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iPhone trigger circuit

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In this video, we're going to learn about the trigger circuit failures

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Trigger circuit common fault phenomenon is not triggered, or do not start

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No trigger means that after the mobile phone mainboard is connected to the power cord,

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when we press the power button,

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the current on the adjustable power supply does not change

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For example, in the picture, after we switch on the power supply,

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we use a tweezer to trigger the switch,

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and the current of the adjustable power supply did not change

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This fault is no trigger

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Normal mainboard, when we connect the power and press the switch,

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the adjustable power supply will show the current

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Let's go to the real objects to check the failure of no trigger,

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we take the iPhone XR mainboard as an example

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First let's look at the trigger process of a normal mainboard

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After the normal mainboard is connected to the power cord,

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the adjustable power supply doesn't show the current

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When we trigger the switch,

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the current will be displayed on the adjustable power supply

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This phenomenon is normal

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Next, let's look at the failure phenomenon of no trigger

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When the mainboard is powered on, the current is not displayed

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When we trigger the switch, the current doesn't change at all

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This phenomenon is classified as no trigger

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So, that's it for this lesson