Question about Intel D865GBF Motherboard

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Motherboard failure Motherboard Intel D864 GBF - when Power button is pressed ON it gets ON, fans rotate, but within 1 - 2 min it shuts off. Can you please help.

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  • neelesh Jan 06, 2008

    Thanks for your help. The problem has been solved and was due to the Power Supply. When the output voltage from the SMPS were incorrect. Post replacement of the SMPS, the problem has been solved.



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Posted on Jan 05, 2008


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Show all solution to d945plrn motherboard problem not powering up

PSU IS OK? You're sure? You tested the 3 main voltages coming out?

DON'T rely on; "The LED lights are on, and the fans spin, so therefore the PSU must be good.

1) If ALL the LED lights 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 uses 51 to 125 Watts of power.

With a Power Supply that has a weak voltage power rail, you will see LED's light, and fans spin; BUT not enough power to turn the Processor on.

Power Supply also needs to be plugged into motherboard to test, because you need a Load on the Power Supply.

PSU is KNOWN to be good? I mean KNOWN.
Not, "It's brand new so I know it has to be good"
Okay, moving on.

How did you test it? Install on another working motherboard?

Are the Electrolytic Capacitors on the motherboard good?

Capacitors on the motherboard are used as Filters, and Voltage Regulators.
The ones used as Voltage Regulators are in the Motherboard Voltage Regulator Circuit,

Part of what the Motherboard Voltage Regulator Circuit does, is to regulate voltage for the Processor. (CPU)

The CPU MUST have a steady, 'clean', supply of voltage, and it MUST be kept within the Processor's voltage tolerance range.
Too much, or too little, and the CPU shuts off. BIOS turns it off.

(CPU stands for Central Processing Unit. Another term used is Microprocessor, or simply Processor for short.
I know you are aware, just posting for all those who read the solution in the future)

[Better motherboard due to the Intel Q965 motherboard chipset,

Scroll down to Q965 in left column ]

For additional questions please post in a Comment.


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I faced and solved at least 6 - 7 such problems on different nx5000 laptops

If CAPS LOCK is not responding then its your motherboard.

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K8mc51g motherboard wont turn on i shut it down and now it wont power on i tried reset jumpers and removing the battery for 30 sec and taking away all power for 24 hours

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