iPhone 7 mobile phone earpiece has noise repair

Machine Model: iPhone 7
Fault phenomenon: The mobile phone earpiece has noise when recording video with the front Camera.
Maintenance process: The MIC on the front FPC is used to record the video and sound. The front FPC is replaced with the front FPC. The test failure remains unchanged. When measuring the front FP FPC of the main board, the 35th pin FRONTMIC3_TO_CODEC_AIN4_CONN_P Camera is found.

iPhone 7 mobile phone earpiece has noise maintenance Figure 1.

This pin is connected to the AUDIO CODEC IC chip through the FL2909 Inductor. When preparing to measure the back end of the Inductor, it is found that the Inductor is missing and is directly connected.

iPhone 7 mobile phone earpiece has noise maintenance Figure 2.

iPhone 7 mobile phone earpiece has noise maintenance Figure 3.

After supplementing the Inductor, the measurement of the diode value returned to normal, and the video playback with the front Camera did not produce any noise, and the maintenance was over.