Fault Description: Water damaged caused the fingerprint fault.
Possibility sources reason: U1503 and J2118 R2160 caused the corresponding fault.
If the U1503 cause the voltage abnormal, maybe it will cause the fingerprint fault, more if the J2118 cooperating with R2160 caused the CPU fault, it also can cause the fault. So We need to disassemble it and find the sources fault.
During our testing, we found the FL2156 IC also happens fault, it was been corrode which caused the short circuit, so we should disassemble it carefully. Ok, let us start our final checking and fixing.
One circuit is U2100 output 1.8V voltage through FL2133 to the interface J2118, U2100 and FL2133 are easy to damage, it can be borrowed from another 1.8V voltage by connecting jumper wire to capacitor C2184. In addition, there is a 3.0V to be sent to the J2118 by FL2119, and FL2119 is easy to corrode and damage the fingerprint identification failure. The abnormal power supply of 1.8V and 3.0V will cause failure to open the fingerprint. These two voltages can be measured at the power on moment. U2100 is easy to damage which will cause the failure to open fingerprint function, short connection with jumper wire can be used.
If iPhone 6 fails to open fingerprint, first you need to use Fluke 15B+ Digital Multimeter to test whether the above mentioned voltage are normal, if several voltage are normal, then test if there is the situation of no voltage on iPhone 6 base, check if the corresponding resistance or inductance circuit get corroded or broken!
Avoid the water damaged maybe can save money for you. But if it really happened, just hold on, find the solve way and related article, learn to do it, you will be amazing it.
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