Press the power button to turn on the phone. The phone turns on normally. Touch screen of the phone is unresponsive.

Turn off the phone and take apart it. Disconnect the battery and remove the display assembly.

Take out the motherboard. The first thing we do is to check the Touch ID FPC connector J5800. Run diode mode measurement of J5800. The measured value of Pin 22 is OL which indicates that Pin 22 relevant circuit has open-circuited.