motherboard power switch header

Funkygreendogs

Just wondering if anyone can help me, im trying to put together a system from old parts lying about and ive got this motherboard im trying to boot its an old(ish) compaq mobo im not sure from what system but after googling some serial codes (007296-101) this looks to be the very same: http://snipurl.com/116a4
although there is not much info on that site. Im not exactly sure how to wire the switch to the power switch header:

its a 10pin connector and ive tried just shorting a few obvious contacts together to see if it would boot but to no avail **EDIT=the powersupply does switch on when connected and as does the hdd+fans**. Has anyone got any useful links on technical information for this type of thing, even thought i do not know which system the mobo is from, or know how i should go about booting this mobo up it would be much appreciated!!!

jay

Ruu_Old

Is there an FCC-ID (number+digits) located on the motherboard? Might be able to track down the make/model of it from there and maybe get a manual for it.

leeroybrown

Are you 100% sure that that is the power connector? For my money that 10 pin connector would be for one of the strange PCI riser mouse connectors that some systems had back then. Are you sure there isn't a set of ordinary power jumper pins somewhere else on the board?

Funkygreendogs

there might be an FCC-id number on it somewhere im just not sure what to look for? maybe if you can give me an example number i could try find it from that?

leeroybrown: im pretty sure its the power switch header its labeled near it and also i measured the voltages on some of the pins are 12v so i doubt its for a mouse connector

Ruu_Old

This website might be some use, let me know how you get on.

Funkygreendogs

no such luck, there doesnt seem to be an fcc number on it anywhere, although on that site it says something about it has to be a communications device like a modem or a lan card to have one, the only identifying numbers are: SP#, DG#, AS# and the serial number i tried some of these anyways for the crack but nothing turned up, anyways ive posted on that websites forum for information so hopefully there should be a reply in the morning

Funkygreendogs

just noticed theres a number on the mobo cover it says:
BPE: 247110-016
749 REV AH

Hope thats some help....

Funkygreendogs

Ok i have found out that the motherboard came from an old compaq deskpro 2000 i have since read technical documentation and any manuals i could find but NOWHERE does it mention the pin outs for the power switch header, there seems to be an obscure reference to a similar motherboard that describes the power switch as grounding a pin which then starts the boot process can anyone confirm this? How exactly are compaq motherboards switched on??
The copyright stamp on the board is 96/97 so that should give an idea of how old this board actually is, any help on this is much appreciated

Alun

Is it possible that being of that kind of vintage that this is a pre-ATX era machine? If so, it won't have a switch header on the motherboard, and will simply power on when it gets power from the PSU which will have it's own (real rather than soft) switch. I don't think you'll be able to use an ATX power supply in this case, but maybe you could hack it to work.

Funkygreendogs

yea actually the psu does power on when it is switched but on the motherboard the power leds do not turn on and in the picture i originally posted it is labelled 'power switch header' beside the connector. i am using an atx power supply though...

Ghost Train

The photo is not very clear, is the connector labeled P5?
Is the second pin blank?
Given how the service manual describeds the connector in a general service manual it seems the pins are only for leds and the power switch

Saw this on another board, seems consistent with service manual description, pins 10,11 scsi, 1-9 led and power switch, but use at your own risk

Pin 1: HD LED -
Pin 2: key
Pin 3: HD LED
Pin 4: PS LED +
Pin 5: PS LED -
Pin 6: pulled down to GND
Pin 7: power button
Pin 8: NC
Pin 9: ground
Pins 10,11: SCSI LED

shorting 6 & 7 for a second I would think
shorting it for a few seconds might be the reset

Funkygreendogs

Thanks for the reply man, i tried shorting the 6th and 7th pins there and a few more in case im reading from the wrong side but it still doesnt seem to be booting no the second pin is not blank
I apologize for the crappy photo but my little camera doesnt like the dark ill take a clearer one tomorrow. There is only 10pins and im not sure but it might be labelled P100 but its labelled power switch header aswell, i tried shorting pin6 to ground but im not sure what to do with the 7pin then, what is that key on pin2 for??

Ghost Train

Key just means there's no pin there to connect, means the connectoor that goes on to the pins can't be connected upside down

Pull down to GND would be like a resistance you connect the power button pin with to trigger the power up

pin 1 should be marked, probably laid out like this
13579
24680

If you have a multimeter/voltmeter you could connect the negitive to the case and with the positive probe test which pin has a voltage on it, since the power is off the only pin with a voltage should be the power button pin

Do you know if the power supply you have is the right type for the motherboard? A compaq powersupply might be slightly different to a normal supply, also are you sure the motherboard is working and not faulty

good luck with it, hope you get it working