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iPhone trigger circuit

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In this lesson, we will learn how to measure the switch pin voltage and standby power supply

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Let's take the iPhone XS model as an example

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We first find the switch pin

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In the bitmap, find the iPhone XS power-on measurement point

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According to the mark, let's measure the switch pin in the real thing

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First, we buckle the boot cable to the mainboard

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Black pen grounding, red pen measuring switch pin

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At this time, we can see that the switch pin voltage is about 1.76 volts

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Now let's measure the standby power supply

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Let's start by opening the bitmap on the iPhone xs

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Select the Find button in the bitmap,

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select the search signal,

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enter PP1V8_ALWAYS, and click Search

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After searching, the yellow dot in the bitmap is the measurement point with standby power supply

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We connect the power supply cable

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The mainboard of xs needs to be layered to be measured

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We have already layered this mainboard

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We connect the black pen to the ground, and take the red pen to measure

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At this point, we can see that the voltage is around 1.8V

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So that's all for this lesson