vibrating bell is not entirely absent, there a little sound just click it, then the sound disappeared at soon.
For this kind of situation, we can give priority to check the iPhone 6S bell boost in this respect, observe under the LED Stereo microscope, we found the L3700 bell boost a little blackened.
The picture are shown as as follows:
Picture 1
Picture 2
Solution:
Replace a new L3700 coil, install the iPhone to test again, the ringtone fault is perfect solved now! (general coil without direction and model difference, can be commonly used)
After that, we advise you guys had better use it carefully
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