iPhone 7 has no 4G signal repair

iPhone 7 does not have 4G signal, replace tddpa_After RF power amplifier, the fault was repaired.

iPhone 7 has no 4G signal repair

Machine model: iPhone 7
Fault: the mobile phone has no 4G signal
Maintenance process: after replacing the frequently broken chip xcvr0, the problem is still the same. Often check the drawings and simply outline the receiving and sending process of 4G signal.

iPhone 7 has no 4G signal repair Figure 1.

iPhone 7 has no 4G signal repair Figure 2.

iPhone 7 has no 4G signal repair Figure3.

iPhone 7 has no 4G signal repair Figure 4.

As can be seen from the figure, replace the tddpa_RF, power on test.

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iPhone 7 has no 4G signal repair Figure 5.

4G signal is normal, maintenance is over.