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iPhone trigger circuit

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In this video we're going to learn about the no trigger repair process

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Step 2 of the maintenance process

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After the wiring is eliminated,

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we can measure whether the diode value of the switch pin is normal

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to eliminate the short circuit or open circuit problem

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If we measure the value is low,

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it is generally the capacitor connected to the line is bad, or the diode is bad

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After the elimination of capacitors and diodes,

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if the value is still low, it indicates that the power IC is damaged

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The repair method is the same for all iphone 7 and older models

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Let's take the iphone XS model as an example to measure

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First of all, the multimeter to diode gear,

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red pen ground, black pen to measure the switch pin

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Normal resistance is about 550

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If the value is 0, it indicates that the diode connected to the line is damaged

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or the capacitor is damaged

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After removal, it is not normal, it means that the power IC is damaged

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We can look up the diode, capacitor and power IC connected to the line in the bitmap

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After clicking the switch pin,

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we can first see the connected anti-static diode DZ4310

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After passing the safety resistor R4310, it connects to C4310

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DZ4310 and C4310 will result in low switch pin values

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If the value is still very low after removing these two components,

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it indicates that the power IC is damaged

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If the measured value is high,

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it means that the safety of the line connection is broken,

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or the layer is broken

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Because what we measure is the value of the chip

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If the circuit or fuse between the switch pin and the chip is damaged,

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it will result in a high value measured

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So let's do this

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If OL is displayed during measurement,

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it indicates that the safety of the line connection is bad or the layer is broken

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After we click the switch pin,

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we will find that the pin comes and connects to R4310

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R4310 is the safety resistor for the switch pin

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After it passes the resistor, it is connected to the power supply IC

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If the resistor is damaged, it will result in a higher value

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At this time, how do we determine whether the fault is caused by the resistor damage?

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We only need to measure the end of the resistor connected to the power IC to see if its value is normal

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If the value is normal, it means the safety resistor is damaged

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If the value is abnormal,

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the cable between the resistor and the power IC is disconnected

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At this time, if we want to repair, we can only take off the power IC,

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fly a wire from the pad to the resistor

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Then weld the power IC onto it

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So that's it for this lesson