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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.
iPhone 7 has no 4G signal repair Figure 5.
4G signal is normal, maintenance is over.
