iPhone 7 no signal service for repair

After iPhone 7 water damage, there is no signal. Clean the place of corrode, start test and repair the fault.

Machine model:iPhone 7

Fault phenomenon: after water damage, the mobile phone has no signal.

The customer found that there was no test process for the mobile phone repair signal.

iPhone 7 has no signal Figure 1.

Because the mobile phone water damage, powered on short-circuit current Ma, there is corrode on the mobile phone. After cleaning, it is found that part of Baseband has been measured and repaired by the owner.

iPhone 7 has no signal Figure 2.

Check Baseband power supply, found no problem, measure Diode value is normal,common failing place has also been processed, replace Baseband power supply, start Baseband normal.