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#861308 - 28th Feb 2014 12:55pm PC PSU just a loan if possible
CustomIce Offline
The IceMan commeth
Wise One

Registered: 3rd Dec 2006
Posts: 847
Loc: Wirral
Hope somebody can help.

I have aquired a replacement to my ailing PC, but sorting it out for a new OS it seems the PSU has died.

The PC is a dell precision 390, with what seems to be a small profile ATX PSU 24 pin main connector with the 12v 4 pin processor power connector, now if anyone has a spare psu that is at least 400W that i could borrow to prove if it is Motherboard or PSU fail i would appreciate it.

Thanks

Guy

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#861312 - 28th Feb 2014 1:35pm Re: PC PSU just a loan if possible [Re: CustomIce]
_Ste_ Offline


Wiki Master

Registered: 7th Aug 2005
Posts: 16021
Loc: New Brighton
hi guy,

if you cannot get one you could possibly use a multimeter to check the correct voltages on the 24 pin connector.

search google for the schematics of your particular model but heres an example...





Most cpu units and their colours reprisent the same voltages but not all so best to check your particular model to be on the safe side.
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#861314 - 28th Feb 2014 2:08pm Re: PC PSU just a loan if possible [Re: CustomIce]
CustomIce Offline
The IceMan commeth
Wise One

Registered: 3rd Dec 2006
Posts: 847
Loc: Wirral
Yes I cold do that, but i'm not 100% if one of the sense wires is the fault, and as far as i can tell the PSU won't output all rails unless it's given the soft start input, it's like the PC is locked into standby/hibernate. So the PSU is in an offline state, i'll diss the conn from the board and see what i get on the 5 and 12v rails, if down or no O/P i'l assume it's either in standby or bust.

Thanks so far Ste

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#861315 - 28th Feb 2014 2:18pm Re: PC PSU just a loan if possible [Re: CustomIce]
CustomIce Offline
The IceMan commeth
Wise One

Registered: 3rd Dec 2006
Posts: 847
Loc: Wirral
Ok further to above, I have 3.3V rail and 5V rail no 12V or -12V pus disconnected from MB won't spin up the fan so could either be in sleep or broken, hence the requirement for a loan unit, could be a fault with either still.

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#861328 - 28th Feb 2014 3:30pm Re: PC PSU just a loan if possible [Re: CustomIce]
Mark Online   Reading


Wiki Master

Registered: 9th Nov 2003
Posts: 21062
Loc: Wirral
Plug all the other bits into the board.

Memory and keyboard.

I had this a while back and it was the front panel connectors that needed to be in correctly before it spun up.

What age is the MB do you know if it was working prior ?

Sorry I don't have a spare PSU.

If its a brand new MB look for the "RED" jumper on the mother board its a cmos reset in the wrong position.

I call it red, but it could be black.
There was a time Motherboards were shipped out this way.
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#861335 - 28th Feb 2014 4:50pm Re: PC PSU just a loan if possible [Re: Mark]
CustomIce Offline
The IceMan commeth
Wise One

Registered: 3rd Dec 2006
Posts: 847
Loc: Wirral
Hi Mark,

I'll re do the measurements, but i have had the whole thing dissed and replugged so may times. Age 4 years old, was working until a reboot after bios reset, then nowt frown

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#861438 - 28th Feb 2014 8:30pm Re: PC PSU just a loan if possible [Re: CustomIce]
Mark Online   Reading


Wiki Master

Registered: 9th Nov 2003
Posts: 21062
Loc: Wirral
A daft one but screw it in to earth it on the tower.
Stranger things have happened.

Check the 24 pin
Make sure none of the pins have been pushed back up.
Thus preventing the contact.
Or tug on each of the cables to the block to make sure there not loose.
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#861523 - 1st Mar 2014 1:35am Re: PC PSU just a loan if possible [Re: CustomIce]
lord_thomas Offline
Newbeee

Registered: 4th Jan 2013
Posts: 43
Loc: birkenhead
I have a tool to check all outputs from psu, also can loan a psu to try
I am sure the Dr can do this for you

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#861524 - 1st Mar 2014 1:51am Re: PC PSU just a loan if possible [Re: CustomIce]
lord_thomas Offline
Newbeee

Registered: 4th Jan 2013
Posts: 43
Loc: birkenhead
Dell may also require its own psu I think the -5v is not used in the 20 pin output

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#861665 - 1st Mar 2014 8:52pm Re: PC PSU just a loan if possible [Re: lord_thomas]
CustomIce Offline
The IceMan commeth
Wise One

Registered: 3rd Dec 2006
Posts: 847
Loc: Wirral
Originally Posted By: lord_thomas
I have a tool to check all outputs from psu, also can loan a psu to try
I am sure the Dr can do this for you


If said tool will bring the PSU out of standby i'd be up for that, then i can check vs standard ATX PSU pinout if they match.

I have heard about Dell being sneaky and using what looks like ATX connectors and calbling colour with non standard config!

Need to prove it first!

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#861670 - 1st Mar 2014 9:06pm Re: PC PSU just a loan if possible [Re: CustomIce]
beanie65 Offline
Member

Registered: 21st Dec 2012
Posts: 70
Loc: wirral
You wont get a reading on you 12v rail unless you make a circuit between the green wire and the black one next to it, this is the switch to turn the psu on, your fan should spin up once you do this.

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#861671 - 1st Mar 2014 9:12pm Re: PC PSU just a loan if possible [Re: beanie65]
beanie65 Offline
Member

Registered: 21st Dec 2012
Posts: 70
Loc: wirral

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