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VRM fault no display

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  • subratamajhi
    subratamajhi Oct 20, 2012

    motherboard c.p.u fan not on but s.m.p.s on?

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  • 2,229 Answers

This is a voltage regulation module fault. Most likely traceable to a motherboard circuit. Suggest first clearing the CMOS (a jumper setting near the battery) and also removing and replacing the battery. If this is not a CMOS problem, then you are looking at replacing the motherboard.

Posted on Feb 23, 2012

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1 Answer

Dell precision 470 work station processor fans over speed


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

http://support.dell.com/support/edocs/systems/ws470/en/ug_en/index.htm

Tools to Help Solve Problems > Diagnostic Lights,

http://support.dell.com/support/edocs/systems/ws470/en/ug_en/advtrbl.htm#wp1057482

"A possible VRM 0 has occurred"

VRM = Voltage Regulator Module

Here is what the motherboard looks like,

http://www.ebay.com/itm/DELL-PRECISION-Workstation-470-XC838-Motherboard-with-2GB-/140795014004?pt=Motherboards&hash=item20c8096b74

[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,

http://www.thebestpartinc.com/kg229.html

(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,

http://www.capacitorlab.com/visible-failures/index.htm

For additional questions please post in a Comment.

Regards,
joecoolvette

Jul 09, 2012 | Dell Computers & Internet

1 Answer

Diagram of vrm section


Intel D845GVSR,

http://www.ebay.com/itm/Intel-D845GVSR-Socket-478-Motherboard-Gateway-E-2100-/380449645479?pt=Motherboards&hash=item589490e3a7

http://www.intel.com/p/en_US/support/highlights/dsktpboards/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.

How?

http://www.hardwaresecrets.com/article/616

http://www.capacitorlab.com/visible-failures/index.htm

http://www.hardwaresecrets.com/article/How-to-Identify-Japanese-Electrolytic-Capacitors/595

http://www.mouser.com/Passive-Components/Capacitors/Aluminum-Electrolytic-Capacitors/Aluminum-Electrolytic-Capacitors-Leaded/_/N-75hqw/

Radial Aluminum Electrolytic Capacitor

http://www.youtube.com/watch?v=KN6_-8fYHo0

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.
Regards,
joecoolvette

Jun 28, 2012 | Intel D845GVSR Motherboard

1 Answer

Startup problem


Assuming all appears normal (LED's etc) I would suggest you could have a Processor or VRM issue. Drop the machine to a single processor /VRM and see if that helps. Another possibility is a system board issue

May 27, 2009 | HP ProLiant ML370 G4 Server

1 Answer

No display on DL380 g4


This can be caused by a processor / VRM issue or even a system board fail. Try dropping to a single proc and VRM and swap test with the others.

May 01, 2009 | HP Compaq ProLiant DL380 G4 Server

3 Answers

Its not booting and the Leds VRM and NMI are with amber color


VRM and NMI lights lit usually indicate an issue with CPU #2's VRM which can be replaced. Also check 5 lights on back middle of system. If VRM light is lit here remove CPU 2 and VRM and reboot system. If system boots, this was the issue...

Apr 25, 2009 | IBM eServer xSeries 346 8840 (884022U)

1 Answer

Adding second CPU


Hi

Did you receive a VRM with the the PRC upgrade kit? And have you installed it?

The following items are/should be included in a microprocessor upgrade kit:
• A microprocessor (PRC)
• A heat sink
• Heat-sink retention clip(s)
• A voltage regulator module (VRM),
Your upgrade kit may also include a cooling fan.

If you are adding a secondary microprocessor, examine the VRM to ensure that it is the correct VRM for your system. Install the VRM in the appropriate secondary VRM connector, ensuring that the latches at each end of the connector engage. If you received two VRMs with the upgrade kit, replace the primary VRM already installed in the system with one of the VRMs from the upgrade kit.
Note: The system does not support mismatched VRMs.

Check PE1600sc Microprocessor Upgrade Installation Guide - http://support.dell.com/support/edocs/systems/pe1600sc/multlang/proc/9D904A05.pdf

Let me know how you get on

Mike

May 13, 2008 | Dell PowerEdge 1600SC Server

5 Answers

Possible VRM 0 failure


69bf9f3.jpghi dear
Short for voltage regulator module, a small module that installs on a motherboard to regulate the voltage fed to the microprocessor. Nearly all motherboards have either a built-in voltage regulator or a VRM, the only difference being that the VRM is replaceable.
the cost is about $80 USD

oke


cropp

Mar 23, 2008 | Dell Precision Workstation 670 PC Desktop

1 Answer

The vrm for my 3500m20


i am using a compaq vrm for my 3500 m20:
the number is:
320266-01
spare:329267-001

this one works!!

Sep 14, 2007 | IBM Netfinity 3500 M20 8657 Server

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