As a professional phone repair man, we like to DIY, but same time we also want to record those experience, then it will be a memory when we get older...
Today we will share some skill for about the phone fingerprint and home button fault.(tips: with the professional phone schematic diagram WUXINJI Dongle, half the work with double results, right?)
iPhone 7/7P fingerprint repair guide
The fingerprint power supply schematic diagram is as follows:
The iPhone power IC output PP3V0_MESA(3.0V) PP1V8_MESA(1.8V) respectively through inductance FL3803 and FL3801, next send it to interface J3801; the iPhone power supply IC-- U3702 output PP16V0_MESA(16.0V), after inductance FL3802 delivers to the interface J3801.
If these three circuits power supply is abnormal, it will cause iPhone fingerprint failure. In order to fix it, you can check the short connection FL3803, FL3801 and FL3802, Use Precision Titanium Alloy Tweezers to replace the U3702.
iPhone 7/7P home button repair guide
The home button power supply schematic diagram is as follows:
The power supply pipe U3801 output PP2V75_MAMBA(275V) to J3801, iPhone power IC output PP1V8_TOUCH(1.8V) , through resistance R3805, final to J38011.
If these two circuit power supply is abnormal, it will cause iPhone home button failure. For repairing this problem, check short connection R3805, and then you can replace the U3801 or disassemble the U3801, and then use PPD 861D Plus hot air rework station to weld the jump wire from C3813 to C3823.
With the professional phone repair tool and guiding, it will be much useful for your repair work, no matter what we shared, we hope everyone can enjoy the DIY Phone.
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