Question about Intel Motherboard

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Ref. Connolly E187242 motherboard. Is there a logic circuit between the point where the power-on switch comes into the front panel connector and where it connects to the green soft power on line on the 24 pin power connector or is this a direct line?

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  • rgh1016 Aug 22, 2010

    It appears there is a logic circuit in this path because by removing the motherboard battery and re-seating it, the startup problem I was having disappeared. See my remarks under Dell Dimension 5100 problems for a more complete description of the problem and the solution.



    I attempted to measure the resistance between the soft start pin on the motherboard side of the 24 pin power connector (with the connector disconnected from the power supply) and ground when the on switch was depressed and the resistance did not change by depressing the switch. This suggests there is a logic circuit on the mother board that controlls the soft start signal (ground) to the power supply.

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If this Motherboard is the same in this link (Dell XPS 400) then i think its the only connection to the Front Panel.
http://www.yo-lid.co.uk/forum/viewtopic.php?f=32&t=87

Posted on Aug 22, 2010

  • Ytee
    Ytee Aug 23, 2010

    sorry from that link you may need to register in forums and thread is in 'Technical' under 'General Technical Issues'

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Dell connolly e187242


Usually old motherboard requires a PS2/older type keyboard to be ready connected when booting.. and I think the hardrive is already faulty.. try replace the hardrive IDE cable..

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Where is the 40 pin IDE on a Connolly cruus e187242 f2


This motherboard only has one such connector. It is above the video connector, right next to the main power connector. When a PC has only one IDE headder, it is usually used for the CD/DVD drive.

This PC is designed to use SATA hard drives for which there are two connectors available for use.

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According to Gateway Support, the Gateway 505GR desktop computer uses an Intel (Ausberg) 915G motherboard,

http://support.gateway.com/s/PC/R/3724/3724iv.shtml

Intel (Ausberg) 915G motherboard,

http://www.ascendtech.us/itemdesc.asp?ic=MB4GWAUGSBURG

Scroll down to the photo with the sections marked in red.

In the top link, looking at the motherboard with the computer case open, the USB and Firewire (1394a) cables, can be seen attached to the motherboard near the letters D, E, and F.

In F that red cable is a SATA cable. One end attaches to the back of the SATA harddrive, (The angled end), and the other end of the SATA cable attaches to one of those SATA headers on the motherboard.
(SATA header = SATA connector on motherboard)

Preferred SATA header for the Harddrive is SATA 1.
DOESN'T matter though. That's the beauty of SATA. You can plug the SATA data cable into ANY SATA header on the motherboard, and BIOS will find the harddrive.


In the second link, looking at the motherboard photo shown, and comparing it to the view of the motherboard as mounted in the computer case, the Front Panel header is at the very Bottom Right.

Two rows of pins in a White rectangular shaped header,

http://www.ascendtech.us/itemdesc.asp?ic=MB4GWAUGSBURG

(S points to Front Panel header)

[ The plastic front of a desktop computer is the Front Panel.
The area of pins on the motherboard, that the Front Panel wires go to, is the Front Panel header ]

A) Top row has Even numbered pins
B) Bottom row has Odd numbered pins.

http://www.intel.com/support/motherboards/desktop/sb/CS-009016.htm

1) Power LED = Power On LED light
2) Hard Drive Activity LED = LED light that flashes (Usually red in color) when your harddrive is active. Being used.
3) Reset switch = Reset Button. The Reset switch is behind the Reset button. (IF the computer uses a Reset switch)
4) Power Switch = Power On switch
5) Forget about Pin 9. That's for 5 Volts DC - Out. Used by factory.

Which wires coming out of the Front Panel, are the Power On wires, Harddrive LED light wires, Power On switch wires, etc.?

Remove the Front Panel, and trace where the wires end.

IF, the wires already installed coming from the motherboard to the Front Panel, are Too short, you should make notes before you remove them from the motherboard.

Note what color pair of twisted wires, went to where, in the Front Panel.
Compare to the chart of the Front Panel header given above.
(IF any wires are still connected to the Front Panel header on the motherboard)

Once the Front Panel is removed, it's usually pretty easy to trace the two wires up to the Power On switch.
Same for the Power On LED light.
Again, same for the HarDDrive activity LED light.

The SATA harddrive requires a DATA cable, and a SATA power cable.

The connector for a Data cable has 7 contact pins. It is the shorter connector.

http://en.wikipedia.org/wiki/File:SATA_Data_Cable.jpg

The connector can be at a 90 degree angle as shown, or a straight connector.
IF the data cable has an angled connector, it plugs into the Harddrive.
Straight connector goes to the motherboard.

The connector for a SATA power cable has 15 contact pins. It is the longer connector,

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

Note the L shape of the connectors for the SATA data cable, and SATA power cable.

Also;
This is a 4-pin standard Peripheral power cable. Commonly misnomered as a 'Molex' power cable,

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

IF, the SATA harddrive has a provision for a SATA power cable, AND a 4-pin standard Peripheral power cable, ONLY use just the SATA power cable.

Using both power cables will burn up the harddrive.
May not happen immediately in some cases, but WILL eventually happen.

For additional questions please post in a Comment.

Regards,
joecoolvette

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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.

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Over the last few months our PC is difficult to start up - we have to keep pressing the on button sometimes 20 or more times while the amber light is flashing then maybe it'll start - could it be a faulty...


If it is not the physical start button and the power supply is OK something you can look for yourself is a blown capacitor on the motherboard. They should have flat tops. The one pictured here is from a Dell 5150 Connolly E187242 motherboard that I am currently working on and you can see that the top is not flat but rounded. I am not an expert and it could be something else but I feel this is worth checking out.
3b40ccf.jpg

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

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1 Answer

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