New PSU not POSTing

[shortylickens]

Had an old generic power supply on my socket Am2 board with quad core phenom black. It required the use of the extra 4 pin CPU connector.

New Seasonic PSU has more features and modular connectors and stuff. Plugged in everything including one of the two extra CPU plugs.

Press power, nothing happens. Tried other 4 pin plug. Nothing happens. Test voltage with multimeter. Wall is 115 volts. PSU works.

Tried unplugging 4 pin CPU plug. Now the computer powers on but wont POST, nothing on the screen. CPU fan spins at full speed, the handful of interior lights all come on.
No diagnostic display so I cant be sure whats up.

Its this one:
http://www.seasonicusa.com/G-series-450-550-650.htm
in 550.

Doesnt specifically say that its AM2 compatible but I dont see the problem. Its got the 24 pin connector, and 2 extra 4 pin connectors.

Will upload video in a minute.

 

[shortylickens]

http://www.youtube.com/watch?v=mGrL_wKzsog

 

[Gillbot]

https://www.google.com/search?num=1...HNGt4AP2wIG4BA&ved=0CCsQBSgA&biw=1580&bih=712

 

[shortylickens]

https://www.google.com/search?num=1...HNGt4AP2wIG4BA&ved=0CCsQBSgA&biw=1580&bih=712

I hope you dont mine but my 3 years of high school classes, 2 years of Naval ET training and 12 years of electronic experience will not allow me to shove random loose metal into plugs.

Would there be some way I can use my multimeter to test it instead? Is it running 14 volts DC?

 

[imagoon]

I hope you dont mine but my 3 years of high school classes, 2 years of Naval ET training and 12 years of electronic experience will not allow me to shove random loose metal into plugs.

Would there be some way I can use my multimeter to test it instead? Is it running 14 volts DC?

With all the experience and you have never used a wire jumper before? I would figure you would have a few hundred of them around for breadboards etc. All you are doing is pulling the start signal to ground like the board would.

Jumper the connection, meter away to verify the voltages.

 

[shortylickens]

No, its not. Its 3 volts. Which I'm getting.

I dont know if I made this clear or not the power supply is turning on when just the 24 pin connector is hooked up. The CPU fan spins, the few lights I have inside the case turn on.
Its just not POSTing. No beeps. Blank screen.

When I hook up one of the extra 4 pin connectors the system doesnt come on at all, no PSU fan, no CPU fan, no lights.

My multimeter reads 0.4 volts on each of the individual 4 pin connectors. But thats only when the system is off and the PSU fan is not running.

Is that normal?

 

[shortylickens]

With all the experience and you have never used a wire jumper before? I would figure you would have a few hundred of them around for breadboards etc. All you are doing is pulling the start signal to ground like the board would.

Jumper the connection, meter away to verify the voltages.

RARELY, mostly we checked voltages against tech manuals to make sure we were getting what we were supposed to. Thats how we're trained. If for some reason you are getting high voltage on a particular point then jumping it would just fry more stuff that wasnt necessarily fried to begin with. Your way works fine, I'm sure, but its not how I was trained and never allowed to do work.

Since it seems to be a common practice I will go find an insulated wire and try it.

 

[shortylickens]

OK!


green pin jump worked. PSU fan comes on.

Also, when system is on but NOT posting, the extra 4-pin plugs each have 12 volts on them, which makes sense.

Now I know this is a motherboard problem.


THANKS GUYS!

 

[imagoon]

No, its not. Its 3 volts. Which I'm getting.

I dont know if I made this clear or not the power supply is turning on when just the 24 pin connector is hooked up. The CPU fan spins, the few lights I have inside the case turn on.
Its just not POSTing. No beeps. Blank screen.

When I hook up one of the extra 4 pin connectors the system doesnt come on at all, no PSU fan, no CPU fan, no lights.

My multimeter reads 0.4 volts on each of the individual 4 pin connectors. But thats only when the system is off and the PSU fan is not running.

Is that normal?

No, it's not what?

PS_on [green or pin 16 on the 24 pin ATX connector] is grounded to common [black, pin 3,5,15,17-19 plus a few more]. Grounding the signal pulls the PS_ON to ground which starts the PSU. From there you can check the voltages on the various connectors,

Orange 3.3v
Red 5v
yellow 12v
Purple 5v [standby should be live when the PSU is plugged in]
Grey: PWR_OK: 5V when the PSU feels it is "ok" if missing the System board pulls RST

 

[imagoon]

RARELY, mostly we checked voltages against tech manuals to make sure we were getting what we were supposed to. Thats how we're trained. If for some reason you are getting high voltage on a particular point then jumping it would just fry more stuff that wasnt necessarily fried to begin with. Your way works fine, I'm sure, but its not how I was trained and never allowed to do work.

Since it seems to be a common practice I will go find an insulated wire and try it.

Your comment makes sense in a power world where I wouldn't ever want to jumper 240V to ground for any reason. That is a signal wire and per spec it is pulled to ground to function. If you wanted to be really safe you would use a high ohm resistor like a 1m ohm to pull it down. ATX requires the PSU to be self limited though so a wire jump works.

I would never advocate random jumper wires though.

 

[shortylickens]

No, its not 14 volts. Its 3 volts, which is good.

I dont remember where I got that from. I think the heat under my desk is making me crazy.

 

[Gillbot]

No, its not 14 volts. Its 3 volts, which is good.

I dont remember where I got that from. I think the heat under my desk is making me crazy.

Go to Olds' basement. D: