Can you jumper PSU Green/Black to power on a PC?

[Sasqui]

Got a friends DELL pc that has intermittent power-on problems. Had to push the case power button numerous times (like a LOT) before the PC would turn on. It progressively got worse, now won't power on at all.

Question (ok two):

Can you jumper the green/black PSU-Motherboard wires to turn on the PC WHILE IT'S PLUGGED IN to the MB? I've never done that before, but powered up plenty of PSU's while they weren't plugged into a MB.

I found the header on the MB from the case switch, but don't know what pins are the power-on ones. The DELL service tag is 9TR3VK1 ...is there any way to get a pin diagram from DELL?

TIA!

 

[natr0n]

I would remove the psu and jumper it on its own to see if it works first.

Could be a faulty power switch on the case as well.
Could be motherboard has gone bad too.

 

[Ebo]

Cant you see which pins that the powerbutton is connected to on the MB ?.

Just put a jumper on them then.

 

[natr0n]

Cant you see which pins that the powerbutton is connected to on the MB ?.

Just put a jumper on them then.

Thing is some Dells have proprietary connections usually.

 

[Sasqui]

Cant you see which pins that the powerbutton is connected to on the MB ?.

Just put a jumper on them then.

I found the header clear as day, but don't know what pins to jump.

 

[Ebo]

Can you find the model no on Dells website and look for a manual ?

 

[Sasqui]

Can you find the model no on Dells website and look for a manual ?

http://www.dell.com/support/home/us/en/04/product-support/servicetag/9TR3VK1/manuals

Manual here: http://downloads.dell.com/manuals/a...sktop/studio-desktop_service manual_en-us.pdf

Towards the end they show the FPANEL connector, but no details

 

[natr0n]

http://en.community.dell.com/cfs-fi...components-files/3514/0638.fp_5F00_header.jpg

 

[Bill_Bright]

I found the header clear as day, but don't know what pins to jump.

You short the two pins with the two wires that lead back to the case's front panel power button and yes, you can short the two pins while those wires are attached with no problems. That is exactly what pushing the button does (if working correctly).

If the PSU and computer starts up properly every time when you short those two pins, then your button switch is likely bad. Some times, the mechanism to hold the button properly in place becomes loose and you can just bend it in back tight. If plastic, then you cannot bend it back. If this case has a Reset button too, you can just swap the two wires from the reset button and put them where the power buttons went on the motherboard. Then use the Reset button for power from now on.

But understand your symptom (needing to press the power button a bunch of times) often indicates the power supply is failing, not a bad switch.

 

[Sasqui]

http://en.community.dell.com/cfs-fi...components-files/3514/0638.fp_5F00_header.jpg

Worth a shot, looks like the same pins on this MB. I'll report back

Edit:

But understand your symptom (needing to press the power button a bunch of times) often indicates the power supply is failing, not a bad switch.

Yeah, that's what I'm afraid of.

 

[Bill_Bright]

I caution you about a couple things. There is NO mandatory industry standard for the pin-outs of motherboard front panel I/O headers. So while that image above came from Dell, do not assume it is correct for that THAT specific motherboard. Get in carefully with a bright light and read the labels and/or carefully follow the wires back to the switch.

Also, it is only in recent years the "suggested" color coding for wires became standardized. So, when dealing with power, it is best to go by pin number and actual labels rather than colors - this is especially true with older systems.

 

[Sasqui]

Motherboard must be toast, shorting the pins does nothing. I can power up the PSU either alone or connected to the MB. When connected to the MB, fans spin up, etc. but no video signal. I've always wondered about the relay circuitry between the power header on the MB and PSU... it's a mystery to me.

 

[Frick]

Or you can be a man and just short random pins until it powers on.

 

[Sasqui]

I caution you about a couple things. There is NO mandatory industry standard for the pin-outs of motherboard front panel I/O headers. So while that image above came from Dell, do not assume it is correct for that THAT specific motherboard. Get in carefully with a bright light and read the labels and/or carefully follow the wires back to the switch.

Carefully, lol. I shorted just about every pin I could with a screwdriver, no life whatsoever.

Or you can be a man and just short random pins until it powers on.

LOL, you beat me to it.

 

[jboydgolfer]

Carefully, lol. I shorted just about every pin I could with a screwdriver, no life whatsoever.



LOL, you beat me to it.

I had an issue similar to this on an old Dell OptiPlex I don't recall the model. What I ended up doing is pulling the CMOS jumper pin and then putting it back on while hitting the power button and it would start up every time. Worth a shot

Or you could short it with the pair of pliers while powering it on

 

[Sasqui]

I had an issue similar to this on an old Dell OptiPlex I don't recall the model. What I ended up doing is pulling the CMOS jumper pin and then putting it back on while hitting the power button and it would start up every time. Worth a shot

Or you could short it with the pair of pliers while powering it on

Totally worth a shot. The DELL manual does show the CMOS jumper location and a reset password jumper right next to it.

Can't mess with this till tomorrow afternoon. Date night tonight!

...then a snowstorm tomorrow :/

 

[Caring1]

But understand your symptom (needing to press the power button a bunch of times) often indicates the power supply is failing, not a bad switch.

With Dell Motherboards it can also indicate a bad Motherboard, or Capacitor in particular.
I've had a couple with that issue and the power button glows Green when running correctly, and Orange when malfunctioning.

 

[Bill_Bright]

With Dell Motherboards it can also indicate a bad Motherboard, or Capacitor in particular.

Of course! But that is with any brand motherboard and not just a Dell. And as I noted, it "often" indicates a failing PSU.