Question about MSI 865PE Neo2-V Motherboard

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Power supply or motherboard?

I accidently switched the power on and off and crashed the computer. Now as soon as power is applied, front light comes on, fans come on and I think hard disc spins. (the front ps on button has no effect) . the screen is blank.First thought power supply - but voltages at 20 way connector appear to be ok except for pin 14 (PS_ON).
-12V appears to be slightly down - say 11.8v.
I have tried removing the graphics card in case it was holding down the PS_ON signal and also tried changing the CPU.
As the voltages seem to be present could the fault still be the Power Supply? Can I prove it before buying a new unit?

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  • Eric Lanning May 11, 2010

    Do you hear a beep when starting the computer? If you hear a single beep, it would indicated that the system is passing POST, if not, I would say your motherboard is dead.

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Your motherboard BIOS is corrupted you need to replace it...

Posted on Mar 11, 2009

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Msi ms-7640 flash codes?


Run the software diagnostic coming with the computer or download from your manufacture supplier for fix it. or get support from them via ONLINE chat website.
God bless you

Jul 20, 2013 | Motherboards

1 Answer

Motherboard


The front of your computer is the Front Panel

The area of contact pins on the motherboard, that the Main wires from the Front Panel go to; is the Front Panel header.

What you are asking for is a Front Panel header pinout.

I do not have the exact Front Panel header pinout, for your motherboard.
Tell you what I do have though..........

Looking at the Front Panel header on the Ebay link, for the Winfast 760m02-GX-6LRS; the Front Panel header looks to be below the CMOS battery, and close to the Bottom edge of the motherboard.

(Motherboard installed in computer case)

Black rectangular strip of plastic, with contact pins sticking up.
Also looks to be a GENERAL set-up for all Winfast motherboards.
(COULD be wrong here)

This is what I am referencing off of,

http://www.devhardware.com/c/a/Motherboards/Foxconn-Winfast-NF4SK8AA8EKRS-Motherboard-Review/3/

Go to the third photo down. Here you see the Front Panel wires, connected to the Front Panel header; on the motherboard.
(Below round CMOS battery)

Note that the contact pin on the Bottom row, and all the way to the Right; is NOT being used.
(I'm using a 26 inch HDTV as my primary monitor, so it may be easier for me to see)

Now look at this Front Panel header pinout, for another Winfast motherboard,

http://www.techsupportforum.com/forums/f15/winfast-mobo-front-panel-connection-558456.html

(Scroll down a little)

PWRLED is for the Power On LED (Light)
PWRSW stands for Power On switch
HD-LED stands for the HarDDrive activity LED (Light)
RESET stands for a Reset switch, IF USED.

Note where it has a Positive ( + ) sign, next to the pin for the PWRLED.
This is the pin the + wire from the Power On LED connects to.
It is the SAME for every LED that connects to the Front Panel header.

Let's number the contact pins, to make the explanation easier;
Starting at the Left side, Top row; going towards the Right;
Pins 2, 4, 6 and 8. There is NO Pin 10.

Starting on the Left side, Bottom row; going towards the Right;
Pins 1, 3, 5, 7, and 9.

Pin 2 is for the Positive wire.
Pin 1 is for the Positive wire
If the LED's are dim, (PWRLED, and HDD LED), OR; the LED's do not light up, switch the wires around.

(Pin 9 is N/C.........Not Connected. This is probably a 5 Volt test point, that was used by the factory)

There is a method you can use though, and find out what the individual contact pins are, in the Front Panel header;

Use an LED with two wires

Computer (Power Supply) plugged into power, go along the top row, and touch two pins at a time, with the two wires of the LED.

Example; Pins 2 and 4, as shown in the pinout.
Did the Power Supply come on?
No?

Go to the next two pins. Try again.
When the Power Supply comes on, you naturally know that is the two contact pins; for the Power On switch.
DO NOT touch them again. In fact connect the Power On switch wires.

Power Supply on, computer running;
Now go back along again;
1) LED light blinks?
You have the HarDDrive activity LED, contact pins.
2) LED light stays on?
You have the Power On LED, contact pins.
3) Computer restarts?
Those are the Reset switch, contact pins.

4) Nothing happens?
May be contact pins for a speaker, or contact pins that are not used.
(Speaker is for hearing BIOS Beep Codes.
You have a Piezo buzzer, to the Left of the CMOS battery; for that)

Post back in a Comment, as to the results.

If possible, I would like to ask upon you; to post the Front Panel header pinout; when you find what it is.

That way when a person in the future also has this same problem; the solution will be posted on the internet, for them to find.

For additional questions please post in a Comment.
Regards,
joecoolvette

Apr 30, 2013 | Leadtek Winfast 760m02-gx-6lrs Socket 754...

1 Answer

Gateway DX4822-01 power switch problems


The front of your computer is the Front Panel.

The area of contact pins on the motherboard, that the Main wires from the Front Panel go to, is the Front Panel header.

Main wires such as Power On LED, Power On switch, HarDDrive activity LED, and Reset switch; IF used.

Suggest KEEP track of where those wires go!

Make a drawing, and notes. I even use a magic marker, (Sharpee?), and make a notation of the Front Panel header pinout, on the floor of the computer case.

In this particular case it isn't known if the Power On switch is the problem, or the Power Supply.

Power On switch;
Power UNPLUGGED to computer, Anti-Static Precautions FOLLOWED; (Don't know? Post back in a Comment),

Remove the twisted pair of W/B and W/G wires, to the Power On switch pins, in the Front Panel header.

Plug power back into computer.
Use a small flat tipped screwdriver, and touch the two Power On switch pins. (Jewelers screwdriver works well for this application)

Power Supply comes on? Bad Power On switch.
Allow Windows to fully load, run for a few minutes; then turn the computer off normally.

Jump the two Power On switch pins again.
Power Supply comes on? You DEFINITELY have a bad Power On switch.

Power Supply does NOT come on?
We will go to a further diagnostic test then.
Awaiting results for first test, then we will go on.

Post back in a Comment.

Regards,
joecoolvette

[Also; is the computer dirty inside? ]

Feb 19, 2013 | Acer Motherboards

1 Answer

The power shuts down as soon as it comes on. Fans start, lights come on, then it turns off.


it may be your power supply : if one voltage aren't good the mother board automaticaly shutdown to prevent damage
or it could be CPU, RAM or motherboard but i think that it's the PSU

Oct 28, 2012 | Intel Motherboard

1 Answer

When I plug my computer up nothing comes on but the green light on the motherboard but when I plug the power supply to the motherboard half way in the processor and the power supply comes on but its like...


This is really poor practice and an excellent way to destroy a motherboard.
You should always have the board connectors plugged in before turning on the power supply, otherwise you may be blowing ICs left and right. It's perfectly OK to plug the supply into the wall or turn on its power switch with the board connectors in place. Also, nearly all modern boards have a set of pins that go to the front panel 'power' switch which does not switch AC but sends a logic signal to the power supply to turn the rest of the voltages on. Those pins have a 5V potential on them that is typically grounded to tell the supply to turn on.
If you're lucky, you still have an undamaged motherboard.

Aug 28, 2011 | ASUS P4P800-VM MB, 865G/ 800FSB/ SATA/...

1 Answer

I would like for someone to tell me what electrically happens when the power-on button on the front of my dell dimension 5100 computer is depressed to power on the machine. Specifically, what...


The ON/OFF button just "closes" an open circuit, e.g., just like a light-switch on the wall.

You could briefly even "short" the two pins on the motherboard front-panel, with a metal screwdriver, to prove that "closing" the circuit is the trigger to the motherboard to react, either by starting-up, or by shutting-down.

Aug 24, 2010 | Intel Motherboard

1 Answer

HP Pavillion 400 Power switch problem???


Could be your power supply is broken. That is a very common problem. Sometimes the computer will keep on restarting when the power supply is about to give way. I doubt it's the motherboard that is causing the problem, but then again i have never had a motherboard fail on me.

May 03, 2009 | HP Motherboards

1 Answer

SUDDEN POWER FAILURE


The light on the motherboard will be on as soon as you plug the power supply in.
If, when you turn on the computer, the fan in the power supply does not start, your power supply is bad. In my experience, the switch in an ATX machine does not go bad--it's just a device to close a contact. If you really want to check it, though, find the place on the motherboard (lower right side as you are looking at the board with the top of the case away from you) where the wires from the front panel are plugged in--the ones that say pwr switch or something like that. When I do this, I remove the wires from the motherboard and short the two prongs where the wires were fastened.
In all probability, though, you need a new power supply.

Feb 05, 2009 | ASUS P5GC-MX/1333 - Motherboard - micro...

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No display on monitor


Check your RAM card and Video adapter .Because problem of one of that thing computer wont on the monitor video.

Jan 10, 2009 | Intel Desktop Board D845EPI Motherboard

1 Answer

My friend computer power lights does not come on


Make sure to check all connections to the computer from the wall/power supply, and make sure if he has a surge protector, that he did not accidently turn it off. If everything is connected ok, check to make sure the switch on the back of the power supply has not been turned off (if the power supply has one).. Also make sure that none of the buttons on the front of the PC are stuck in.

If all is good, the power supply might have failed, in that case, try changing the power supply with a new one.

Sep 05, 2008 | Dell Motherboards

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