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Hello everyone, in this lesson we will take a look at the power supply of the desktop computer.

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The power supply of the desktop is a device that converts

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220V alternating current into direct current of various voltages required by the computer.

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The quality of the power supply directly affects the stability of the entire computer operation.

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The color of the output wire of the power supply is generally various,

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and different colors represent different meanings

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Let's take a look at what the different colors represent

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First the purple line, which is this line

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It is 5VSB, which is a 5V voltage

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As long as the power supply is plugged in 220V AC, it will output this 5V power supply

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Next, this red wire is also 5V

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These three wires are all red wires

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This 5V is the 5V that will be output after the power supply starts working

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Orange 3V

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Here are the orange lines

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The 3V of the orange line is also output after the power supply is working

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Yellow 12V

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These two wires are yellow wires, and their voltage is 12V

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It is also the power supply that will be output after the power supply works normally.

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Green line PSON

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This green wire is here, it's the power on signal

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When this signal is pulled low, the power supply will work

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If this line is high, the power supply will not work

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Gray Line PG

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The gray line is this one

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The PG signal is sent after the power supply is working normally,

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the purpose is to tell other devices that the power supply is working normally

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Blue wire -12V

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This line is the blue line

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It looks more like the purple thread

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This blue line is generally used less on the motherboard, so we can ignore it

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Finally, the black line

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The black wire is GND, which is the ground wire

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Next, let's take a look at the workflow of the power supply

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The first step is to plug in the 220V power supply

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After plugging in the 220V power supply, it will generate purple 5V

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Then the main board pulls down the green line

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Pulling the green wire low is to tell the power supply that you are going to work

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After the power supply receives a low level green line, it will start working

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After working, all voltages will be output

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When the power supply outputs all the power supply,

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the power supply will output a high-level PG signal with a delay of about 300 milliseconds

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At this point, the power supply is over

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If there is no other device that wants to make the power supply work,

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you can directly short the green wire and the black wire together

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After the green line is shorted together, the green line will be pulled low,

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which means that the power supply will work when it receives the turn-on signal,

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and it will output other power supplies.

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We can use this method to judge whether the power supply can work normally