iPhone 7 has no voice repair

Machine model: iPhone 7
Malfunction: I repaired the screen and signal problems before, and suddenly found that the phone had no sound.
Maintenance process: when the system is turned on, there is no sound when it is played out, and there is no response when calling siri. When the recording function is turned on, there is no response. Basically, it can be judged that the problem is AUDIO CODEC IC.

Dismantle the main board and repair Baseband. After removing the AUDIO CODEC IC chip, there are several missing points. Look at the missing points according to Xinzhizao Soft drawings.

iPhone 7 Mobile phone has no sound maintenance Figure 1

These points are all useful, one by one Jump wire. After the repair, find a new AUDIO CODEC IC chip and install it. After the power-on test, the call and external sound will return to normal, and the fault will be repaired.