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Test points in motherboard

Dear Sandrew,

my motherboard is having nodisplay problem, please tell me which are signals and voltages i have to check

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Comes on, nodisplay, resets after @30seconds

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Dont show video but it turn on perfectly

Usually indicates a bad Power Supply.

LED lights light, fans spin, but NO Signal on monitor.

No Video Signal, because the computer isn't sending one out.
Because the computer isn't working.

Know this;

1) If ALL the LED's were on at once, they would use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts of power.

3) A typical processor can use from 51 to 125 Watts of power.
Just depends on what Processor it is.

A Power Supply with a weak voltage power rail, will not have enough power to turn the Processor on.

However not to jump the diagnostic flow chart; check the monitor cable FIRST.
Use on another known to be working computer. If it checks out OK, the problem is the computer, and I think -> Power Supply.

Test the 3 main voltages on the Power Supply, with a multimeter set to DC Voltage; OR use a KNOWN to be good, Compatible power supply, for a test unit.

For additional questions please post in a Comment.

Dec 29, 2012 | Motherboards

2 Answers

Pls help my computer shows no display

CPU fan runs, harddrive picks up, but no display.

1) Bad Power Supply
2) Bad graphics chipset.

The two main factors for desktop computer failure, is a bad power supply, and/or the computer is dirty inside.

A) Bad Power Supply

Weak voltage power rail
Enough power to light LED lights, and perhaps spin fans, but not enough power to turn the Processor on.

IF all of the LED lights were on at once, they would use less than 1 Watt of power.

EACH fan uses 2 to 3 Watts

A typical Processor can use from 51 to 125 Watts.
Just depends on what Processor it is, as to what the maximum Wattage usage is.

CPU fan runs? Sure. It's only using 2 to 3 Watts.

Harddrive 'picks up'? You will hear the Spindle Motor spinning the Platters inside. Means nothing.

With no Processor running, BIOS can not hand the computer over to the Operating System. (WinXP is one example of an O/S)

There is nothing to find the Boot Record, on one of those Platters inside the harddrive.

(Explanation of physical construction of an average Harddrive, )

You can check the Power Supply voltages out. See if there is a weak voltage power rail.

Power coming into the Power Supply is the dangerous voltage.
Power coming out of the Power Supply is not.

The Power Supply in your Personal Computer is an SMPS.
Switched-Mode Power Supply,

Your Power Supply converts the electricity from your home, or business, into three main voltages,

A) 3.3 Volts
B) 5 Volts
C) 12 Volts

All are DC voltage. (The incoming electricity from your home or business, is AC voltage)
{In comparison two D cell flashlight batteries produce 3 Volts DC}

Use a multimeter to test the voltages. If you do not have access to one, an economical multimeter can be purchased for around $8 to $12. A multitude of stores carry them. An auto parts store is but one example.
Analog or digital, it doesn't matter. (I prefer Analog)

Set the Function Knob to DC voltage. (If just a symbol is used it is a dotted line over a solid line)

If there is more than one setting for DC Voltage, set it to the 0 to 50 Volts scale. (0-50)

The red probe lead is the Positive lead.
The black probe lead is the Negative lead.

The Positive probe lead touches the power wire
The Negative probe lead touches a Ground wire.

The 3.3 Volt power rail, the 5 Volt power rail, and the 12 Volt power rail, are the power wires.
Test one at a time.

ALL Black wires are GROUND wires.

Test at the ATX main power cable's connector.
The ATX main power cable is plugged into the motherboard. The Power Supply is plugged into power.

The ATX main power cable used for a Gigabyte GA-K8VM800M motherboard,
is a 20-pin ATX main power cable. This is an example of a 20-pin ATX main power cable,

Note the photo to the far right. The ATX main power cable is plugged into the motherboard.
Testing the voltages is done at the Back of the connector. Back of the ATX main power cable connector. The Back of the connector is where the wires go in.

The probe leads tips, will not fit down into the socket holes, next to the wires already present.
Suggest use an adapter. Suggested adapter is a paper clip.

The paper clip is straightened out, then inserted down into the socket hole, RIGHT NEXT TO THE WIRE that is already there.
The paper clip Must go down into the socket hole, to touch a metal terminal.

At the end of every wire going into the ATX main power cable connector, is a metal terminal. You have to go down past the insulation of the wire, and touch the metal terminal with the paper clip.

A) The Orange insulated wires are 3.3 Volts
B) The Red wires are 5 Volts
C) The Yellow wires are 12 Volts.

Example to test a 3.3 Volt power rail;

Power Supply unplugged from power insert a straightened out paper clip into a socket hole with an Orange wire. Leave it sticking up.

Now insert a straightened out paper clip, into ANY socket hole with a Black wire. (Ground)

Plug the Power Supply into power. Touch the red Positive probe lead of the multimeter, to the paper clip for the Orange wire. Hold it there.
Now touch the black Negative probe lead to the paper clip for the Ground wire.
(Black wire)

You should read VERY close to 3.3 Volts.

Same procedure for the 5 Volt power rail, and the 12 Volt power rail.

{Power Rail;
All 3.3 Volt (Orange wires), end at one central point in the Power Supply.
This central point is the 3.3 Volt power rail.
Same for the 5 Volt, and 12 Volt wires.

You can test any wire of that voltage, and be testing the entire power rail, for that voltage }

Power Supply checks out?
Graphics chipset.

Chp and Chipset are slang terms for I.C.
Integrated Circuit,

The graphics chipset is a GPU.
Graphics Processing Unit,

A GPU can be soldered directly to the motherboard, or to a removable card.

Soldered directly to the motherboard is Integrated Graphics.
Also known as OnBoard graphics. (ON the motherBOARD)

Soldered to a removable card is a Graphics Card.
(Full name is Graphics Adapter Card)

If you are using Integrated Graphics, try using a graphics card.
If the graphics card works, the problem is bad Integrated Graphics on the motherboard.
The graphics card bypasses using Integrated Graphics.

{The above is that you are seeing No Signal on the monitor.
If not check the monitor, AND the monitor cable to see if they are good. Test on a known to be good, working computer }

For additional questions please post in a Comment.


Nov 05, 2011 | Gigabyte GA-K8VM800M Motherboard

1 Answer

AV8 Motherboad post code C5 freezes on boot.


Try cleaning the contact point of the memory modules "with a pencil eraser" and insert them back... Clean also the Processor heat sink if dusty... Then check the voltage of the CMOS (3V) battery it maybe dead, if so you need to replace that with the same type.
Keep me posted if still does not work...

Happy fixya...

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Intel d845 gvfn display problem.

sir i have a problemmy mother board intell d845 epi/d845gvsr my mother board is cannot desplayed or display is not come but if i remove rame the mother board is give error beaps if i attach ram board is not displayed

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Dear Flyman1957,
You can download the drivers from this URL :

Cheerup and enjoy

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I have not identified the specific components on the motherboard that blow, but I can tell you the defect in the Bestec supply. The +5 VSB, which is the voltage that is on at all times, loses regulation and climbs to 8-11 volts. I believe this "higher than the required" +5V takes out the components on the motherboard involved with the computer/power supply "turn-on" circuitry. The "on" button on the eMachines front panel no longer turns the motherboard on because the "kept alive when the main power is off circuits" - which allow the on/off button to do its job of turning on the machine - no longer work.
Test your Bestec power supply by plugging it in the wall socket and have it not connected to anything. Read the voltage between the purple wire and any black wire. If you see +5.0V, then this wasn't your problem. If, like it did on mine, is closer to between 8, and 11 V, this is what took out the motherboard.

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