Question about MSI 770G45 Motherboard

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I have a msi 770-g45 motherboard, my computer suddenly just died. Now it wont power up anymore. The led indicators give a short blink and nothing more happens.

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Usually a direct indication of a bad Power Supply. Weak voltage power rail, (Or more than one)

1) ALL of the LED lights on at once would use less than 1 Watt of power.
2) EACH fan uses 2 to 3 Watts of power.
3) A typical Processor can use 51 to 125 Watts of power. Depends on what Processor it is.

You have enough power to briefly light a few LED lights, and that's it.
Do you have a KNOWN to be good, Compatible power supply available to use for a test unit?
One you could perhaps borrow from a working computer?

Failed power supply, and computer is dirty inside, are the two leading causes of computer failure.
The Power Supply is cooled by air as are the components inside the computer.

The Power Supply uses Heatsinks inside, and an internal fan, for it's cooling components.

Example of the inside of a typical SMPS, (Switched-Mode Power Supply),

The cylindrical blue 'can' shown as B, is an Electrolytic Capacitor, (Radial Aluminum Electrolytic Capacitor)
To the immediate right of the blue capacitor is a Heatsink. Looks like a series of finned squares connected together.
There is another Heatsink to the right of the letter C.

{Basic construction of a Heatsink is a plate of metal with tall, thin fins protruding from it.
The plate of metal absorbs heat from whatever object it is placed against, and the tall, thin fins absorb heat from the plate.

The fins then radiate the heat away.
The fan draws air across the fins of the Heatsink, and the air flow helps to carry heat away}

When the fins of the Heatsink are clogged with dust, dirt, etc., and the Fan blades, center hub, and surrounding cage, {Shroud}, are also clogged, the cooling capacity drops tremendously.
This causes the components inside the Power Supply to overheat.

Heat = Wasted Energy

The Power Supply strains to keep up with the call for power, but due to the overheated condition cannot, and eventually components inside the Power Supply fail.

Opening a Power Supply, and trying to repair it is not a recommended suggestion.
Electrolytic Capacitors can hold a charge for weeks, months, sometimes over a year.
Without using the proper technique to drain the residual power from the capacitor/s, the charge can be released to YOU.
The shock can be Bad to Fatal ]

Best suggestion is to just replace the Power Supply.
For additional questions please post in a Comment.


Posted on Apr 03, 2011


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