Question about System Power Supplies

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Ground i am using DAC0808 and LF351.I am using batteries(5,10,15) to supply reqd. voltages. where to ground -ve of batteries??? with ground pin of the DAC or else where?????

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Ground is just a reference value.... connecting the -ve of batteries with ground pin of DAC is enough....

Posted on Feb 09, 2008

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Does a ATX power transformer makes the difference of watts of a power supply unit of a computer? Exactly I am planning to improve performance of my pc's ATX power supply unit. Trying to attach another...


NO NO NO... PC power supplies are switching supply's. The transformers use high voltage to drive other components. Increasing the power out of the supply will require you to upgrade the power supply to a higher wattage output.

Oct 23, 2013 | Microsoft System Power Supplies

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My compter is dead, and I just want to verify if it is the power supply, motherboard, or power switch. I have a EG351P-V. If I completely remove it from the computer, plug it in, and turn on the switch on...


No, don't start shorting anything yet! Here's a picture of the power connector:

pgh_pa_guy_11.jpg

Turn on the power switch on the supply, then short the green PS_ON pin (pin 14 or 16 depending on the style plug your supply has) to the black ground pin on either side next to it. DO NOT short across the plug to pin 4.

If the supply is working, this will cause the fan to start up and you can measure output voltages as shown on the diagram. (In fact, this is how the motherboard turns the supply on. The supply provides a 5-volt standby output as long as it's plugged in and turned on to keep the motherboard running to detect the power button. When you press it, the motherboard provides the PS_ON ground to fire everything else up.)

Be aware that without the load provided by the motherboard and other parts of the system, you may be able to measure output voltages (especially if you're using a digital meter) that may not be sufficient to run the system under actual operating conditions. Bad capacitors can cause the voltage to drop when loaded, and this will cause the dead system or other strange troubles. The best way to determine if a power supply is causing problems is by substituting a know good one into the system.

Dec 19, 2010 | Enermax (EG351P-VD) (eg351pvd) 330-Watt...

1 Answer

I want to convert this power supply for use with a battery charger for model aircraft. I need to know the color codes for the wires and also the pinout and which wire is the power on.


Pin Name Color Description
1 3.3V Orange +3.3 VDC
2 3.3V Orange +3.3 VDC
3 COM Black Ground
4 5V Red +5 VDC
5 COM Black Ground
6 5V Red +5 VDC
7 COM Black Ground
8 PWR_OK Gray Power Ok (is a status signal generated by the power supply to notify the computer that the DC operating voltages are within the ranges required for proper computer operation)
9 5VSB Purple +5 VDC Standby Voltage (max 10mA)
10 12V Yellow +12 VDC
11 3.3V Orange +3.3 VDC
12 -12V Blue -12 VDC
13 COM Black Ground
14 /PS_ON Green Power Supply On (active low). Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF.
15 COM Black Ground
16 COM Black Ground
17 COM Black Ground
18 -5V White -5 VDC
19 5V Red +5 VDC
20 5V Red +5 VDC

/PSON activated by pressing and releasing the power button while the power supply is in standby mode. Activating /PSON connects the power supply's /PSON input to ground, thereby switching the power supply to full-on condition.
18 AWG is recommended for all wires except pin 11, which should be 22 AWG. For 300W configurations 16 AWG is recommended.
There are several ATX variants.
Hope this helps.
If this helps you resolve your problem, please
consider giving me a rating of 4.It will help me as well. Thank you.

Nov 26, 2010 | Compaq (243890-001) 250-Watt Power Supply

1 Answer

I am trying to troubleshoot whether or not my ultra x2 connect 550 watt power supply is bad. When you press the power button on the computer, the light flashes and then noth9ing else happens. The light...


Well here is a way to check your power supply, on your hard drive connector using your volt meter and measuring from ground. this would be using one of two middle connectors it should measure +5 VDC on the red wire and + 12 VDC on the yellow wire. If these voltages are good then we got to see if the power supply is producing the -12VDC voltage. This voltage is ussed by the syustemboard on pin 14 of a 24 pin power supply. I would recommend not having your system board plugged in while measuring these votlages, but the power supply may need a load, I would plug in the cdrom.. Below are a couple of picture to explain this and a link to a website that has this documented.

http://www.playtool.com/pages/psuconnectors/connectors.html

dfish26_1.jpg The 24 pin main power connector was added in ATX12V 2.0 to provide extra power needed by PCI Express slots. The older 20 pin main power cable only has one 12 volt line. The new 24 pin connector added one line apiece for ground, 3.3, 5, and 12 volts. The extra pins made the auxiliary power cable unnecessary so most ATX12V 2.x power supplies don't have them. The 24 pin connector is polarized so it can only be plugged in pointing in the correct direction.
Pinout Pins 1 through 12 Pins 13 through 24 Description Wire color Pin number Pin number Wire color Description +3.3 volts orange 1 13 orange +3.3 volts +3.3 volts orange 2 14 blue -12 volts ground black 3 15 black ground +5 volts red 4 16 green PS_ON# ground black 5 17 black ground +5 volts red 6 18 black ground ground black 7 19 black ground PWR_OK gray 8 20 white -5 volts (optional) VSB +5 volts purple 9 21 red +5 volts +12 volts yellow 10 22 red +5 volts +12 volts yellow 11 23 red +5 volts +3.3 volts orange 12 24 black ground
Good Luck I hope this helps.

Nov 19, 2010 | PSA Ultra X2 Connect (ULT31851) 550-Watt...

1 Answer

What is voltage pin layout for the connectors on power supply model dr-b300atx


I assume you are talking of the 20 or 24 pin connector plugging into the Motherboard. Is it 20 or 24? Is there a 4 pin +12v connector plug. The colors of the wires tell a story. Red is +5V Black is Ground or Return. There is Yellow and Orange and Blue and green and gray. There are SATA connections . Look in your users manual of a standard Motherboard. This will give you a pinout and voltages on these pins. Write down the voltage starting with pin 1 and add the color to simplify knowing the voltages. If you're tech savvy, break out a multimeter for absolute certainty.

Mar 26, 2010 | Austin System Power Supplies

1 Answer

Do not start


First remove smps power suply unit box from cpu.
Then ground pin and check is it on you have to ground 4-5 pin blck and green.
Then if it is on then smps is ok.then pull cmos cell from motherbord for 10 minutes make sure cmos cell give voltage.Remove pci cards from pci slot is any.
connect ATX power supply to motherbord then check.
But if smps is not turn on then it has some issue.
Change fuse of smps if still not on then you have repair it or change.
Let me know if you need further assistance.
Thanks.

Oct 26, 2009 | Gateway Emachine Bestec ATX-250-12E PS...

1 Answer

PS works only when i short wire green & black on 20 pin ATX .


Sounds like it's not grounding properly. Safest thing to do would be to replace the power supply. Hope this helps.

Dec 27, 2008 | Global Marketing Partners MICRO ATX 270W...

1 Answer

No Power


Dear Sir,

I assume, you have voltmeter with you.
Set VOM to DC 20 V range.
Remove the Power Supply from cabinet. Be sure you have proper earth in your house/workshop.
On the 20/24 pin main connector of your power supply, short the pins carrying green & black wire.
Hook your voltmeter -ve on any black pin of the connector permenantly.
& then connect the mains power cord to your power supply.
If your power supply is ok, this shall start the fans of the power supply on & running. Now you can check the voltages on different pins. There is a sticker on your power supply showing the normal voltages on every wire.
If you don't see any / normal volatges, your power supply needs repairing. You can buy a new one/ repair existing.

Jun 17, 2008 | Silverstone SST-ST405 (SSTST405) 400-Watt...

1 Answer

Power supply


ATX Version 1.2 - 20 wire motherboard connector Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Pin 9 Pin 10 3.3V 3.3V Gnd 5V Gnd 5V Gnd P_OK 5VSB 12V Oran Oran Blk Red Blk Red Blk Gray Purp Yell Oran Blue Blk Green Blk Blk Blk White Red Red 3.3V -12V Gnd P_ON Gnd Gnd Gnd -5V 5V 5V Pin 11 Pin 12 Pin 13 Pin 14 Pin 15 Pin 16 Pin 17 Pin 18 Pin 19 Pin 20 The color scheme used for the voltages in the 20 pin connector holds for the other ATX standard power supply connectors. However, brand name manufacturers often build proprietary power supplies or make up their own color coding, so I wouldn't throw out a power supply that supplies 5V where you think it should supply 3.3V. It's more likely a proprietary design than a failure.

Feb 21, 2008 | System Power Supplies

3 Answers

Computer doesn't switch on!


More than likely nothing to do with the motherboard.

I have the Thermaltake w0049. and for the money paid is poor quality.
This model and I would guess other models by Thermaltake go belly up if subjected to voltage spikes ie lightening strikes (they are not well protected)
Remove all the leads to your motherboard and join together the single green wire (power select) to any one of the adjacent black leads (ground).
Any atx supply, if connected to mains voltage will not operate at all unless if has some form of load on it. if you do the shunt as suggested(use a paper clip) the fans should spin and you should be able to measure the voltages between ground and the relevant pins.
If you can, plug in a hdd to one of the plugs to give it some kind of load. if you do not know which voltage pins are which on your 20/24 pin connector , then search google for "atx pinout"

Dec 21, 2007 | System Power Supplies

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