Huawei mate 30 prowifi not available for repair

Machine model: 5g Huawei mate 30 Pro
Customer Description: the CPU has been redone, other functions are normal at present, the WiFi of mobile phone is not available, after checking all the places, no problem is found.

Test results: all functions of the mobile phone are normal and WiFi is not available.

Fault analysis: the previous master repaired the CPU, but no problem was found during the inspection. All the maintenance still focused on the previous repair.
Maintenance process: first of all, check the CPU repaired by the master and check the surrounding area, and no abnormality is found.Open Xinzhizao Soft software, find Huawei mate 30 Pro 5g Boardview, and measure the working conditions of WiFi chip according to schematic.

Huawei mate 30 prowifi not available for repair Figure 1.

Huawei mate 30 prowifi not available for repair Figure 2.

Huawei mate 30 prowifi not available for repair Figure 3.

Measurement found that the working conditions are normal, continue to check the WiFi chip signal circuit, especially the signal circuit connected with CPU.

Huawei mate 30 prowifi not available for repair Figure 4.

No abnormality was found in the measurement process. The signal circuit was not Open circuit and the line was broken.Capacitor ecking and repairing, it is found that there are two faults in the connection of the two CPUs.