iPhone XS Max calls without sound fault repair

iPhone XS Max calls without sound fault repair

Machine model: iPhone XS Max
Fault phenomenon: there is no sound on the phone
Maintenance process: card insertion test, no one else can hear the phone call, and you can’t hear the sound. If the machine falls down, it first suspects whether there is pad break off in the middle layer.

iPhone XS Max calls without sound fault repair Figure 1.

Direct separate, found that pad break off.

iPhone XS Max calls without sound fault repair Figure 2.

Open Xinzhizao Soft to view the point and find I2S_AP_TO_BB_The point of dout has been dropped. This is the bus for communication between CPU and Baseband. It is used to supplement the point directly, and welding is used for test.

iPhone XS Max calls without sound fault repair Figure 3.

The function of power on test is normal and the maintenance is finished.