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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How do i turn on a compaq ps-7231 power supply?


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 (+5 VDC when power is Ok) 9 5VSB Purple +5 VDC Standby Voltage (max 10mA, max 2A in ATX 2.2 spec) 10 12V Yellow +12 VDC 11 12V Yellow +12 VDC 12 3.3V Orange +3.3 VDC 13 3.3V Orange +3.3 VDC. ATX V2.3 / EPS12V V2.92 both define that the PSU has to use remote sensing to compensate cable drops on the 3.3V line. Because of this there is an additional brown cable crimped together with the orange cable either to pin 13 (ATX) or pin 1 (EPS12V). 14 -12V Blue -12 VDC 15 COM Black Ground 16 /PS_ON Green Power Supply On (active low). Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF. 17 COM Black Ground 18 COM Black Ground 19 COM Black Ground 20 -5V White -5 VDC (this is optional on newer ATX-2 supplies, it is for use with older AT class expansion cards and can be omitted on newer units) 21 +5V Red +5 VDC 22 +5V Red +5 VDC 23 +5V Red +5 VDC 24 COM Black Ground /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.

Feb 26, 2015 | Compaq Computers & Internet

1 Answer

My computer will not turn on and i was told something is wrong with the motherboard. How do i fix this?


Your computer, Dell Dimension E521 Desktop PC, will not turn on, and someone told you the problem is the motherboard?

Unless you stated to this entity, that you spotted leaking Electrolytic Capacitors on the motherboard, how can they assume this?

I believe you should check whether the problem is the Power On switch, or the Power Supply.

1) The Power On switch is located inside the plastic Power On button. It is an ATX power on switch. (The Power On switch is a Momentary Contact Switch )

This is an example of an ATX power on switch, that I have found fits many desktop computers,

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

The test to perform bypasses the Power On switch. It does NOT involve the Power On switch itself, however.

Bypassing the Power On switch turns the computer (Power Supply) on?
Problem is the Power On switch.

Bypassing the Power On switch does NOT turn the computer (Power Supply) on?
The problem is the Power Supply.

A) Computer on a table, computer unplugged from power, computer case open.
I would then lay the computer on it's side, on a towel, on the table, computer case opening UP.
Watch the cables attached to the computer.

This is so you can access the components inside of the computer more easily. This will become apparent in a moment.
Now follow Anti-Static Precautions.

Anti-Static Precautions:
Your body carries Static electricity. Static WILL fry out (Short Circuit) the delicate hardware components inside a computer.
Relieve your body of Static BEFORE reaching inside the computer.

(Have to restate) Computer on a table, computer unplugged from power, computer case open.
TOUCH an unpainted surface, of the metal frame of the open computer case.
This action will relieve your body of Static.

Should you leave your computer in the middle of working on it, (For ANY reason), be SURE to touch the metal frame again upon your return.

Now you are safe, and the computer is safe. Let's begin;

Inside your computer there is a power cable coming from the Power Supply, that plugs into the motherboard. This power cable I'm referring to is the 24-pin ATX main power cable.

This is an example of a 24-pin ATX main power cable, and it's respective connector on the motherboard,

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

Female connector on motherboard shown in the Left photo.
Power cable connector shown in the middle photo.

The photo to the right shows the ATX main power cable plugged into the motherboard.
This is how it needs to be for the test. It also shows the color of the various wires going into it.
We only need to be concerned with Two wires.

The Green wire, and ANY Black wire.

The Green wire is the Soft Power On wire. It is also abbreviated as PS_ON.
ANY Black wire you see is a Ground wire.

A jumper wire is used to BRIEFLY connect the Green wire, to ANY Black wire.
(Again, the Power On switch is a Momentary Contact Switch)

The jumper wire preferred to use is a paper clip. The paper clip is straightened out, then bent into a U-shape.
Look at the U-shape upside down. The top/middle is wrapped a few times with black plastic electrical tape. This is for your fingers, and thumb to hold onto.

The 'legs' of the U-shape go down into the Back of the ATX main power cable's connector.
(I shortened 24-pin ATX main power cable to ATX main power cable)

Look at the photo to the right. See how the Green wire goes down into a squarish socket hole?
Look at the photo in the middle. See the metal tube shapes at the Front of the connector?
Brass looking, slightly square?

These are metal terminals. There is a metal terminal for every wire, going down into the ATX main power cable connector.

The 'leg' of the U-shape jumper wire goes down into the Back of the connector (ATX main power cable connector), RIGHT NEXT TO the existing wire that is in the socket hole.

It has to go down into the squarish socket hole far enough, to pass by the insulation of the wire, and Touch the metal terminal.

Example:
One leg of the U-shape goes down into the socket hole of the Green wire, right next to the Green wire, and touches the metal terminal.

The other leg of the U-shape goes down into a socket hole, with ANY Black wire, and touches the metal terminal pin.

The leg MUST touch the metal terminal pin.

The contact made is brief. No more than 2 seconds. (1001,..1002)

Shock warning. None.
The Soft Power On wire (Green wire) has 5 Volts DC going through it.
In comparison two D cell flashlight batteries produce 3 Volts DC.

HOWEVER, there may be a spark, as both legs of the U-shape jumper wire touch their respective metal terminals. Warning you in advance.

You are also holding onto the black plastic electrical tape. (One wrap of black plastic electrical tape will insulate you from 600 Volts DC)

IF, the jumper wire turns the computer on, (Power Supply actually), the problem is a bad Power On switch.

IF, the jumper wire does Not turn the computer on, the problem is a bad Power Supply.

The Power Supply used in a Dell Dimension E521 Desktop PC, is an ATX (Form Factor) power supply.

The form factor ATX for a Power Supply refers to the size, and shape of the Power Supply's case, and the power cables provided with the Power Supply.

The size, and shape of the ATX power supply case is approximately 6 inches Wide (Width), 5-1/2 inches Long (Length), and 3-1/2 inches Tall. (Height)

With the power cables offered with today's offering of ATX power supply's, there is no need to be concerned if the ATX power supply in question, has the needed power cables.

ATX power supply's sold now, have the correct power cables you'll need, and the correct amount of power cables.

This is just one example of an ATX power supply that will work,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1389575&CatId=1078

Scroll down to the bold heading - Detailed Features
Look at the chart under the subheading - Connectors

Note the first connector shown. This is a 20-pin plus a 4-pin main power cable.
Both power cables are used for your 24-pin ATX main power cable connector, on your motherboard.

This gives a little more information on a 20 + 4-pin ATX main power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20plus4

Note the photo to the right. This particular motherboard has a 20-pin ATX main power cable connector. It does not require the additional 4-pin power cable.
Yours does.

Do Not confuse the 4-pin ATX +12 Volt power cable, with the 4-pin power cable that comes with a 20 + 4-pin ATX main power cable.

The 4-pin power cable you need is in the harness of wires, for the 20 + 4-pin ATX main power cable.

There WILL be a 4-pin ATX +12 Volt power cable, however. This is an example of a 4-pin ATX +12 Volt power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

(Color of the connectors for any power cable, does Not matter. They can be any color)

Dell Support > Dimension E521 Desktop PC > Service Manual,

http://support.dell.com/support/edocs/systems/dime521/en/SM_EN/index.htm

In the list click on - Technical Overview
Now click on - System Board Components

22 is where the 24-pin ATX main power cable plugs in.

(NOTE*
The 24-pin ATX main power cable connector, and the 4-pin ATX +12 Volt power cable connector, have a Lock on the side. The plastic rectangle on the side of the connector/s.
This Lock has a hook on the bottom end. The end that faces the motherboard.
The hook goes over a Tab on the female connector, on the motherboard.

The Lock acts like a see-saw on a playground. The top of the Lock is squeezed in. This action brings the hooked end away, from the Tab on the motherboard female connector.
Then the power cable CONNECTOR is wiggled, and removed from the female motherboard connector.

{ ONLY use the Connector when removing it. DO NOT pull on the wires)

2 points to where the 4-pin ATX +12 Volt power cable plugs in.
That's it for the Power Supply power cables.

1 points to where the Processor Fan plugs into.
5 and 6, point to where the Data cables from the SATA harddrive, and SATA optical drives, plug into.
(This is if the Dimension E521 has SATA optical drives, and not IDE { PATA} optical drives)

[ The SATA data cable connector has 7 contact pins in it. It is the shorter connector.
The SATA power cable has 15 pins in it. It is the longer connector.

IF, the SATA harddrive has a provision for using a SATA power cable, AND a 4-pin Peripheral power cable (Mislabeled as Molex), ONLY use just the SATA power cable. Otherwise the SATA harddrive will burn out. Sometimes not right away, but eventually it does ]

Going back to the main page for the Service Manual, click on -
Removing and Installing Parts.

Removing the Computer Cover is listed, as well as Power Supply.

For additional questions please post in a Comment.

Regards,
joecoolvette

Nov 03, 2011 | Dell Dimension E521 PC Desktop

1 Answer

What pins are the switch to turn on power supply continuously


Pins 16 and 17 for a 24-pin ATX main power cable connector, and Pins 14 and 15 for a 20-pin ATX main power cable connector.

1) 24-pin ATX main power cable and it's respective connector,

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


2) 20-pin ATX main power cable and it's respective connector,

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

Just remember; The Green wire is the Soft Power On wire, (PS_ON)

ANY Black wire is a Ground wire.

A jumper wire is used briefly to touch the green wire to ANY black wire.

The preferred jumper wire is a paper clip because of it's size. (Diameter)

The jumper wire goes down into the BACK of the connector, RIGHT NEXT TO THE EXISTING WIRE that is already in there.

The BACK of the connector is where the wires go in. (In the links above look at the photo to the far right)

The 24-pin, or 20-pin ATX main power cable, is plugged into the motherboard.
The Power Supply is plugged into power.

The jumper wire goes down into the socket hole, right next to the existing wire, and far down in the socket hole.
It has to touch a metal terminal that is in the FRONT of the connector.
Each wire going into that connector has a metal terminal at the end of it.

Black plastic electrical tape is wound around the middle of the U shaped paper clip.

Use the jumper wire and the Power Supply comes on?
You have a bad Power On switch.

Power Supply does Not come on?
You have a bad Power Supply

Sep 17, 2011 | Computers & Internet

1 Answer

My intel d865gsa mother doesn't get on when i press powerbutton. When i press powerbutton, the green lights gets on as long as i press powerbuttom, cpu fan rotates at low speed but when i short the...


Go to to eBay and search for "Computer 20 / 24 Pin PSU ATX SATA HDD PC Power Supply Tester". costs less than $10 USD, It will verify the PS unit is good, then you can determine if there is a problem with the motherboard. Bad PS is most likely the source of start problems for PC motherboards.

Aug 22, 2011 | Intel D865GVHZ Motherboard

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

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

My computer won't turn on. Everything's dead.


1) Check to make sure your surge protector has power. Power On LED light is lit.

2) Check THE receptacle, in the surge protector that the computer is plugged into.
I have had a few bad surge protectors where just THAT receptacle was bad.
"Hmmm, surge protector Power On LED light is lit.
Monitor, printer, and router plugged into the surge protector have power."

Plugged a table lamp into THAT receptacle in the surge protector, that the computer was plugged into, found it to be bad.

3) Perform the test to check whether it is a bad Power On switch, or a bad Power Supply.

The Power On switch is located inside the plastic Power On button.
This is a generic Power On switch (ATX), that I have found fits many computers,

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

The test involves bypassing the Power On switch. Has nothing to do with the Power On switch wires.
A jumper wire is used on your 20, or 24-pin ATX main power cable's connector.

The jumper wire goes from the Soft Power On wire, (Also referred to as PS_ON. It is a Green wire), to ANY Black wire in the main power cable's connector.

Since you didn't post what computer you have, (Computer manufacturer, and Model Number), I have to give you generic information.
It may also be, that there is no direct information available for the computer you have.

1) This is a 20-pin ATX main power cable, and it's connector,

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

2 This is a 24-pin ATX main power cable, and it's connector,

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

[Older computers use the 20-pin ATX main power cable. Later computers needed more power to the motherboard, hence 4 more power wires were added. 24-pin ATX main power cable ]

Computer unplugged from power, observe Anti-Static Precautions.

[ Anti-Static Precautions:
Your body carries Static electricity.
Static will fry out (Short Circuit) the hardware components inside a computer.

Computer on a table, computer unplugged from power, computer case open; TOUCH the metal frame of the open computer case.
This will relieve your body of Static.

While working on your computer your hands, and forearms should occasionally touch the metal frame.
But if you leave your computer in the middle of working on it, be SURE to Touch the metal frame again upon your return ]

If you bypass the Power On switch, and the computer comes on, (Power Supply comes on), you have a bad Power On switch.

If you bypass the Power On switch, and the computer Does Not come on, (Power Supply), you have a bad Power Supply.

The test is to use a jumper wire on the 20, or 24-pin ATX main power cable's connector.
The jumper wire connects from the Soft Power On wire, (Green), to ANY Ground wire. (ALL Black wires are Ground wires)

The 20, or 24-pin ATX main power cable is plugged into the motherboard.
The Power Supply, (Computer), is plugged into power.

Use one end of a jumper wire, to go down into the socket hole with a Green wire, and the other end of the jumper wire to go down into a socket hole, with ANY Black wire.

The jumper wire must go down into the socket hole pretty far.
The jumper wire goes down into the socket hole, right next to the wire that is already in the socket hole.

The jumper wire has to go down in the socket hole far enough, to touch a metal terminal that is on the end of the wire.
I realize that this may look complicated on 'paper', but I'm just being very detailed.

Most use a jumper wire made from a paper clip. The paper clip's diameter is thin enough to slide down into the socket hole, right next to the wire that is already in the socket hole. (And touch the metal terminal at the bottom of the wire)

The paper clip is straightened out, then bent into a U-shape.
Black plastic electrical tape is wound around the middle of the U-shape.
The taped part is what you hold onto.

The voltage for the Soft Power On wire, (Green) is 5 Volts DC.
Two D cell flashlight batteries produce 3 Volts DC.
Just in case you have reservations.

There may be a spark. Warning you in advance.
You may wish to use a glove, on the hand that holds the jumper wire.
Just make a brief contact with the jumper wire. No more than 2 seconds should suffice.

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.
No if's, and's, or but's about it.


Tell me the computer manufacturer name, and model number, and we'll see if a compatible Power Supply can be found.
Post in a Comment.

Oct 06, 2010 | Computers & Internet

2 Answers

My pc will not turn on at all


1) Check The receptacle in the surge protector, that the computer is plugged into.
I have had surge protectors where just THAT receptacle was bad.

"Hmmm, surge protector power on light is lit. Monitor, printer, and router, plugged into the surge protector, has power."

Upon plugging in a table lamp into THAT receptacle on the surge protector, I found THAT receptacle to be bad.
($30+ surge protectors, too!)

2) If the surge protector proves to be good, I would suggest performing a test that checks whether the Power On switch is bad, or the Power Supply, in the computer.

To expound:
Behind that plastic Power On button, is a Power On switch.
I have found this generic Power On switch fits many computers.

Just an example, to show you what a typical Power on switch looks like,

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

The test involves using a jumper wire to bypass the Power on switch, to see if the problem is the Power On switch, or the Power Supply.

Using the jumper wire turns the computer on, (Power Supply on), the problem is the Power On switch.

Using the jumper wire does Not turn the computer on, (Power Supply), the problem is the Power Supply.

This is HP Support, and the main page for the HP Pavilion a705W desktop computer,

http://h10025.www1.hp.com/ewfrf/wc/product?product=435558&lc=en&cc=us&dlc=en&submit.y=4&submit.x=5&lang=en&cc=us

Go to the right side, and click on Product Information.

Now click on Product specifications, and then on -
Motherboard Specifications, MS-6577 (Giovani, Giovani2)
(Close the web survey. It's something that can be done without, IMHO)

Scroll to the bottom of the page, and view the motherboard photo, and the motherboard illustration.

Refer to the motherboard illustration
Look to the top right for - CONN1

Now refer to the motherboard photo, and match up CONN1.
It is a white connector on the motherboard. Has 2 rows of 10 socket holes.

The correct name for this connector on the motherboard, is a 20-pin ATX main power cable connector.

This is more information on a 20-pin ATX main power cable, it's respective connector, and the matching connector on the motherboard,

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

With the side panel removed on your computer, (Computer Unplugged from power), you will see your 20-pin ATX main power cable, plugged into this connector on the motherboard.

Will resemble the photo to the far right.

[ NOTE*
Before reaching into a computer, have the power to the computer Unplugged.
Also follow Anti-Static Precautions.

Anti-Static Precautions:
Your body carries Static electricity.
Static will fry out (Short Circuit) the delicate hardware components inside a computer.

Relieve your body of Static BEFORE handling any computer parts, (hardware components), that you are going to install, and BEFORE you reach inside your computer.

Computer unplugged from power, computer case open, work on a table. TOUCH the metal frame of the open computer case, to relieve your body of Static electricity.

Should you get up, and walk away in the middle of working on your computer, upon your return be SURE to Touch the metal frame again.

Best method is to use an ESD wrist strap, (About $6), and connect the alligator clip to the metal frame.
Electro Static Discharge ]

Observing the photo to the far right, the procedure is to use a jumper wire from the Green wire, to ANY Black wire.

The main power cable is plugged in as shown.
One end of the jumper wire goes down into the socket hole with the Green wire, and the other end goes down into a socket hole with ANY Black wire.

[ The Green wire is the Soft Power on wire. Abbreviated as PS-ON.
ANY Black wire is a Ground wire.
You are making a circuit with the jumper wire, from the Soft Power on wire, to ANY Ground wire ]

The wires that go down into the main power cable's connector, have plastic insulation on them.
At the end of Each wire is a metal terminal connector.

(They resemble this metal terminal connector,

http://www.mcmelectronics.com/product/28-9410&green=13639529671&utm_campaign=MyBuys&utm_medium=Recommendation&utm_source=prod&utm_term=28-9410

The metal terminal pin is pretty far down in the socket hole.

For this reason, you have to ensure that the jumper wire is going down in the socket hole, (Right next to the wire that is already in the socket hole), and goes down in far enough to touch that metal terminal connector.

I usually state using an insulated wire, but am now going to concede, and advise what many state to use for a jumper wire.

A paper clip.

The paper clip is straightened out, then bent into a U shape.
The center of the U is wrapped with electrical tape.

The taped part of the paper clip 'jumper wire', is then held with your fingers, and thumb.

You may also wish to don a glove, on the hand that holds the jumper wire.
There will be a spark.

The voltage is 5 Volts DC.
Two D cell batteries used in a flashlight produce 3 Volts DC.

I would lay the computer on it's side, opening up.
Easier to access the 20-pin ATX main power cable's connector.
(Won't hurt a computer to lay on it's side, and be powered up)

Computer plugged into power, insert one end of the U shaped paper clip into the socket hole with the Green wire.
Now bend the paper clip if necessary, and insert the other end into ANY socket hole with a Black wire.

Make SURE the paper clip is touching the metal terminal connectors, down in the two socket holes.

Computer comes on?
Bad Power on switch.

Computer does Not come on?
Bad Power Supply.

The Power Supply used is just an ordinary ATX style of Power Supply.
Common in over 80 percent of PC's out there, and readily available.

The Wattage is 300 Watts.

The shape, and size of the Power Supply's case is approximately,
A) 6 inches Long
B) 6 inches Wide
C) 3-1/2 inches Tall

Make sure it has a 4-pin ATX +12 Volt power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

(Also abbreviated as P4 ATX 12VX1)

Newer Power Supply's have an ATX main power cable, that it's connector can be used as a 20-pin ATX main power cable, (Which you need), or a 24-pin ATX main power cable.

This is one example of a Power Supply that will work in your computer, and is reliable, while economical,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1389575&CatId=1078

Aug 22, 2010 | HP Pavilion a705w PC Desktop

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)...

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