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iPhone 7 fingerprint Unlocking failure repair
Failure model: iPhone 7
Malfunction:fingerprint unlock failed, but unlock can be entered without returning.
Fault description: After repairing Baseband common failing, it is found that fingerprint did not return, but it can be unlocked.
Maintenance process:
Under the microscope, first observe the motherboard fingerprint BTB connector, and there is no appearance damage. Then, compare with Boardview, measure diode value one by one, and all of them are normal. Exclude Accessories, replace it with a new screen, and find that the return function is normal. Fix Baseband, lose a screen, unwilling. I started measuring fingerprint BTB connector of the old screen, and found Related circuit was also normal.At this time, it can basically be judged that there is something wrong with the main board fingerprint BTB connector. When the microscope is set to the maximum, it is found that there are four corners of the ground, all of which collapse. Use a scalpel to dial out and fix it.
iPhone 7 fingerprint Unlocking failure repair Figure 1.
