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Our class is about maintenance for no trigger failures

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Not trigger is also called no response after pressing the power button

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We talk about it mainly from 4 aspects

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First, the understanding of this phenomenon

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Second, how is the current phenomenon of no trigger

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Third, which circuits are related to no trigger fault,

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or which circuits should we consider when repairing

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Four, how to repair no trigger failure

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What we mean by no trigger here is actually that the mobile phone cannot be turned on normally

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Then let's take a look

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First, let's take a look at the understanding of no trigger

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We use the DC power supply to transfer a voltage of 4.3 volts,

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and use the power cord to supply power to the battery holder of the mainboard

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We press the power button, or we find the power button signal on the power button base,

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and ground it for more than 5 seconds

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At this time,

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we see that the current display of the DC power supply is 0 mA,

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that is, there is no response

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This phenomenon is usually called trigger no response,

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or no current response when pressing the power button,

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and sometimes we call it no trigger

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This is a description of this phenomenon

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What is the essence of no trigger?

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That is, we press the power button,

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it does not respond to the current, we call it no trigger

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When we pull down the power button signal,

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there is a current response, this is called trigger

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Let's look at a display of this current of this phenomenon

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What kind of phenomenon is called no trigger?

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That is, when we get a mobile phone,

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we use the DC power supply to adjust it to more than 4 volts,

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usually 4 to 4.3 volts

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This is the current display position

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Then we use the power cord to buckle the battery holder on the mainboard

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Then press the power button,

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the current position has no response

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If the current doesn't respond, the phone just doesn't work,

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if it doesn't work, it doesn't turn on

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Okay, that's it for this lesson