Question about IBM (02R4087) Motherboard

1 Answer

I cannot see where on the motherboard to connect reset sw, power sw, power led and hddled. Also 2 red wires (1-5V and 2-5V); 2 white wires (1-D and 2-D), 2 blue wires (1+D aand 2+D) and 2 black wires (1ground and 2 ground) Motherboard IBM P4 2001 (also written FRU25P5090) Problem occurs when I'm replacing another motherboard with this one. Tried to find labelled connection points in vain

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  • 4 more comments 
  • David Nov 19, 2010

    Thank you - your solution was helpful. I take your point abvout the original IBM case. However, I need more info:

    1. Each of the connectors (reset sw, power sw, power led and hddled) has two wires (blue & white, yellow & white, green & white, red & white respectively) - which way round do they go? Is it always for each pair 'white on the right' or not? Can any harm be done connecting them the wrong way? I'm not trying anything until I know this ...

    2. You haven't told me anything about the other 4 sets of wires mentioned in the latter part of my question - where are they connected?

    Look forward to your response.

  • David Nov 20, 2010

    Thanks for the further input - sorry about the delay in replying - work and sleep intervened!
    The diagram and first picture show the connections I've made:
    · · · · · · · ·
    1 2 3 4 5 6 7 8






    Touching pins 1 & 2 started the computer; so did touching pins 3 & 4; not the other 4 pins. So I decided to follow the order of colours of the cable and have connected white, blue, white, yellow respectively to pins 1 to 4. Now the computer starts when I press the front panel on/off button, and also when I press the reset button. They behave exactly the same.
    The only way to turn the computer off is to hold the on/off button (or reset button) for several seconds, or to pull out the power cable.
    The computer does not beep at all - it should, shouldn't it?

  • David Nov 20, 2010

    Pictures 2 and 3 relate to the other wires - they do indeed come from the front panel USB ports. Do they perhaps connect to one of the other places that I've arrowed on the motherboard? What are those places for otherwise?

  • David Nov 20, 2010

    Your previous reply is preceded by #; my response to your previous reply is preceded by **:
    # You either got faulty ram, cpu, video card, or mainboard if the machine is not powering on -- you don't get picture out of it.
    ** I’ve tried 3 different PC 100 RAM modules, and 1 PC 133 module separately, as well as the first 3 all together – same result: fan comes on, no beeps, no picture. Note: I’ve only just connected the video card now – before there was nothing connected, only the RAM in place. I have not got so far as connecting a HDD.
    # Try removing all the ram and power on, wait 20 seconds unplug, reseat one ram module and try powering on again
    ** I’ve tried this, and sadly it doesn’t help. But the computer beeps when there’s no RAM; pattern of beeps 1 3 3 1 – is that significant?
    # test all the components to confirm that they are OK
    ** I don’t know how to test the components – is there a simple way?
    Any other suggestions?

  • David Nov 20, 2010

    My response to your previous reply is in red, bigger font:

    You either got faulty ram, cpu, video card, or mainboard if the machine is not powering on -- you don't get picture out of it.

    I've tried 3 different PC 100 RAM modules, and 1 PC 133 module separately, as well as the first 3 all together - same result: fan comes on, no beeps, no picture. Note: I've only just connected the video card now - before there was nothing connected, only the RAM in place. I have not got so far as connecting a HDD.

    Try removing all the ram and power on, wait 20 seconds unplug, reseat one ram module and try powering on again

    I've tried this, and sadly it doesn't help. But the computer beeps when there's no RAM; pattern of beeps 1 3 3 1 - is that significant?

    test all the components to confirm that they are OK

    I don't know how to test the components - is there a simple way?

    Any other suggestions? L

  • David Nov 22, 2010

    I haven't done anything over the weekend - busy with other commitments. I'll get back to you by tomorrow latest - thanks for you patience

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  • IBM Master
  • 13,433 Answers

Its a special case, the connectors are above the 20pin main power cable.
the original ibm case would have a front panel connector that fits there, you have to use a screw driver, to find which of those pins turn the machine on and which reset it.
As for the leds, once you have found the power and reset, they will be on the remaining pins I cannot see where on the motherboard to connect - ekse_18.jpg


use a flat metal screw driver to connect two pins for a second to find out which two will start up the machine.

here is a pin out from another ibm mainboard
ekse_19.jpg


the connector looks like the same on as on your machine but it might be different don't be afraid to use your screwdriver.

Posted on Nov 18, 2010

  • 7 more comments 
  • Ekse Nov 19, 2010

    on the power and reset it does not matter which way they are. To find out the polarity of the remaining connectors use a digital multimeter to measure the voltage from the pins when it shows + then you know whats + and whats -.







    As for the other wires I have no idea what they are. What or from where are they coming from?

  • Ekse Nov 19, 2010

    Oh I think I know what they are, they are the front panel USB connectors right? or where do they come from?





    They are connected to a USB header. But looking at the motherboard I don't see any USB headers.




  • Ekse Nov 20, 2010

    Hey,



    I don't see any pictures, email me directly at nikoht@gmail.com





    There is a problem with your machine, these wires being attached or not attached won't affect the computer starting up and turning off properly. the power button only connects two pins together to power on and does noting else. Reset also connects two wires together to pass along a reset signal.





    You either got faulty ram, cpu, video card, or mainboard if the machine is not powering on -- you don't get picture out of it.





    Try removing all the ram and power on, wait 20 seconds unplug, reseat one ram module and try powering on again.





    test all the components to confirm that they are OK.

  • Ekse Nov 20, 2010

    The connector in the bottom right of the mainboard next to the speaker and battery is the floppy drive connector.





    the one in the bottom left corner is something special.





    And then we have the power connectors at the top picture.





    When I was looking for the pinout of the powerconnectors I found this picture




    If you look at the bottom right "special" connector you see there are 3 jumpers connecting each 2 pins together.



    It is possibly a front panel audio connector + something else In one. or it might be a LPT port for a printer.





    This mainboard is far from standard connectors.





    This looks like the pinout of the power switch connector.




    ,--------,

    '12345678'

    '--,__,--'



    Pin Colour Description

    1 Black HDD LED (Gnd)

    2 Yellow HDD LED (+ve)

    3 Green Power LED (+ve)

    4 Black Power LED (Gnd)

    5 Yellow Power Switch (Pair 1)

    6 Black Power Switch (Pair 1)

    7 Black Power Switch (Pair 2)

    8 Yellow Power Switch (Pair 2)

  • Ekse Nov 20, 2010

    the pinout is upside down. So you would connect the HDD led Black wire to the other end of the pins and to the one next to it the side of the led. Next the power led, its a and then the last one next to the power switches is ground for that led.


    So there is no reset switch, or then it works in some strange way that I've not seen before.

  • Ekse Nov 20, 2010

    Seems like I can post a plus sign ( + ) for some reason.



    the pinout is upside down. So you would connect the HDD led Black wire to the other end of the pins and to the one next to it the positive (+) side of the led. Next is the power led positive (+) pin and then the last one next to the power switches is ground for that led. So there is no reset switch, or then it works in some strange way that I've not seen before.

  • Ekse Nov 21, 2010

    did you send a comment? sorry I don't see it

  • Ekse Nov 21, 2010

    there is something wrong with this page, could you contact me via email for further assistance, also sent me the last comment(s) that you wrote here, I can't see a thing for some reason.

  • Ekse Nov 22, 2010

    Hey, something is wrong with this webpage and I can't see a thing, email me at nikoht@gmail.com

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