iPhone 7 Plus can't make a call

iPhone 7 Plus cannot make a call

Machine model:iPhone 7 Plus

Fault: the customer said that although his iPhone Plus had been used for several years, he often couldn’t make a phone call recently.

Repair process: after receiving the customer’s iPhone 7 Plus, the test mobile phone displays no serviecs and no SIM.This is a common problem with the iPhone RF series tuner.

iPhone 7 Plus cannot make a call Figure 1.

iPhone 7 Plus cannot make a call Figure 2.

iPhone 7 Plus has Baseband no serviecs, which indicates that Baseband is working normally. Because there are many broken RF ICs in iPhone 7 series, so disassemble the motherboard and replace the RF IC first. The single board does not jump card during startup test, thinking it has been repaired. The results show that no serviecs is displayed after installation.

iPhone 7 Plus cannot make a call Figure 3.

Remove the motherboard, there is no such problem. At this time, it is found that the problem is Accessories. After eliminating Accessories one by one, it is found that there is a problem with the ANT tuner. Replace it with an ANT tuner.