Question about Global Marketing Partners MICRO ATX 270W PSU FSP270-50SNV 6CM FAN (OEM) BY FSP GROUP (9PA2700109) Power Supply

1 Answer

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

With the power supply normaly connected it does not work on any computer. However when tested with 20 pin ATX connector green & black wire shorted. All the voltages are present i.e. +- 5V & 20V.

what could be the problem ?

Power supply model # FSP270-50SNV.

Thanks,

Sam

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

Posted on Dec 27, 2008

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3 Answers

How to make a pc power unit work without a motherboard?


There are two pins on the atx connector you need to bridge. You can wire a switch to the pins too if you want so you can toggle on and off. Otherwise, there is a guy on eBay (seller id: antronst) that sells a connector with the pins already bridged with a on/off switch and a resistor wired in to provide some stability for five or six dollars.
Here is a diagram. Make sure it is a standard atx power supply. Some old Dells had goofy wiring.
http://www.techpowerup.com/articles/other/22

May 16, 2014 | Intel Acbel Power Supply Supports ATX 12V...

2 Answers

No power when I switch on computer. Fan not running, power light not coming on. Have tried plugging in to different socket. Still nothing. Taken case side off, double checked all fittings. Cleaned computer...


If you know the receptacles that you have plugged the computer into, indeed have power, I would suggest you diagnose the Power On switch, and the Power Supply.

See of the problem is the Power On switch, or the Power Supply.

A jumper wire is used on the main ATX power cable.

1) If the Power Supply comes on you have a bad Power On switch.
2) If the Power Supply does Not come on, you have a bad Power Supply.

Your problem is posted in the eMachines Bestec ATX-300-12E power supply section.
Going with that we are discussing a Bestec ATX 300 watt power supply, the main ATX power cable is a 20-pin ATX main power cable.

Typical pinout of a 20-pin ATX main power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

Note the Green wire in the BACK of the connector, in the photo to the far right.
This is the Soft Power On wire, or also abbreviated as the PS_ON wire.

Note the Black wires. ANY Black wire is a Ground wire.

With the 20-pin ATX power cable plugged into the motherboard, as shown in the photo, a jumper wire is touched to the Green wire, and to ANY Black wire.
The computer (Power Supply) is also plugged into power.

Generally a paper clip is used for the jumper wire.
The paper clip is straightened out, then bent into a U shape.
Black plastic electrical tape is then wound around the middle of the U shape.
This taped area is for your fingers, and thumb to hold onto.

The 'legs' of the paper clip, are then inserted down into the socket holes, in the back of the 20-pin ATX main power cable's connector.

Down into a socket hole with the Green wire, and also into a socket hole with ANY Black wire.
The 'leg' of the paper clip goes down into the socket hole, RIGHT NEXT to the existing wire.

At the end of every wire in the 20-pin ATX main power cable, is a metal terminal end.
The metal terminal end is pretty far down in the socket.
You must ensure that the metal end of the paper clip, touches the metal terminal.

The voltage is 5 Volts DC.
Two D cell flashlight batteries produce 3 Volts DC.
There may be a small spark as you make the connection.

Warning you in advance.
You can see the voltage is VERY low, however.

I would like you to perform this test, then post back in a Comment as to your findings.

Regards,
joecoolvette

Apr 03, 2011 | E-Machines Bestec ATX-300-12E Rev. D 300w...

1 Answer

Ref ASTEC power supply from old computer model SA 147-3505 I can pick up the logic 5 volts but not the +12 volts and -12 volts .FAN not energised so I guess there needs to be an elec link via the computer...


You can jumper on an ATX power supply by using a wire to connect pin 4 (green wire) to any of the grounds on the 20 pin ATX connector. The grounds are normally a black wire. You will need to put some sort of load on the power supply such as a hard drive to keep it running.

Feb 25, 2011 | Dell PWR,SUPPLY,145 WATTS,ASTEC SA150-3411...

1 Answer

My dell dccy will not power on. It was working fine and was powered off but will not power back on. I have checked the power cord. I have opened the case and reseated all connectors. Pushing the power on...


Yes, it's called bypassing the Power On switch. Has nothing to do with the switch itself, or it's wires.

You use a jumper wire on the 20 or 24-pin ATX main power cable's connector.
Touch the jumper wire from the Green wire (Soft Power On) to ANY Black wire. (Ground)
(Soft Power On is abbreviated as PS_ON)

If the Power Supply comes on, the problem is the Power On switch.
If the Power Supply does Not come on, the problem is the Power Supply.

1) 20-pin ATX main power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

2) 24-pin ATX main power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24

Look at the photos of the ATX main power cable plugged into the motherboard.
Where the wires go down into the connector is the Back of the connector.

This is where the jumper wire goes down into.

The jumper wire goes down into the socket hole, in the Back of the connector, RIGHT NEXT to the wire IN the socket hole.
The jumper wire has to go pretty far down in the socket hole.

[ATX power cable plugged into the motherboard, Power Supply plugged into power ]

At the end of every wire in the ATX main power cable's connector, is a metal terminal.

A Female Molex Crimp Terminal connector,

http://www.alibaba.com/product-gs/336134982/molex_female_crimp_terminal_connector/showimage.html

[You can click on the Zoom In icon { + } at the top to enlarge the view]

The jumper wire Must touch that metal terminal.
The jumper wire is made from a straightened out paper clip, bent into a U shape.
The middle of the U is wrapped a few times with Black plastic electrical tape.
This where your fingers hold onto the jumper wire.

(One wrap of Black plastic electrical tape is good for 600 Volts DC)

One 'leg' of the U shaped jumper wire goes down into the socket hole with a Green wire.
The other 'leg' of the U shaped jumper wire goes down into ANY socket hole with a Black wire.
(ALL Black wires are Ground wires)

The contact period made is no longer than 2 seconds.

The Voltage is 5 Volts DC.
Two flashlight batteries produce 3 Volts DC.

This is one generic ATX power on switch that I have found fits many computers,

http://www.directron.com/atxswitch.html

NOTE*

WATCH IT when buying an aftermarket Power Supply for your computer, if it needs one.
For a time period Dell was strictly a Proprietary computer manufacturer.
Dell wanted THEIR parts used in THEIR computers only.

They had the motherboard manufacturer switch the pins around in the ATX main power cable connector, on the motherboard.
They also had the Power Supply manufacturer switch the power cables around in the Power Supply.

This means if you plug an ATX main power cable, from an aftermarket Power Supply, into one of these proprietary Dell motherboards, you WILL fry out the motherboard!

Can also fry out the Processor, Ram Memory, and Harddrive. (Plus a graphics card if you have one installed)

CHECK the color code of the aftermarket Power Supply's ATX main power cable, to the color code of the Dell power supply.

See that the color code of the wires matches the socket holes in the connector.

Have further questions regarding this, post in a Comment.

Regards,
joecoolvette

Nov 29, 2010 | Dell System Power Supplies

1 Answer

I have a desktop. when i turn it on nothing happens.


Test whether the problem is the Power On switch, or the Power Supply.

The Power On switch is located inside the plastic Power On button. It's removable in most cases.
This is a typical ATX power on switch,

http://www.directron.com/atxswitch.html

To test you will bypass the Power On switch.

If the Power Supply comes on, you have a bad Power On switch.
If the Power Supply does Not come on, you have a bad Power Supply.

The test doesn't involve the Power On switch, or it's wires.

It involves the 20 or 24-pin ATX main power cable, the Soft Power On wire, (Green), and ANY Ground wire.
(Black)
A jumper wire is used from the Green wire to ANY Black wire.

Computer unplugged from power, observe Anti-Static Precautions, BEFORE you reach inside.

Anti-Static Precautions:
Your body carries Static electricity.
Static will fry out (Short Circuit) the hardware components inside a computer.
Computer unplugged from power, TOUCH the metal frame of the open computer case. Touch an unpainted surface.

This action will relieve your body of Static.
Should you leave your computer in the middle of working on it, be SURE to Touch the metal frame again upon your return.

You may have to ease a few cables over to view the motherboard.
You are looking for the 20, or 24-pin ATX main power cable.
(Don't know if your model uses a 20-pin, or a 24-pin.
This is what you're looking for,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

Scroll down to see the 24-pin ATX main power cable.
Look at the photo to the far right.
The Green wire is the Soft Power On wire.
ANY Black wire is a Ground wire.

With the ATX power cable plugged into the motherboard, as shown in the photo to the far right, you are going to insert a jumper wire down into the socket holes.

The jumper wire goes down in the socket hole, Right next to the wire that is in the hole.
It goes down in far enough to touch a metal terminal, that is at the end of the wire.
(Approximately 1/2 inch)

The jumper wire of choice is a paper clip straightened out, then bent into a U-shape.
The middle of the U is wrapped a few times with black plastic electrical tape.
(Trivia: One wrap of black plastic electrical tape is enough for 600 Volts DC)

The voltage you will be dealing with is 5 Volts DC.
Two D cell flashlight batteries produce 3 Volts DC.

You may wish to wear a glove on the hand that holds the jumper wire. There may be a small spark.
The Power Supply, (Computer), is plugged into power.

One end of the U-shaped jumper wire, is inserted down into the socket hole with a Green wire. (Right next to the wire)
The other end is inserted down into a socket hole with ANY Black wire.
The contact made is no more than 2 seconds. (1001, 1002)

If the computer comes on, (Power Supply actually), the Power On switch is bad.
If the computer does not come on (Power Supply), the Power Supply is bad.








Oct 20, 2010 | Acer (56.04145.901) (5604145901) Power...

1 Answer

How can i use this power supply in a stand alone situation to DC cooling fans only? if i just plug it in i get no output voltage.


look at the ATX connector.
http://www.smps.us/atx-connector-20-24pin.jpeg
Now you need to connect pins 15 and 16. They are normally Green and Black. All you are doing is connecting the signal the PSU looks to turn on into a ground.

So the best way and cheapest way it to bend a paperclip and put one end in the green wire and another in the black one.

I use this trick almost every time I am fixing computers. It specially awesome when you want to run a water cooling system without turning on the computer.

Apr 24, 2010 | Dell (PS-5251-2DS) (M0148) 250-Watt Power...

1 Answer

HP-233Snf


Anytime you see a Green wire in a computer, (Personal Computer), power supply's ->power cable, it is for the Soft Power On function.
This way there isn't a cable, (Cord), going from the Power On switch to the power supply.
These are ATX style of power supply's.

The Black insulated wires are Ground wires. ALL of them.

There was a older power supply made, and this was the AT style.

To provide a solution, I'm going to give you some information on the power cables, for Both of these styles of power supply's, then some advice.

1.This is info, and photos of the older AT power supply's power cables,
http://www.playtool.com/pages/psuconnectors/connectors.html#oldpc

2.This is the newer ATX style power cable, and more specifically the 20-pin version,
http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20
Scroll down the page to view the 24-pin power cable, and then scroll down some more, to view the 20+4-pin power cable.

ALL ATX design power supply's use Pin 16 for PS ON, (Soft Power On), which is a Green wire, and ANY Black wire. ALL Black wires are a ground. Pin 15 has a Black wire, and is normally used to put a jumper in, from it to Pin 15. This turns the power supply on. There will be a small spark, and the chance of getting shocked.

What you are doing essentially, is using a personal computer power supply as a laboratory power source, therefore I cannot advise you further, as it is a Safety Hazard.

Jul 31, 2009 | Dell POWER SUPPLY PS-5201-5D (PS52015D)...

1 Answer

POWER SUPPLY


ATX PSU are enabled by a signal on the green wire pin 16.

Shorting of pin 16 to ground (0VDC) will enable the PSU
Refer HERE

Also refer HERE for the 20 PIN ATX

Jul 01, 2008 | Intel (ATX350P4) 350-Watt Power Supply

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...

3 Answers

Compaq power supply HP212 (old)


If connector have two big brown wires (pins 1 and 11) and a small brown wire (pin 2). then short circuit the small brown wire with a big brown wire (pins 1 and 2).
Also short circuit the small black wire (pin 16) with a big black wire (pin 17).
Ps. The Power Supply needs a minimal load ex: 1A.

Dec 04, 2007 | Dell HP-150SS (HP150SS) 150-Watt Power...

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