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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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In the maintenance, we are going to repair from the simple to the complex step by step

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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 switching pin voltage is normal

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The normal switch pin voltage is 1.5 to 1.8V

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Now let's measure the switch pin voltage

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When the mainboard is energized, the switch pin will have a voltage

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

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If the voltage is low when we measure it,

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and it doesn't trigger

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It means that the capacitor connected to the switch pin line is damaged,

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or the diode is damaged

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We can remove the capacitor and the diode

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For example, let's take the iPhone 6 and remove the diodes and capacitors from the wiring

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After that, we'll measure the voltage

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If the voltage is still low, that means the power supply IC is damaged

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After we replace the power IC, if the voltage is not normal,

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it means that there is a problem with the CPU

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CPU damage cannot be repaired

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and we can only return the machine to the customer

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No trigger maintenance process 5

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We have measured all the previous maintenance steps and found that they are normal

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It is possible that the power supply itself is damaged

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At this time, 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 the machine to the customer

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What about the maintenance process for the no trigger fault that's all we're going to talk about