iPhone XS Max won't turn on for repair

iPhone XS Max won’t turn on for repair

Machine model: iPhone XS Max
Symptoms:water damage no booting Maintenance
Maintenance process: Press the power button without any response, insert lighting cable into Recovery mode, there may be a system problem, or it may be brushed by the machine, but the problem is locked on the power button side, and remove the motherboard.

iPhone XS Max won’t turn on for repair figure 1.

Connect DC power supply, turn on the key contact with tweezers switch, and there is no current response, indicating that the problem is on the motherboard, and turn on the key contact BTB connector diode value.

iPhone XS Max won’t turn on for repair figure 2.

Only 103 is obviously wrong, and the normal value is several hundred.diode value is so low that VCC definitely doesn’t have it. Observe under a microscope.

iPhone XS Max won’t turn on for repair figure 3.

No abnormal phenomenon was found on the start button BTB connector side, so open Xinzhizao Soft drawing.

iPhone XS Max won’t turn on for repair figure 4.

See from J4300 through an anti-staticdiode; the one who lacks dialectical thinkingDZ4310 filters Capacitor to the main power chip through R4310 resistor and a C4310 filter. The first consideration is the anti-static diode, which is directly removed.