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Possible Motherboard Issue?

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Unread 17-01-2017, 09:59 PM   #1
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Possible Motherboard Issue?

I have an MSI 970 gaming motherboard. I noticed my GPU was getting really hot (85C) so I powered the computer down. I opened it up and blew everything out, and when I went to turn it back on, nothing. Nothing at all, no POST, no LEDs, nothing. So I reseat everything, thinking I just knocked something loose. No joy. Well my fans have been getting dirty, maybe it was drawing a lot of current and finally killed my PS. So I pull the PS, short the PS-ON to ground and test all the voltages and it seems fine. I put it all back together, it still won't turn on, so I manually short the PS-ON to ground while it's plugged in, and it fires right up. Computer runs fine with a paperclip between those two pins. So I check the power button, it is applying the short when pressed to the mobo (as it should). The moment the short is removed from the PS-ON and GND, the computer shuts off.

I'm not entirely sure what mechanism shorts that to ground once the computer is on though. There is a momentary short when you press the power button, but the connection between PS-ON and GND doesn't remain after that for some reason. Holding the power button doesn't work either. Anyone have any ideas? What's really killing me is it was working more or less fine (other than running hot), I shut it down properly, and now it won't fire up.

One final note that I'm not quite sure what to do with yet is that I was able to get the computer to momentarily light up when messing with the main PS plug to the mobo. Almost like an intermittent connection, but ohming them out hasn't found any so far.

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Unread 19-01-2017, 07:07 PM   #2
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Re: Possible Motherboard Issue?

The short that powers on the PSU is supposed to be momentary. If your PSU only stays on while there is a short, there's something wrong with it. Do you have a spare you can try?
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Unread 20-01-2017, 01:22 AM   #3
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Re: Possible Motherboard Issue?

No I don't have a spare that would run this one unfortunately. I thought that the ground provided by the case button is momentary, but the motherboard latches that ground from Green to Black until you shut down the computer? I dunno. I even checked to make sure the wires in the PS cable were actually connected to the pins and everything. It's not causing any other problems now. I made a little paperclip jumper to stick in the back of the plug and it all works fine now . I have to hit the switch on the PS after I shut the computer down because the fans, lights, and peripherals all stay on though lol.
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Unread 20-01-2017, 11:57 PM   #4
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Re: Possible Motherboard Issue?

http://www.formfactors.org/developer...20PSDG2.01.pdf
Quote:
When PS_ON# is pulled to TTL low, the power supply should turn on the four main DC output rails: +12VDC, +5VDC, +3.3VDC and -12VDC. When PS_ON# is pulled to TTL high or open-circuited, the DC output rails should not deliver current and should be held at zero potential with respect to ground.
You're right, sorry.

So there is something wrong with the motherboard, but maybe it's just this. If you have no other problems and you're comfortable using a paperclip to rig it, it should be fine.

Did your temps improve at all?
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Unread 21-01-2017, 01:06 AM   #5
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Re: Possible Motherboard Issue?

Hey no worries, thanks for answering. Yeah I think it almost has to be in the motherboard at this point. I've kind of just resigned myself to the paperclip jumper "fix" until I build my next computer in a few months. My temps are looking better, it's still a mystery how my gpu fan got set to 57% to begin with. Definitely one of the stranger troubleshoots I have done lol.

I realize that might not have made sense. When I noticed my fans were loud, I checked speedfan and my GPU fan was set to 57% for reasons I'll never understand
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Unread 21-01-2017, 07:08 PM   #6
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Re: Possible Motherboard Issue?

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Well most GPUs won't shutdown until they hit 105C, they can handle higher temperatures than CPUs can. Anything below 90C will not harm it at all. You can adjust the fan curve with Afterburner though if you want.

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