iPhone xs touch inoperative repair

Machine model: iPhone XS
Customer description: The mobile phone is not touching properly.
Test result: The mobile phone doesn’t touch well.
Failure analysis: The touch of the mobile phone is ineffective, and the general situation is that the touch circuit is abnormal.

First, replace the test screen for testing. If the fault persists, the fault lies on the motherboard. Open Xinzhizao Soft software, find the component labeling drawing of iPhone XS, open Boardview of Huawei iPhone XS, and find the touch BTB connector.

iPhone XS touch inoperative repair Figure 1.

iPhone XS touch inoperative repair Figure 2.

Measure the diode value of each pin bit, and refer to the diode value data of Boardview as reference. If the actual measured diode value differs greatly from the reference value, it is proved that the components connected to the line are working abnormally or damaged.
After measurement, it was found that one line diode value is OL, that is, the line has been disconnected. Since the line is connected to the middle layer, only separate,separate and then separate can be used to repair the disconnected line, and then welding can be used to repair the fault.