Thread: M2-ATX J9 - External Power Switch - Busted?

Sounds like this problem I had:

http://www.mp3car.com/vbulletin/powe...iscovered.html

No, it's not the same. I know you have to first give the M2 an IGN on signal before you can use the J9 power button.

That's what I meant by saying the M2 had power with the LED. The jumper you have with the 2 hours hard off means that the M2 will stay powered for 2 hours. In those two hours if you PC is off I should be able to use the J9 power button to power my PC on.

Thanks for the reply.

J8 and J9 are hard wired together.

What do you mean J8 powers the motherboard fine?

You should have (Mobo power header) -> J8, then shorting J9 will start the motherboard.

J8 is connected directly to the motherboard.

J9 is connected to a momentary push button switch.

When I turn my truck on the IGN signal is sent and the motherboard powers up and works fine.

When I turn my truck off, the motherboard shuts down correctly. I should now have 2 hours to be able to power up the motherboard by using the J9 switch.

When I press the J9 switch nothing happens.

Does that make sense?

Yes it makes sense.

Option 1) - connection between J8 and J9 is broken. Easy to test, try to power on mobo by shorting pins on mobo, try swaping mobo power from j8 to j9, check continuity between j8 and j9. Very unlikely.

Option 2) - the mobo may only be powering on due to the m2 atx kicking in, not from the IGN signal (is your BIOS set up to resume on power on?). Double check cable runs to right pins on mobo

Originally Posted by Nerd2

Option 2) - the mobo may only be powering on due to the m2 atx kicking in, not from the IGN signal (is your BIOS set up to resume on power on?). Double check cable runs to right pins on mobo

The M2 doesn't come on until it gets the IGN signal which in turn sends the signal to J8/J9 to power on the motherboard, right?

Originally Posted by tbird2340

The M2 doesn't come on until it gets the IGN signal which in turn sends the signal to J8/J9 to power on the motherboard, right?

Yep - what may be happening is the M2 is sending the signal to J8/J9 but that is getting ignored by the motherboard for some reason (explaining the failure of J9 to work). The motherboard may STILL turn on, just from noticing that power has arrived. Some BIOS's do this. Think of some PCs turning on automatically just from having the power cord plugged in.

There are loads of simple tests you can do to rule this out though.

Originally Posted by Nerd2

There are loads of simple tests you can do to rule this out though.

The first being simply take the cable going from the motherboard header which I *assume* is working and move it to J9 instead of J8?

Originally Posted by tbird2340

The first being simply take the cable going from the motherboard header which I *assume* is working and move it to J9 instead of J8?

Yes.

Second, remove it completely.