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How to test a computer power supply out of the unit

Not turning on

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AC voltage into it and DC voltages on at least one large plug---do not if got it out forget to look at the filter caps--seen some power supplies with several puffed up etc.


how to test a computer power supply out of the uni - 10_30_2012_8_37_19_pm.jpg10_30_2012_8_37_41_pm.jpg

Posted on Oct 30, 2012

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1 Answer

Drive will not turn on.


Step 1:
Just the drive or the computer ??
Test your PSU power supply unit or replace it if your power supply units fan is not working your PSU is faulty http://pcsupport.about.com/od/toolsofthetrade/f/powersupplytest.htm Testing & replacing the PC's power supply http://www.youtube.com/watch?v=hbNxhvm0czs

Mar 14, 2013 | Computers & Internet

1 Answer

My computer turns off automatically with light on keyboard and motherboard


HP Compaq dx2300 Desktop PC?

http://h20000.www2.hp.com/bizsupport/TechSupport/Home.jsp?lang=en&cc=us&prodTypeId=12454&prodSeriesId=3352967&lang=en&cc=us

90 percent of desktop computer failure, cab be attributed to;

A) The computer is dirty inside, to include the Power Supply.

B) The Power Supply is bad

Suggest you start with cleaning the inside of the computer out, but suspect the real problem is the Power Supply.

Why?

Because the CD-ROM is not working.

Primer:

Your Power Supply converts your household/business AC electricity, into 3 low main DC Voltages.

Depending on your country;
USA = 120 Volts AC
Europe = 220 Volts AC
Australia = 220 Volts AC
Japan = 100 Volts AC

This is converted into 3 low DC Voltages for the computer;

A) 3.3 Volts (DC)
B) 5 Volts (DC)
C) 12 Volts DC

Each of the above is a voltage power rail.
The amperage for each power rail is stated on a label, on the Power Supply.

Voltage times Amperage = Wattage

Again, Voltage x Amperage = Wattage

All of the amperage of the voltage power rails are combined, (Added together), to equal the maximum Wattage, the Power Supply will deliver.
This should be stated on the Power Supply label also.

A) IF, all of the LED lights were on at once, they would use less than 1 Watt of power.

B) EACH fan uses 2 to 3 Watts of power.

C) A typical Processor can use 51 to 125 Watts of power.

[ Intel Pentium Dual Core E2160? Can use up to 65 Watts,

http://en.wikipedia.org/wiki/List_of_Intel_Pentium_Dual-Core_microprocessors#.22Allendale.22.2C_.22Conroe.22_.2865_nm.29 ]

You press the Power On button. This in turn presses against a Power On switch,

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

This in turn, activates the Soft Power On feature of the Power Supply, and turns it on.

The first chipset to receive power is the BIOS chipset.

The BIOS program looks to see what devices are connected, does a Ram Memory count, turns the Processor on, then hands the computer over to the Operating System.

[ Windows XP and Windows 7, are two examples of an O/S ]

Primer over.

Your Power Supply provides enough power to turn the Processor on, then falls to it's knees. Doesn't have enough power to keep the Processor on.

[ A typical CD/DVD drive requires 15 Watts of power. It isn't there when all of the other hardware needs power first ]

Suggest you find a Power Supply that is KNOWN to be good, and COMPATIBLE, for a test unit.

Or you can test the 3 main voltage's coming out of the Power Supply, with a Multimeter set to DC Voltage.

Or you can just replace the Power Supply.

I would prefer you test with another unit, or test the voltages, before you spend your hard earned money.
It's up to you.

Diagnose the problem first. I could be wrong with the above, but if you diagnose using a test unit, or test the voltages, we will know whether the Power Supply is the problem.

Always start with the power First.

Perhaps there is an unused computer you may have access to, and can borrow it's Power Supply for a test unit. Has to be KNOWN to be good, and has to be COMPATIBLE.

What is Compatible? Means it has to have at least the minimum power cables, and the Power Supply must fit in the computer case.

(It is an ATX power supply)

Need recommendations for a Power Supply, post in a Comment.
Also will step by step guide you in replacing.

Regards,
joecoolvette

May 20, 2012 | HP Compaq dx2300 Microtower - RT950UTABA...

1 Answer

PS-6121-1C HOW TO MAKE UNIT WORK OUTSIDE OF COMPUTOR


Plug into motherboard, turn on computer.....(you dont need it in computer to test just pins)
Or you could buy a Power supply test device

May 17, 2012 | Compaq PS-5500-1C (244163001) 50-Watt...

1 Answer

No power - lights no fan


  1. Verify that the power supply voltage switch is set correctly. If the input voltage for the power supply does not match the correct setting for your country, your computer may not power on at all.

  2. Check for disconnected computer power cable connections. A loose or unplugged power cable is one of the top reasons why a computer doesn't turn on.

  3. Perform a "lamp test" to verify power is being provided from the wall. Your computer isn't going to turn on if it's not getting power so you need to make sure that the power source is working properly.



  4. Test your power supply. At this point in your troubleshooting, it's very likely that thepower supply unit in your computer is no longer working and should be replaced. You should however test it just to be sure. There's no reason to replace a working piece of hardware when testing it is fairly easy.

    Replace your power supply if it fails your testing.

Feb 21, 2011 | Acer eMachines E7254520 Notebook PC

1 Answer

When I turn on my computer it runs for a couple of seconds and then stops.


Unplug everything inside the computer, except the motherboard and the front panel power on switch. Power up the computer. If the PS fan continues to run, (power supply doesn't shut down)and the CPU fan runs, then power off the unit and reinstall each device, one at a time, turn the power supply on after each device is installed (and off, before installing the next device).
You can not easily start the power supply if it is not connected to the cpu motherboard.
If the power supply shuts down with only the motherboard attached, then you will need either another power supply, to test the MB, or another MB to test the power supply.
R

Feb 02, 2011 | Acer DPS-420GB (dps420gb) Power Supply

2 Answers

Power supply to my Inspiron 1525 shows green but when I plug it into the computer, it turns off. Computer will not start at all.


possibly a bad/faulty PSU power supply unit or its leads your computer might be shutting down to protect it from damage test all the leads that are attached to your hard drive from your motherboard and all of your drives cd/dvd 3.1/2 floppy including electrical extensions or just replace them they might be bad/faulty
hope this helps

Nov 28, 2010 | Dell POWER SUPPLY Power Supply

1 Answer

No power


Try these simple steps that I have below:

  1. Believe it or not, the number one reason why a computer won't turn on is because it wasn't turned on!
  2. Before starting a sometimes time consuming troubleshooting process, make sure you've turned on every power switch and power button on your computer:
  3. Verify that the power supply voltage switch is set correctly. If the input voltage for the power supply does not match the correct setting for your country, your computer may not power on at all.
  4. Check for disconnected computer power cable connections. A loose or unplugged power cable is one of the top reasons why a computer doesn't turn on.
  5. Perform a "lamp test" to verify power is being provided from the wall. Your computer isn't going to turn on if it's not getting power so you need to make sure that the power source is working properly.
  6. Test your power supply. At this point in your troubleshooting, it's very likely that the power supply unit in your computer is no longer working and should be replaced. You should however test it just to be sure. There's no reason to replace a working piece of hardware when testing it is fairly easy.

Sep 16, 2010 | Dell Dimension 2350 PC Desktop

1 Answer

HP Pavillion pc doesn't boot up ... no fan, no start sound, nothi


Bad Power Supply.

The blinking green light on the power supply, is a diagnostic light that indicates this.

Suggestion is to;
1) Test the Power Supply voltages
Or
2) Replace the Power Supply with a Known to be good, Compatible unit, for a test.

[Compatible:

A) It is an ATX style of power supply.
The style used by 90 percent, of personal computers out there.

Example: http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4975140&CatId=106

The test Power Supply unit should be mounted in the computer, for testing.
The power cables only reach so far, plus it is safer.

B) At least a 250 to 300 Watt unit, for a test unit. More Wattage is okay.

(The power supply that comes with the Pavilion a1310n, is a 300 Watt unit.

The 250 Watt unit stated above is just for a Test.
You are testing to see if the Power Supply is the problem.

More wattage is okay as a computer only uses what it needs.
If you have a 1000 Watt power supply installed, and the computer only needs 100 Watts; the computer only uses 100 watts.

The computer Will Not burn up, by installing a power supply with more Wattage than the original)

C) Correct amount of power cables, and correct kind.

Observe the power cables from the existing power supply, that are plugged into the various hardware components in the computer, and to the motherboard.

The test unit has to have the same power cables, and the correct amount of them.

Need help identifying these power cables, reply in a Comment.

The above may sound funny. Who has a spare power supply laying around, other than someone really committed to computers?

You may find yourself, or someone you may associate with, has a computer sitting in a closet, basement, attic or garage, that has a working power supply, (And is compatible), and can be used for a test unit.

Test the Voltages.

There are three main Voltages, produced by a personal computer power supply.
(DC. Direct Current)

1) 3.3 Volts (Wires that have Orange insulation)
2) 5 Volts (Red wires)
3) 12 Volts (Yellow wires)

(Two D cell flashlight batteries are 3 Volts {DC)

ANY Black wire is a Ground wire.

Use an economical multimeter to test the Voltages, or a power supply tester.

Multimeter:
Power Supply on.
Positive probe lead (Red) connects to the power wire to be tested.
Negative probe lead (Black) touches ANY Black wire.
(Black insulated wires are Ground wires)

This is one example of a power supply tester,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=5250576&CatId=5471

What causes Power Supply failure?

A) Inside of computer is dirty, as well as the inside of the Power Supply.

Computer unplugged from power, (Computer case open, and anti-static precautions observed), a can of compressed air for computers is used on a regular basis as needed, to help prevent this.

There are two cooling components for a SMPS.
(Switched Mode Power Supply)

1) The internal fan
2) The Heatsink's inside

http://en.wikipedia.org/wiki/Switched-mode_power_supply

A Heatsink, is an object used to draw heat from whatever hardware component, it is placed against.

A Heatsink is generally just a flat, square piece of metal, that has tall, thin fins protruding from it.

The flat metal base absorbs heat, whereby it is absorbed by the tall thin fins, and radiated away.

In the case of a Power Supply, there is an internal fan which draws air in-between the fins, helping to carry the heat away.

Once the fan blades, (Plus center hub, and surrounding cage), become coated with gunk, and the Heatsink fins become coated, the cooling capacity drops tremendously.

Heat = Wasted Energy.
The Power Supply has to produce more power, to keep up with loss of energy.
Eventually hardware components inside the Power Supply fail.

B) Cheap quality components used in the power supply. (Cheap quality power supply)

Awaiting any question you may have regarding this.
Post in a Comment.
(Believe upper right of your page)

May 31, 2010 | Dell XPS 420 PC Desktop

1 Answer

I turn on the power of my computer and it shows the compaq name then goes to a resume windows that is highlighted and when you click on it the screen goes black and the computer does not load


I suggest you have Power Supply problems. A failing power supply will emulate all kinds of software problems.

Let's start with the easy stuff first.

How dirty is the computer inside, and the Power Supply? Has the inside of the computer, and the Power Supply, been cleaned on a regular basis?

(Computer off, and unplugged from power, computer case open. A can of compressed air is used to clean)

From there I would suggest testing the Power Supply, (Requires a multimeter, or a power supply tester), or replace the power supply with a known to be good unit, for a test.

To summarize:

Let me know if the computer is dirty inside, and if you need guidance on how to clean it. (Power Supply also)

From there, if you wish I can guide you on testing your power supply, or replacing with a known to be good unit, for a test.
Simply state in a Comment.

This is HP Support, and the download page for a manual which instructs on how to open your computer case, (Page 118)

With this manual I can also guide you in replacing the power supply.

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?lc=en&dlc=en&cc=us&lang=en&product=326832&

Why do I think it's a power supply issue?

You don't have enough power to turn the Processor on.
Power Supply's are rated in Wattage.
Voltage times Amperage = Wattage.

1) ALL the lights require less than 1 Watt of power.
2) EACH fan uses 2 to 3 Watts of power.
3) A typical Processor requires 51 to 125 Watts of power. Depends on what processor it is.

The Compaq Presario S4020WM Desktop PC, comes with an AMD Athlon XP 2400 processor. (2.4GHz)
When operating at full capacity, this processor can use up to 68.3 Watts.

http://en.wikipedia.org/wiki/List_of_AMD_Athlon_XP_microprocessors

You have enough power to turn on lights, and spin fans, but not enough to turn the Processor on.

Apr 14, 2010 | Compaq Presario S4020WM PC Desktop

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