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In this lesson, let's take a look at the standby 3V generation process of different brands of mainboards

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Here are only the three mainboards that we repair the most

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Gigabyte first

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Gigabyte generally has two voltage regulator tubes, and their appearance is not the same

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The regulator tube on the left is generally used to generate the deep sleep standby voltage

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The voltage regulator tube on the right is generally used to generate the main standby 3V voltage

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ASUS is next

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Most of ASUS is relatively simple,

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that is, the main standby and deep sleep standby voltages are generated

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after the purple 5V passes through a voltage regulator tube.

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The two of them are connected

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The most complex is the MSI

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First, the purple 5V will generate a deep sleep standby voltage through an eight-pin LDO chip

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Then, this deep sleep standby voltage will power PCH and IO

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PCH sends SLP_SUS# to control another LDO circuit or PWM circuit to generate main standby 3V

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The PCIE B10 pin is generally connected to the main standby 3V

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Although the standby 3V workflow of these three companies is listed here,

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it does not mean that the circuit must be like this

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Gigabyte, ASUS, MSI, each of them has many series

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Different series of circuit design may be different

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Here is just to tell you the usual situation