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iPhone trigger circuit

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In this lesson, we will learn about the no trigger maintenance process

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No trigger maintenance process 4

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If the previous steps are normal,

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we need to measure whether the switch pin voltage is normal

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The normal switch pin voltage is 1.5 to 1.8V

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Next, let's measure the switch pin of the iPhone 12 mainboard

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First of all, we connect the power supply

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The black pen is grounded and the red pen is used to measure the switch pin

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We can see that the switch pin voltage is about 1.75V

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If we measure the voltage, the voltage is low,

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and it doesn't trigger

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It means that the capacitor connected to the switch pin is bad,

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or the diode is bad

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We can remove the capacitor and diode

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For iPhone 11 and 12 series models, the capacitor,

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anti static diode and inductor connected to the switch pin are integrated together

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This is a drawing of the iPhone 12

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The inductor is integrated with a capacitor, an anti static diode and a safety resistor,

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three of which make up the component

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When capacitors and diodes need to be removed,

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the entire component needs to be removed

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After we remove it, we need to shorten the first and third pins

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We can see its structure in a bitmap

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In the bitmap, the switch light pin is only connected to the FL10130

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The capacitor and the anti static diode are inside this assembly

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When we remove the capacitor and diode,

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we need to remove the whole small component

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After removal, it is also necessary to short connect the first and the third pins,

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otherwise it will cause the line break, and also lead to no trigger

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Let's take a look at the actual picture

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In the physical image, this element is below the switch seat and is black in surface

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We need to remove it in the actual maintenance,

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but also need to short connect the first and third pins

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After processing, we measure the switch pin voltage

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If the voltage is still abnormal, we need to replace the power supply

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After replacing the power supply, if the voltage is not normal,

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it indicates that the CPU is damaged

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If the CPU is damaged, it cannot be repaired

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We can only return the machine to the customer

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No trigger maintenance process 5

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All the previous maintenance steps have been measured and found to be normal

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At this time, the power supply itself may be damaged,

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we need to replace the power supply

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If it does not trigger after replacing the power supply,

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it indicates that the CPU is damaged

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and we can only return it to the customer

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So that's all for this lesson