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I'm trying to trouble shoot a PC power supply. I want to know which pins to jumper (short) on the EPS12V cable connector (4 pin, 2 yellow, 2 black) to turn the power supply on (on the bench).

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Hello sir, hi, ITS NOT THE 4PIN You will jumper short to test the power supply, bu the green one to be shorted to the black one. They are located on the 20/24pin power connector.

Posted on Nov 19, 2009

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2 WIRES FOR 12V SUPPLY. PIN NOs 2 WIRES for Signal PIN Nos. ??


How PC Fans Work - PCB Heaven

pcbheaven.com/wikipages/How_PC_Fans_Work/
Mar 29, 2010 - The connector of a 2-wire fan has a red and a black cable. ... The firsttwo wires are the power supply of the fan. ... This fan is designed to be controlled with a PWM signal and .... I have a four-wire (red black yellow blue) 12v fan out of an old .... My case has a number of 2 pin outputs for multiple case fans, ...

Motherboard Power Connectors ' PC Repair and ... - InformIT

www.informit.com > Articles > Hardware

InformITFeb 28, 2003 - Table 3.3 ATX Main Power Supply Connector Pinout (Wire Side View) .... The auxiliary connector has no +12v leads at all, so that is no help. Pulling up to ...Pin. Signal. Color. Yellow. +12V. 3. 1. Gnd. Black. Yellow. +12V. 4. 2.

ATX 24 pin power supply connector pinout diagram ...

pinouts.ru/Power/atx_v2_pinout.shtml

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Jan 28, 2014 - Pinout of ATX (ATX12V) 24 pin power supply connector and layout of ... and later (ATX12V 2) is common ATX standard, 24 pin connector. ... Power Ok is a status signal generated by the power supply to notify ... 10, 12V, Yellow, +12 VDC ... 18 AWG is recommended for all wires except pin 11, which should ...

ATX power supply connector pinout diagram @ pino


Dec 16, 2015 | Cars & Trucks

1 Answer

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

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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

2 Answers

The power supply came with no manual. There is no P IV power lead. There are two aux power leads. (1) four wire (O,B,R,Y) and (1) six wire lead (B,Y,B,Y,B,Y) The original power supply P IV lead has four...


As you've noted you need two Black wires (Ground), and two Yellow wires (12 Volt),
for a 4-pin ATX +12 Volt power cable,

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

If you are not using the 6-pin PCI Express power cable,

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

,rob the 4-pin ATX +12 Volt power cable connector, and wires from the old power supply.

Splice the wires of the 6-pin PCI Express to them.

Note:
Orange wires are 3.3 Volt
Red wires are 5 Volt
Yellow wires are 12 Volt
Black wires are Ground wires.

You need two Yellow wires, and two Black wires.


Or if you have a spare 4-pin standard Peripheral power cable from the power supply,

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

,buy and use an adapter power cable.
Example,

http://www.directron.com/p4atx.html

Nov 27, 2010 | Coolmax Technology COOLMAX M500B 500W EPS...

1 Answer

PC was caught in a lightning storm, and now will not boot (only at random). It seems like it's not getting power, when it does it'll boot normally. But when the storm hit my LAN was disabled and I had to...


Test whether it is the Power On switch, or the Power Supply. Since the LAN card bit the dust, you may be looking at a worse problem, though.

Bypass the Power On switch.

If the Power Supply comes on, the problem is the switch.
[One generic ATX Power On switch, that I have found fits many computers,

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

If the Power Supply does not readily come on, the problem is the Power Supply.

To bypass the Power On switch, you will be using a jumper wire on the
24-pin ATX main power cable connector.

Looks like this,

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

(Not necessarily the same color, and isn't located in the same position on your motherboard, as shown in the link)

Motherboard orientation:
Processor to the top, Ram Memory slots to the right.

The 24-pin ATX main power cable connector on the motherboard, is to the near right, of the number 4 Ram Memory slot.

In case you do not have the Owner's Manual, for your Inspiron 530 desktop computer,

http://support.dell.com/support/edocs/systems/inspd530/en/index.htm

On this page left-click on -
Owner's Manual - View - Download - (HTML 3.44MB)

Left-click on - Removing and Installing Parts
Left-click on - System Board Components
(System Board = Motherboard)

Number 7 - main power connector (ATX_POWER), is the
24-pin ATX main power cable connector, on your motherboard.

Referring back to the Playtool link, you will see a wire with Green insulation on it.
This is the Soft Power On wire. (PS_ON)

A jumper wire is used to connect it to ANY Black wire.
ALL Black wires are Ground wires.

[This is a DC circuit. There is a Positive, and a Negative.
A Ground wire is a Negative wire.

The green Soft Power On wire, is a positive wire containing 5 Volts.
You are completing a circuit.
The Soft Power On circuit.
You are bypassing the Power On switch]

There is no splicing of the wires to connect the jumper wire.
The jumper wire will go down into the socket holes, of the 24-pin ATX main power cable connector.

One end of the jumper wire goes down into the socket hole, containing the green Soft Power On wire.
The other end of the jumper wire goes down into a socket hole, with ANY Black wire.

The 24-pin ATX main power cable, is connected to the 24-pin ATX main power cable connector, on the motherboard.
Just as shown in the photo to the far right on the Playtool link.

The back of the 24-pin ATX main power cable's connector, is where the wires come in.
(The front of the power cable's connector is plugged into the motherboard)

I use a jumper wire that is approximately 3 inches long. (7.62cm)
An insulated wire. Both ends of the insulated wire are stripped of insulation, approximately 1/2 inch. (1.27cm)

One bare end of the jumper wire, goes down into the socket hole of the Green wire. Right next to the wire.
It has to go pretty far down in there.

At the end of each power wire, going into the 24-pin ATX main power cable connector, is a metal terminal pin. (Actually is a round hollow metal pin)
The jumper wire's bare end Must touch that metal pin.

The other end of the jumper wire, goes down into ANY socket hole with a Black wire.
(ALL Black wires are Ground wires)

Power Supply (Computer) plugged into power, the jumper wire is inserted.
The contact is a very BRIEF one. No more than 2 seconds.
(The Power On switch is a Momentary Contact Switch)

I suggest you also check the 12 Volt power rail. Check it with everything plugged in, inside the computer, and the computer on.
You need the Power Supply to have a load to get an accurate test.

There are 3 Voltage power rails in the Inspiron SMPS.
(Switched-Mode Power Supply, or just Power Supply for short)

A) The 3.3 Volt power rail
B) The 5 Volt power rail
C) The 12 Volt power rail.

The main one to check is the 12 Volt power rail.
[Orange wires are 3.3 Volt.
Red wires are 5 Volt.
Yellow wires are 12 Volt ]

The Positive (Red probe lead of the multimeter, is connected to any Yellow wire, coming out of the Power Supply.
The Negative (Black) probe lead of the multimeter, is connected to any Black (Ground) wire.

See if there is an unused standard 4-pin Peripheral power cable.
It has 1 Red wire, 1 Yellow wire, and two Black wires.
Connect to the Yellow wire, and to one of the Black wires.

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

[Multimeter function set to DC Volts. If it has it, set it to the 0 to 50 Volt scale]

11 to 13 Volts is Okay, but I prefer the voltage to closer to 12.
11 Volts indicates it's time for a new Power Supply.

Jul 27, 2010 | Dell Inspiron 530 Desktop Computer

2 Answers

Dell Dimension 8200 does not power up.


i have had the same problem it is a very simple way to fix you need to unplug the main power that goes to the motherboard and use a paper click to jump it and then quickly plug it in.
im sorry but i do not remember which 2 slots to use the paper click on but i know 1 was black and when you unplug your pc you will have to repeat this process each time

Feb 18, 2010 | Dell Dimension 8200 PC Desktop

3 Answers

Cannot turn on cpu


when you say cannot turn on cpu - what do you mean - ?
cannot boot up?
try removing the cmos battery for a minute then replace and try again.

any error beeps ?


working fine before ?

Oct 11, 2009 | E-Machines eMachines Desktop PC

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