iPhone XS Max phone screen is not displayed intermittently for repair

Machine model: iPhone XS Max
Customer Description: mobile phoneThe screen does not display intermittently
Test results: all functions of the mobile phone are normal, but the screen will not display intermittently.
Fault analysis: the fault should be caused by abnormal display of BTB connector connected line.
First replace the screen test, after the test found that the fault is not repaired.
Open the Xinzhizao Soft software and find the annotation map of iPhone XS max,Boardview and schematic.

iPhone XS Max phone screen is not displayed intermittently for repair Figure 1.

iPhone XS Max phone screen is not displayed intermittently for repair Figure 2.

iPhone XS Max phone screen is not displayed intermittently for repair Figure 3.

Find the display screen BTB connector and measure each pin bit diode value of BTB connector.BTB connector,pin, PMU_TO_DISPLAY_RESET_CONN_L line diode value unstable, it is determined that the line PCB layer has been broken.