Question about Compaq ( 277498-001) Motherboard

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I don't have the manual for 277498-011

I need the pdf diagram for jumper sitting ( power switch - restart - etc . . ) .
the power supply does not work and I have to replace it.
do I have to put the original one or I can put any power suplly have the same socket
thank you

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  • KevinEBrown May 11, 2010

    What Motherboard do you have?

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As for the Power Supply 99% sure it is an ATX which as long as you get the same Watt as the existing you will be okay. Make sure you look at your existing connectors to see if you have a 24 pin or 20pin motherboard and 4 pin or 8 pin additional power plug (black and yellow wires) and the new power supply has matching connectors....older ATX supplies have only 20 pins, but there are converters from 20 to 24 pin available.

Watch for the new power supplies and your drive connectors as some of the new power supplies have limited ATA plugs...if you have a lot of ATA devices you might need SATA power convertor plugs or ATA splitters to get all you ATA devices up.

Posted on Sep 11, 2009

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I need compaq motherboard 277498-001 connection diagram of jumper setting and power switch..etc

Posted on Jan 02, 2010

  • raju_kochu Jan 02, 2010

    i need hp compaq 281946 user guide

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1) Power Supply to Motherboard
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To start the Power Supply, jump the two contact pins in the Front Panel header on the motherboard, with a small flat tipped screwdriver. (Jewelers screwdriver is the best for this)

(The front of your computer is the Front Panel.

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http://ep.yimg.com/ca/I/yhst-27518546784426_2237_361300875

http://www.tragant.de/pdf/32992-4f05de2de5d79.pdf

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The contact period is NO more than 2 seconds.

http://www.viaembedded.com/en/products/boards/1510/1/EPIA-M860.html

Bottom -> Users Manual UM_EPIA-M860_113.pdf

After you click on the above, a small window will come up on the right.
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If not, click in the empty circle to the left of Open with.

[Should state Adobe Reader (default) in the box to right of Open with]

The Front Panel header is on Page 31 (Adobe Reader page number box at Top)

Two rows of contact pins.
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BOTTOM row is numbered ODD.

Top row from Left to Right, is Pins 2, 4, 6, 8, 10, 12, 14, and 16.
Bottom row from Left to Right; is Pins 1, 3, 5, 7, 9, 11, 13, and 15.

Pins 6 and 8 are for the Power On switch.

{ Pins 2 and 4 are for the HarDDrive activity LED light.
Pins 10 and 12 are for a Reset switch, IF a Reset switch is used.
Pins 14 and 16 are N/C. Not Connected.
Pins 1 and 3 are for a Dual color Power On LED light.
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Use pins 5 and 7 for a two wire Single color Power On LED light.
Pins 9 and 11 are N/C.
Pins 13 and 15 are for an internal speaker. The small speaker/buzzer for hearing BIOS Beep Codes ]

The main power cable is a 20-pin ATX main power cable.
General example of a 20-pin ATX main power cable, and it's respective connector on the motherboard,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

You want the main power cable plugged into the motherboard, as shown in the photo to the Right.
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Power Supply comes on you have a bad Power On switch.
Power Supply does NOT come on; you have a bad Power Supply.

The Soft Power On circuit is 5 Volts DC.
In comparison two D cell flashlight batteries produce 3 Volts DC.
However, not stating that there may be a small spark, as you connect the U-shaped jumper wire.
For this reason you may wish to use a glove, on the jumper wire hand.

Cross-compile connections? I am at a loss.
Explain further in a Comment.

Regards,
joecoolvette

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uzowuanya
e-mail:uzowuanya@yahoo.ca

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