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Dell Dimension 2350


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#1 Braxton

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Posted 05 February 2009 - 12:01 PM

I think my power supply may be out but wanted to check everyones opinions. I have tried to find another one just to try but am having no luck. The computer just will not trun on. I took the side cover off, and when it is plugged in the green light on the mother board flashes constantly and will flash for about 30 seconds after it is unplugged. It keeps getting slower until it shuts off though. I did check the battery on the board and it tested good.

Just curious as to if there is anything else to test or if it is probably the power supply? Gonna order a new one if it is. Thanks

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#2 dc3

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Posted 05 February 2009 - 12:05 PM

You can use the technique below to test the PSU.

It would help a great deal if you could post the make and model of this computer.


The purpose of this procedure is to bypass the motherboard to test the PSU.

Caution:
This procedure will involve working with live 12VDC electrical potentials which if handled improperly may lead to electrical shock. Proper precautions should also be taken to prevent electrostatic discharges (ESDs) within the case of the computer. For safety purposes please follow the instructions step by step.

First, shutdown your computer. Then unplug the power cable going into your computer.

Once you have opened the case, touch the metal of the case to discharge any static electricity.

The connector of the PSU which connects to the motherboard is readily recognizable by the number of wires in the bundle. To disconnect it you will need to press on the plastic clip to disengage it and then pull the connector up and away from the motherboard. Please take notice of the location of the locking tab and the notch on the socket of the motherboard, this will only connect one way as it is keyed. This wire bundle will have a memory of the way it has been installed and will want to bend back that direction, you may have to play around with it to find a position that the connector will stay in the same position while you run the test.

Posted Image

From the top left to right the pins are 13-24, the bottom from left to right are 1-12.


Please notice that there are PSUs with 24 pin and 20 pin connectors, the location of the green wire in the 24 pin connector is #16, and the green wire in the 20 pin connector is #14. If you look at the connector with socket side facing you and the clip on the top the number one pin will be on the bottom left corner. This makes the pin out for the 24 pin connector from left to right 13-24 on top, and 1-12 on the bottom. The pin out for the 20 pin connector from left to right is 11-20 on top , and 1-10 on the bottom. If you look at the connectors you notice that these are sockets that fit over the pins on the motherboard where the PSU cable attaches, this is where you will place the jumper. For a jumper you will need a piece of solid wire about the size of a paper clip (20-22 awg), preferably a wire with insulation. It will need to be large enough to fit firmly into the socket so that it will not need to be held in place while testing. You are at risk of electrical shock if you are holding the jumper when you power up the PSU. Insert one end of the jumper into the socket of the Green wire, and insert the other end into the socket of any Black wire.

Once the jumper is in place plug the cord back in. If the PSU is working properly the case fans, optical drives, hdds, and LEDs should power up and remain on. I would suggest that you not leave this connected any longer than is necessary for safety purposes.

At this point you can use a DC Voltage meter to read the different rail Voltages. You will want to insert the black probe into any of the Black (-) sockets, and insert the Red (+) probe in the five different colored sockets, one at a time. Below are the five different colors and their corresponding rail voltages. The Voltages should be within about ten percent plus or minus of the given values.

Yellow +12VDC

Blue -12VDC

Red +5VDC

White -5VDC

Orange +3.3VDC

To reconnect the 20/4 pin connector unplug the power cord, remove the jumper, and reconnect the connector. Take a moment at this time to make sure that nothing has been dislodged inside the case.

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#3 Braxton

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Posted 05 February 2009 - 12:11 PM

Thanks for the reply. Dell Dimension 2350 was the only number I saw on it, but I will look it over again when I get home. The only other number I saw on the comp were like Dell job numbers I guess from when it was built? I will print this off and try the test. Any other info that may be helpful or anything I may need to look for to help diagnoss the problem?

Also, I take it by reading through this that if the jumper turns nothing on the power supply is bad. If it does turn on the supply is good and then I am on to look at what being bad next?

Edited by Braxton, 05 February 2009 - 12:15 PM.


#4 dc3

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Posted 05 February 2009 - 12:20 PM

My apologies, I didn't see the make and model in the title. :thumbsup:

Edit: I just wanted to check to see that the PSU was a ATX type, Dell has used proprietorial hardware in the past including hdds. Not only were the dimensions different from a ATX model the pin configuration was different as well. The technique that I posted is for a ATX PSU.

Edited by dc3, 05 February 2009 - 12:51 PM.

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#5 fairjoeblue

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Posted 05 February 2009 - 01:04 PM

The Dimension 2350 has error code diagnostic lights on the back of the computer,
Get it where you can see the back of it , get the diagnostic code
Then go here to find out what the code indicates,

http://support.dell.com/support/edocs/syst...ced.htm#1218079
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#6 Braxton

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Posted 05 February 2009 - 02:06 PM

Thanks I will check that also.

#7 Braxton

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Posted 05 February 2009 - 08:20 PM

I tried the jump wire. The fan on the power supply came on and the top cd rom would click like it was trying to power on and the led would just flash. None of the leds's on the other drives lit up or none of them even acted like they were trying to power on. What do I need to look at next or is it just the power supply?

I think it is just a 200w supply, so maybe a bigger one would be better anyway.

#8 fairjoeblue

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Posted 05 February 2009 - 10:09 PM

Did you check the error code lights on the back of the computer ?

[I do agree it sounds like the PSU though]
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#9 Braxton

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Posted 05 February 2009 - 10:32 PM

I honestly dont see any lights on the back of the computer.

#10 fairjoeblue

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Posted 05 February 2009 - 11:50 PM

The error code lights should be just below the keyboard & mouse ports.
If you go here & look at the illistration of the back of the computer they are # 2 .

http://support.dell.com/support/edocs/syst...our.htm#1101572

They aren't going to flash like strobe lights.
You'll actually have to have it where you can see them.
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#11 Braxton

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Posted 06 February 2009 - 10:31 AM

Yea, I have the tower off my desk and on the table where I could see everything. I was looking lower like around the usb ports and may have missed them. I will check again tonight, the way I read the codes though they are more for when the comp is on and won't read anything if it is in off mode and I can't get mine to even attempt to power on?

Edited by Braxton, 06 February 2009 - 10:34 AM.


#12 Braxton

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Posted 06 February 2009 - 10:34 AM

My apologies, I didn't see the make and model in the title. :thumbsup:

Edit: I just wanted to check to see that the PSU was a ATX type, Dell has used proprietorial hardware in the past including hdds. Not only were the dimensions different from a ATX model the pin configuration was different as well. The technique that I posted is for a ATX PSU.


I take it mine is an ATX b/c the wires were configured as listed. I woul dhave to look at it again tonight to be sure though.

#13 dc3

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Posted 06 February 2009 - 11:25 AM

Yes, it is a ATX form factor PSU.

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#14 Braxton

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Posted 06 February 2009 - 11:29 AM

Sooooo, aside from the diag. lights, what's it looking like or anything else to check? Or just buy a new psu?

#15 dc3

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Posted 06 February 2009 - 12:25 PM

If you have access to a Voltmeter set it to the DC Voltage scale and check out the voltages as seen in the testing technique.

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