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Hello everyone, in this lesson we will talk about the distribution of power supply on the mainboard

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The location of the mainboard power supply is generally relatively fixed

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Familiar with the location of the power supply of the mainboard,

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the efficiency will be higher during maintenance

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Generally, we divide the mainboard into 3 areas, as shown on the right

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They are called standby area, memory power supply area and CPU power supply area

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The standby area, as the name implies, is the power supply area during standby.

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The memory power supply area is for the memory,

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and other power supplies are generally in the CPU power supply area.

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Here is the power supply for each zone

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Let's look at it from top to bottom

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First is the waiting area

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The standby area is mainly 3V standby and 1V standby

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3V standby is generally generated by a voltage regulator,

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while 1V standby is generally generated by a PWM circuit

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The inductor for 1V standby is generally around the bridge

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So we just need to find an inductor around the bridge, then we find the 1V standby

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Further down, the memory area

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The power supply of the memory area has VDDQ, VTT and VPP

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In general, the largest inductance in the memory area is VDDQ

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VDDQ is a PWM circuit

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The next one that is easier to find is VPP power supply

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VPP power supply is generally in the lower half of the memory slot

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Moreover, the VPP power supply generally uses a PWM circuit.

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So we only need to find the inductor in the lower half of the memory slot to find the VPP power supply

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Let's look at VTT power supply

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It is generally closer to the fool-proof opening in the middle

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It is generally powered by LDO

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Finally, look at the CPU power supply area

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Let's look at the large inductance first

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The rightmost of these large inductors above the CPU is VCCGT, which is the integrated display power supply.

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The rest of these are generally the VCORE of the CPU, that is, the core power supply.

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The next one that is easier to find is VCCSA

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The VCCSA of most mainboards is below the VCORE

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Here is also a PWM circuit with a large inductance

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But this mainboard is different

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Its VCCSA is here, it is an op amp plus MOS circuit, and the rest is VCCIO and VCCST

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If there is no drawing, it may not be very easy to distinguish which is which.

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Let's look at two different boards

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First is the standby area

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The standby area is mainly 3V standby and 1V standby

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1V standby is an inductor near the bridge

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This is the inductance near the bridge

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3V standby is an eight-pin voltage regulator tube, you must look at the model of the chip to know

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With the memory slot as the boundary, the right side is the memory power supply area

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The memory power supply area has VDDQ VTT and VPP

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The largest inductance is VDDQ, and the small inductance in the lower part is VPP

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VTT is generally closer to the fool-proof port in the middle

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Then this chip may be the power supply chip of VTT

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Look at the CPU power supply area

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Among the inductors above the CPU, the rightmost one is the VCCGT power supply, .

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which is the integrated display power supply

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In addition to the integrated display power supply, the rest are the core power supply of the CPU

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And VCCSA is the lower left corner of the CPU, next to the core power supply inductor

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Next is VCCST and VCCIO

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If there is no drawing, it is really difficult to distinguish which one is which.

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Look at the one on the right

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Look at the standby first

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With the PCIE slot as the boundary, the best thing to find below is an inductor that is closer to the bridge.

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It is 1V standby

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At the same time, this mainboard also has two eight-pin chips, which are used to generate 3V standby

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Let's look at the memory area

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The best power supply for the memory area is the memory main power supply

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The memory main power supply is a relatively large inductor

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The VPP power supply is generally a PWM circuit

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It is generally in the lower part of the foolproof port

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This part has only one inductor

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Then this inductor is the inductor powered by VPP

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Finally VTT power supply

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VTT power supply is generally near the fool-proof port

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There is no suspected chip near the fool-proof port of this mainboard.

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Then this VTT is not so easy to find.

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Finally, the CPU power supply area

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The best thing to look for in the CPU power supply area is these large inductors

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The two above are VCCGT

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Next to these three are VCORE

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And the large inductor closest to VCORE in the lower left corner of the CPU is VCCSA

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The following two are VCCIO and VCCSTPLL.

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It is really not easy to distinguish without drawings.

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Ok, the above is the power supply distribution of the 100 series mainboards

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Their distribution is basically the same