HP ProLiant Motherboard Jumpstart Pinout

[IamPritesh]

I have this HP ProLiant ML10 motherboard which is bricked as of now. This has a 10 pin front panel. For me its usually the 6 and 8 pin that needs to be shorted to start your mobo.
This is a server motherboard so its bit different I assume, does anyone know which pins needs to be shorted to imitate switching of power button?
I have attached the pics if that helps.

P.S - Pin number 8 is not connected to ground.

Also is there a schematic available for the same ?

[IamPritesh]

Re: HP ProLiant Motherboard Jumpstart Pinout

Anyone ? Thanks

[momaka]

Re: HP ProLiant Motherboard Jumpstart Pinout

With the motherboard plugged into a power supply and the power supply plugged into the wall, use a multimeter to see which one of these pins reads high (over 3.3V). Then short to ground with a 100-330 Ohm resistor each one of these pins (one by one) until mobo turns on - that's your PWR_SW pin. I use this method quite often on proprietary HP and Dell mobos.

[IamPritesh]

Re: HP ProLiant Motherboard Jumpstart Pinout

With the motherboard plugged into a power supply and the power supply plugged into the wall, use a multimeter to see which one of these pins reads high (over 3.3V). Then short to ground with a 100-330 Ohm resistor each one of these pins (one by one) until mobo turns on - that's your PWR_SW pin. I use this method quite often on proprietary HP and Dell mobos.

That is a great idea. Why a 100-300 ohm resistor in this case ? On usual boards you just short it with the screw driver

[momaka]

Re: HP ProLiant Motherboard Jumpstart Pinout

Just because it's an HP OEM board and it might have jumper pins on there connecting directly to the power supply's 5VSB/3.3VSB rail. This leaves the possibility of sending 5V/3.3V to a signal line that is not designed to take that much and damage something. With a 100-300 Ohm resistor (actually probably anything from 20 Ohms to 470 Ohms will do), you don't risk shorting anything.

[IamPritesh]

Re: HP ProLiant Motherboard Jumpstart Pinout

Just because it's an HP OEM board and it might have jumper pins on there connecting directly to the power supply's 5VSB/3.3VSB rail. This leaves the possibility of sending 5V/3.3V to a signal line that is not designed to take that much and damage something. With a 100-300 Ohm resistor (actually probably anything from 20 Ohms to 470 Ohms will do), you don't risk shorting anything.

Thanks for the clarification. I checked the voltage on the pins and there are two pins that shows some kind of voltage and one is 0.25 and another one is 0.35 volt. How should I proceed ?

[momaka]

Re: HP ProLiant Motherboard Jumpstart Pinout

The two pins that show a voltage - short them to ground with a resistor, as I mentioned above. One of them should turn on the motherboard.

[IamPritesh]

Re: HP ProLiant Motherboard Jumpstart Pinout

The two pins that show a voltage - short them to ground with a resistor, as I mentioned above. One of them should turn on the motherboard.

Thank you sir. Tried but it still does not turn on. Could you please look into this thread which gives a better picture of my motherboard issue.
https://www.badcaps.net/forum/showth...409#post853409