Question about Intel Motherboard

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Your solution re motherboard

Could you please explain what this part of your solution means - "vrm circuit mosfet sort " ?

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  • udinho May 11, 2010

    thats righto!!! salute to hvpatel



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"voltage regulator module" thats have next to core voltage connector it's supply to cpu
cpu need 2 volt 45 amp and our power supply can produce voltage 12 volt 3 amp so motherboard can produce more amp for cpu . 6 mosfet using for this process it's near by cpu

Posted on Apr 14, 2008


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How do i replace the voltage regulator on an hpg62 laptop motherboard?

That took a second................

It is an intelligent question, in that the way it was posted.
Way it was deduced, also.

At least I'm guessing this has something to do with your DC to DC Circuit, and not a reference to the Motherboard Voltage Regulator Circuit.

Allow me to explain;

1) The motherboard voltage regulator circuit, regulates voltage for ALL of the hardware components; and electronic components on the motherboard.

The above link shows direct information for desktop computers, but a lot of it can be transferred over to a laptop motherboard.

You may be familiar with older motherboards, that used a VRM.
Voltage Regulator Module. A replaceable component.
The VRM was used to regulate voltage for the Processor. (CPU)

Later designs, just have the VRM incorporated into the motherboard design.

My thinking is that you are referencing to the DC to DC Circuit.
The circuit that is responsible for charging the Battery when needed, or just having the laptop use voltage straight from the AC adapter. (Charger)

What usually goes out in this circuit is Power MOSFET's.
Occasionally MLCC's too. (That are also SMD/SMT)
Can also be an SMD fuse.

Before I go further, do I assume you have checked the AC adapter (Charger), for 19 Volts DC?

[Center pin of plug TO laptop is the Positive connection.
Cylindrical metal shell on the inside of the plug, is the Negative connection)

The AC adapter plugs into the DC Power Jack on the laptop. (DC_IN)
With the HP G62 model series, the DC Power Jack is attached to wires in a cable; and these wires end in a wide, thin plug connector.

The DC Power Jack itself resides in a Channel, formed in the outside edge of the Base Enclosure. (Bottom Cover)
The plug connector at the end of the harness, plugs into the motherboard.

Although this is a DC circuit, which only requires a Positive, and a Negative; there is more than one Positive wire, that leads to the plug connector.

More than one Negative wire too.
So in testing with your multimeter, observe to which socket holes in the plug connector; get Positive, or Negative wires.

Multimeter set to OHM's (1K), it is not the exact resistance you are looking for, it is JUST that you get a reading.
No reading indicates burnt/broken wire.
(This baby isn't going to have any stretched/broken wires)

Here they show separate examples of the plug connector, and DC Power Jack, also ]

Moving on..............

Let's take a look at a DC - DC circuit on the HP Pavilion dv6000, and Pavilion dv9000 series of Notebook PC's; as an example,

Here we see the;
1) Fairchild Semiconductor Industries - FDS6679 - Power MOSFET, and the,
2) Alpha & Omega LTD - AO4407 - Power MOSFET, is being used.

Posting for further identification, availability, and cost;


Here we see it is obsolete.
Using the cross-reference match example FDS6679AZ,


[Note the J-leads on the sides. There are 4 on each side ]


Obsolete also. Let's use the first, cross-reference match example given,

78 Cents USD

An MLCC is a Multi-Layer Ceramic Capacitor.
The ones used on your motherboard, are SMD/SMT; just like the Power MOSFET's are.

Surface Mount Device/Surface Mount Technology

Showing a 4.7uF (Microfarad) example, at 16 Volts (DC),

Looking back at the Mayohardware link, observe the second photo down; with the AO4407 circled in Yellow.

Look to the immediate right of the AO4407. There is an MLCC.
(That is SMD/SMT)
There is one above it. One above that one at the Top. One to the right, and one to the right of it. (Placed vertically)

Appears to be immediately below the AO4407, plus there are 4 smaller examples at the Bottom/Left, of the AO4407.

If you see any that are burned/blackened, replace.

A basic example of an HP G62 motherboard.

I state basic, because the one in your laptop, may have a design change; or may not have the design change this one does.
When replacing USE the SAME HP part number that is on your motherboard.

(Stating HP G62 is just stating the Model Series.
Kind of like stating Chevrolet, and truck, but not the model)

The page automatically opens with the Main view, showing a Bottom view of the motherboard. This is where the Processor, graphics chipset, and Ram Memory are.

Looking at the three small views underneath, the 1st view; or view to the Left, is the Bottom view.
Middle view is a view of the Top of the motherboard.
Right view is a view of the Left side of the motherboard.

(You can just SET your mouse in the middle of the main view, and the Zoom In feature will operate.
Now just move your mouse around.

If you CLICK on one of the SMALL views, it will stay in the Main view)

In the Bottom view, look all the way to the Left.
Motherboard turns into a 'peninsula', or just a rectangular strip.
At the end you see the wide Brown connector. This is where the DC Power Harness plugs in.

Pay attention to that round 2R5F.
That is a CSM54N-2R5F. Just wasn't room to put all that cr@p on it.
It is a Fuse. It is SMD.

Those 3 little round 'can's, are Solid Polymer Capacitors. They are Leaded, and of the Radial style. Both leads come out of the same end. If one of these babies are bad, you'll know it. They EXPLODE.
No. They hardly ever go out.

Next to the 2R5F fuse, are Power MOSFET's. Check their condition.

Now go to the Top view. Go to the Right side.
Here you see the opposite side, of that 'Peninsula' of the motherboard.

Make sure there are no burned components on this side.

Was this what you were looking for schmeichel_2?

For additional questions please post in a Comment.

Apr 02, 2013 | HEWLETT-PACKARD HP G62 Notebook

1 Answer

No power vrm supporting mosfet

I gave a solution already, but do not see it listed in my user account. Forgive me if I post this twice;

A Voltage Regulator Module isn't used on an MSI G31M3-L V2 motherboard. No separate module.
It is now incorporated into the Motherboard Voltage Regulator Circuit, for the motherboard.

(Unless your problem doesn't deal with an MSI G31M3-L V2 mobo, AND you are referring to an older motherboard, or server motherboard that Does)

You need to follow the circuit traces (Signal Traces) on the motherboard, and see where they lead from the Power MOSFET Source pins.
See which electronic component has failed in the circuit.

You know Electrolytic Capacitors (Radial Aluminum Electrolytic Capacitors), are used in the motherboard voltage regulator circuit.
They ARE the weakest link.

Think what happens if some are used in a Series circuit, and one of them goes bad?
Just like the old Christmas tree lights.




Nov 13, 2012 | MSI G31M3-L V2 Motherboard

1 Answer

Dell precision 470 work station processor fans over speed

Dell Support > Precision 470 Workstation Desktop PC > Users Guide,

Tools to Help Solve Problems > Diagnostic Lights,

"A possible VRM 0 has occurred"

VRM = Voltage Regulator Module

Here is what the motherboard looks like,

[Note* Posted for photo reference only. Not for advertising.
Besides, I do not see any VRM's plugged in. Means you get the motherboard only, and no VRM's. You need a VRM ]

What the Voltage Regulator Module looks like,

(Again, not for advertising. Click on the photo of the VRM to enlarge)

Notice that your motherboard has two VRM's. This is because there are two Processors.
Apparently the VRM for one of your Xeon processors is bad. (Z-on)

Since it states VRM -> 0, it is for the Processor 0, or in the number 1 processor socket.

What does a Voltage Regulator Module do for a Processor?
Regulates voltage.

A Processor MUST have a steady, 'clean' supply of voltage, AND it must be within the voltage range for the processor.

Since the motherboard uses an Intel E7525 motherboard chipset, it can support Intel Xeon processors, with up to an 800MegaHertz Front Side Bus. (800MHz FSB)

Looking at a typical Intel Xeon single-core processor, with an 800MHz FSB, let me show you it's voltage requirements,

1.287 to 1.400 (DC)

May be just a bad VRM.

However, I would also like you to look at the Electrolytic Capacitors on the motherboard. From what I have seen, those motherboards are notorious about having capacitors go bad.

Visual identification of bad Electrolytic Capacitors,

For additional questions please post in a Comment.


Jul 09, 2012 | Dell Computers & Internet

1 Answer

Diagram of vrm section

Intel D845GVSR,

Doesn't have a Voltage Regulator Module.

It has a motherboard voltage regulator circuit. It is integrated into the motherboard, not a separate module.

You will have to find the components, in the motherboard voltage regulator circuit, yourself.


Radial Aluminum Electrolytic Capacitor

Starts at 0:04

Electrolytic Capacitors are the weakest link in the motherboard voltage regulator circuit.

Part of what the motherboard voltage regulator circuit does, is to regulate voltage for the Processor.
Just like a VRM does.

A Processor has to have a steady, 'clean', supply of voltage, and it MUST be within a VERY small tolerance range.
Cannot be too much, or too little.

For additional questions please post in a Comment.

Jun 28, 2012 | Intel D845GVSR Motherboard

1 Answer

Processor not heating

Check 12 Volt Motherboard VRM Section, Next Checek VRM Upper Mosfet or lower Mosfet one of them may b short.

Mar 08, 2012 | ASUS P4P800-MX Motherboard

1 Answer

Fan move but, no display, every mosfet of vrm section are ok,input coil give 12vlt but output coil does'nt give any volt

Not sure what you mean exactly, but try changing the PSU if there is not voltage from the power rails

Dec 29, 2010 | MSI K9MM-V Motherboard

7 Answers

Intel motherboard 845gvs

intel 845 gvsr motherboard have two most problem

vrm circuit fail IC ADP3168 {between the cpu and core volt connector}
f7338 mosfet ic fail {between the memory slot and ide connector}

Feb 26, 2008 | Intel Motherboard

1 Answer

Ga-7N400E powerup problem

VRM Circuit problem found there
disconnect only core voltage connetor and power on motherboard
if motherboard on so confirm that your vrm circuit is sort

replace vrm circuit mosfet

Feb 23, 2008 | Gigabyte GA-7N400E-L Motherboard

1 Answer


Check your power supply - it could be providing too much current. There could also be a faulty VRM on the board, but there is nothing you can do about that.

A little thermal epoxy and ramsinks (video card ram modules sized heatsinks) might help.

Dec 05, 2007 | Gigabyte GA-8I945P-G Motherboard

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