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Today we will learn how to connect the ATX power supply to the mainboard and how to measure its voltage

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The power supply is AC, 220V power input terminal

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Here is a 220V power socket, which can be used to plug in monitors, etc.

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All of these interfaces are power supply output interfaces

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Among them, the 24PIN plug and the 4PIN plug are directly inserted on the mainboard.

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These are the ones that provide power to the hard drive or optical drive

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There is a separate 6PIN interface here, which is for powering the discrete graphics card

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Next, we first plug this power supply into the mainboard

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There is a buckle here, it must be in place

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Next, we plug this 4PIN interface into the end of the CPU power supply

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This is for the CPU power supply

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After all these are plugged in, the next step,

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we can plug in the AC 220V power supply

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At this time, the power supply has already output the standby voltage to the mainboard.

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We have introduced in the previous course that the purple line (5VSB) of this power supply is the standby voltage

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The green line is the power-on signal

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In standby state, it is also a high level

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Let's measure it with a multimeter

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The multimeter is set to the DC voltage position, the black marker is grounded,

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and the red marker is used to measure the purple 5VSB

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This is the measured voltage

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Next, take a look at the green power-on signal

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The green power-on signal is currently 3.4V, which is also a high level

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Currently in standby mode, other lines are not powered,

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it only has a purple 5V standby voltage and a green power-on signal

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Ok, here's the power supply connection to the mainboard and the standby voltage measurement