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After the iPhone 7 fell, the signal is difficult to repair
Machine model: iPhone 7
Fault: The cell phone signal is not good.
After the iPhone 7 fell, the signal is difficult to repair Figure 1.
Fault analysis: The signal of the dropped cell phone is not good. It is likely that the chip or PAD dropped pad break off.
Maintenance process: all the test signals can appear normally, that is, after a while, the dropped line becomes no serviecs, and then it is recognized that the operator signal is normal again, and this is repeated. Observing the deformation of motherboard under microscope,shielding cover in Baseband CPU position is cracked.
After the iPhone 7 fell, the signal is difficult to repair Figure 2.
It is likely that Baseband CPU dropped pad break off. Remove shielding cover,Baseband CPU, and find pad break off dropped.
After the iPhone 7 fell, the signal is difficult to repair Figure 3.
Handle PAD properly, and make up the dropped Jump wire.
After the iPhone 7 fell, the signal is difficult to repair Figure 4.
Reballing c13001 CPU, soldered back to the motherboard. After installation test, the signal returns to normal, the function is normal, and the maintenance is finished. This fault is caused by Baseband CPU pad break off.
After the iPhone 7 fell, the signal is difficult to repair Figure 5.
After the iPhone 7 fell, the signal is difficult to repair Figure 6.
