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In this lesson,

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we continue to talk about the circuits related to the trigger small currents

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What circuits are related to the trigger small currents?

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In actual maintenance, we generally refer to this as standby

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It can also be seen as crystal oscillator, main power supply and battery

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As soon as we put on the battery,

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the main power supply will be generated, which we usually call standby

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Including the voltage of the power supply to the power-on signal line,

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this circuit is also a standby

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Then another circuit is from the power button to the inside of the trigger power supply,

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which we usually call the trigger circuit

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We are going to press the power button,

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this action is called trigger

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We press the power button,

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ground the power button

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The power button signal can be grounded for more than 5 seconds,

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to trigger the power supply to output power first

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That is, the power is triggered and it will work

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What does it prove?

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It proves that these two parts of the circuit are no problem,

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we don't consider them

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When we study trigger small current,

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we don't consider the circuits in the red frame, blue fram and green frame

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Let's see who relates to the trigger small current

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Trigger small current fault is related to the power supply chip,

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whether the power supply chip is installed normally,

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and whether the power output from it is lost in a certain way

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Whether there is a problem with the clock signals, reset signals,

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And whether there is a problem with the CPU itself,

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whether there is a problem with the temporary storage

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Whether there is a problem with the soldering of the temporary storage and CPU,

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the soldering of the CPU to the hard disk

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Whether the hard disk itself is damaged,

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whether there is any problem with the boot program in the hard disk

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And whether there is a problem with the data communication between the hard disk and the CPU

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These are the direct circuits involved in trigger small current faults

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Ok, that's it for this lesson