Question about ACM Supplies Computers & Internet

1 Answer

On my computer, how do i know whether my switching power supply or my motherboard are faulty ?

Posted by on

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    MVP:

    An expert that got 5 achievements.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Contributor
  • 28 Answers

As with most PC hardware problems, if the problem is persistent, just swapping out the suspected part with a known good unit can tell you right away if that solved the problem. You can also test a power supply with a power supply tester. They range in price from around $10 to more than $100. However, unless you plan to go into the PC repair business, spending that money on a replacement power supply might be a better investment. Even if it doesn't solve your immediate problem you might need a good spare at some point in the future. Most PC power supplies are interchangeable. Just buy one with a high power rating (500 watts is good for most consumer PCs). Some mother boards provide utilities in the BIOS that display voltage level and power fluctuation measurements. If your motherboard offers that feature and it shows your power is suspect, you don't really know if a component on the board is the culprit or the power supply is failed, but this could be a way to confirm if swapping out the power supply restores the power to proper voltages, etc.

Posted on Oct 20, 2013

  • John Adams
    John Adams Oct 20, 2013

    If the problem you are experiencing is persistent then swapping out the power supply for a known good unit will let you know right away if that solved the problem. You can also purchase a power supply tester.

    I have seen models ranging from $10 to over $100 however if you're not planning to get into the PC hardware repair business that money might be better spent on a replacement power supply. Even if it doesn't solve your immediate problem you may need one at some point in the future, assuming you plan to continue doing your own repairs.

    Some PC motherboards provide a utility in the BIOS that displays PC power quality measurements (voltage and ripple). If the power appears to be out of spec you still don't know if the problem is the power supply or a component on the mother board so you're back to swapping something as your primary troubleshooting step.

    The power supply is much easier to swap out than the motherboard. If you replace the power supply and the BIOS now displays power readings that are within tolerance you know the problem has been fixed. If not, the problem is most likely with the motherboard.

    One last thing is to try reseating the power connectors. Don't just wiggle them, completely remove them from the motherboard and then firmly plug them back in. If you have lots of extra stuff (fans, lights, etc) plugged in to the power supply, especially if they are not factory hardware, try unplugging as much of it as possible during testing to see if the problem goes away. Once your machine is stable plug the extras back in one at a time, keeping a log of the sequence and recording system behavior for future reference.

×

Ad

3 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get to try the service completely Free afterwhich it costs $6 per call and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad
IB4G2008
  • 3587 Answers

SOURCE: Computer sometimes won't turn on when i press the power button

you are correct on one and two above, in your suspicions..how's your power from wall, and do you use a UPS?

check your computer warranty here 4 FREE

Posted on Feb 27, 2008

joecoolvette
  • 5660 Answers

SOURCE: CQ5110f Computer won't turn on

Suggest perform the simple test to see if the problem is the Power On switch, or the Power Supply.

This requires bypassing the Power On switch.
DOES NOT involve cutting any wires, or splicing any wires.

Before we go on I wish you to know this;

The metal case of the Power Supply, retains the dangerous high voltages inside.
100 to 240 Volts AC, depending on what country you are in.

The Power Supply is a Converter.
It converts the high AC voltages down into 3 low DC Voltages;
3.3 Volts, 5 Volts, and 12 Volts.

In comparison two D cell flashlight batteries produce 3 Volts DC.

The power cables coming out of the Power Supply, carry either
3.3 Volts, or 5 Volts, or 12 Volts; DC.
(Orange = 3.3 Volts. Red = 5 Volts. Yellow = 12 Volts)

The Power On switch deals with the Soft Power On circuit.
This circuit uses 5 Volts DC.

Posted, because I wanted you to know, I AM thinking of your safety at all times.
However like all connections made when dealing with electricity, there may be a small Spark.
You may wish to wear a glove on the hand, that deals with the jumper wire.

Going on..........

Let's look at the motherboard used in a Compaq Presario CQ5110F Desktop PC,

HP Support > Compaq Presario CQ5110F Desktop PC > Main Support page,

http://h10025.www1.hp.com/ewfrf/wc/product?cc=us&lc=en&dlc=en&product=3978596

Click on Product information > Product specifications > Motherboard Specifications, M2N68-LA (Narra5),

Motherboard is shown with no hardware components attached, nor cables. I'm just using it for Clarification. Everything is supposed to be attached when testing.

Look all the way to the Right side, and to the long black rectangular connector. Now look at the long whitish/yellowish connector under it.
Has two columns of 12 Socket Holes.

This is where your 24-pin ATX main power cable plugs in.
This is a general 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

[Note color of connectors does NOT matter ]

You need the main power cable plugged in, as shown in the photo to the far Right.
Observe the Green wire. This is the Soft Power On wire.
-> ANY Black wire you see is a Ground wire.

The preferred jumper wire is a paperclip.
Straighten it out, then bend into a U-shape. Turn the U shape over in your mind.
The Top of the U is wrapped a few times, with black plastic electrical tape.
This taped area is for your fingers, and thumb to hold onto.

The 'legs' are what is used for a jumper.

One leg goes down into the socket hole, with the Green wire.
The BACK of the connector is where the wires go in.
The leg goes down in the Back.
It slides down in the socket, RIGHT NEXT TO the insulation of the Green wire; and touches a metal female terminal.

This is an example of the female metal terminal. Just posting for edification,

http://www.mcmelectronics.com/product/28-9420&utm_medium=Affiliate&ref=cj&utm_campaign=CommissionJunction&utm_source=CommissionJunction

At the end of every wire going in the main power cable's connector, is one of these female metal terminals.
You can barely make out the round openings, in the middle photo of the Playtool link above.

For this reason you need to Ensure that the leg of the jumper wire, is indeed touching that metal female terminal.

The other leg of the jumper wire goes down into ANY Black wire socket hole.
Power Supply plugged into power.

The contact time is no more than 2 seconds. This is because the Power On switch is a Momentary Contact Switch.

IF, the Power Supply turns on, you have a bad Power On switch.

IF, the Power Supply does NOT turn on, you have a bad Power Supply.

This baby works in MOST personal computers,

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

The Power On switch is located INSIDE the plastic assembly, of the Power On Button.
I use a hair dryer set to low heat, and constantly, slowly, move the hair dryer nozzle; back and forth on the plastic of the Power On Button assembly.

Helps to soften the plastic enough, so that the assembly will spread far enough, to get the Power On switch OUT.

Awaiting ANY additional questions. Please post in a Comment.
(Remember, there is no such thing as a stupid question, just one that hasn't been asked yet)

Can guide in replacing the Power On switch, (Remove Front Panel), and in replacing the Power Supply.

Regards,
joecoolvette

[When you are finished working on a desktop computer, remove and reinstall the Ram Memory modules. ('Stick')
They always seem to get bumped loose.

Problem is you may not see it. In fact betting you won't.
Best method to ensure they are seated tightly, and correctly; is to remove and reinstall.

If you move the cables with the computer, you can lay it on it's side, opening of computer case -> UP; for more ease of working on it.

Your computer can lay on it's side, or upside down; and will work ]

Posted on Feb 18, 2013

Testimonial: "Thanks SO much for such a thorough and detailed solution! I really appreciate all your effort to help me. I'm not at the point that I can try it, though it certainly all makes sense. My pc surprised me and turned on! I'm afraid at this point to turn it off and try this test, but I will as soon as it has to be turned off. My husband wants me to wait. We are possibly moving in a month or less, and I'll certainly have to turn it off then. (I don't have the money at the moment to buy any replacement parts that I may need--plus I've not been able to even find the power switch--if that's what's going bad--any websites you could tell me that would have that part? THANKS AGAIN!!! I may be in touch when I do the test."

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Was told there should be a switch on the motherboard to test whether the power supply is supplying power. Can't find anything of that sort.


Test your PSU or replace it if your power supply units fan is not working your PSU is faulty

One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect/ boot up a computer hard drive

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your "((MOTHERBOARD TO YOUR HARD DRIVE))" make sure they have a secure connection and are not faulty or just replace them they could be faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty even the electrical extensions or just replace them they could be faulty a computer needs its connections to continue its cycle and have an end so any faulty leads will end up with a computer error hope this helps

May 20, 2011 | Biostar N68S3+ AM3 NVIDIA MCP68S Micro ATX...

1 Answer

I have a Gateway Intel Pentium 4 that won't turn on, the power button light turns on but nothing else. The power supply test switch shows that the power supply is good, and when the switch is pressed all...


Test your PSU or replace it if your power supply units fan is not working your PSU is faulty

One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect/ boot up a computer hard drive

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your "((motherboard to your hard drive))" make sure they have a secure connection and are not faulty or just replace them they could be faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty even the electrical extensions or just replace them they could be faulty a computer needs its connections to continue its cycle and have an end so any faulty leads will end up with a computer error hope this helps

Apr 26, 2011 | Gateway Computers & Internet

1 Answer

Hi my power went out and when i turn on my computer i get a red light on the tower and an orange light on the moniter


Hi,

The most likely cause of the problem you describe is a faulty power supply in your computer case.
If you have a second computer available, remove the power supply from the faulty computer & replace with the other. Switch your PC on again & check if it will turn on now.

If replacing the power supply doesn't solve your problem then you most likely have a faulty motherboard. If you determine that your power supply is faulty & want to buy a new one, they are relatively inexpensive and shouldn't set you back more than 20 - $30. Try to get one with a higher power rating of 400 watts or more for best results.

Please let me know if you need any further assistance and thank you for visiting Fixya.
Best wishes,
Graemevm

Mar 24, 2011 | LG Computers & Internet

1 Answer

Hi We have an Acer T120 with a faulty power on off switch. The housing which sits under the switch on the front panel has broken. Do you know whether it is possible to buy a replacement...


Hi Jean,
I don't believe it would be economically viable for you to purchase the front panel which houses the on/off switch. This may prove costly.
I would rather look out for a new case with power supply and transfer your motherboard etc. to the new case.
You should be able to get a new case & power supply from your local PC shop for under $50.
Best wishes,
Graemevm

Jan 03, 2011 | Acer Aspire T120 PC Desktop

1 Answer

Power button not working. computer won't turn on. I got a light on, on the mother board but computer won't turn on


This is usually caused by either a faulty power supply or a dirty switch. You can find out if it's the switch by pulling the wires off the motherboard where the power switch plugs in, and with the power supply plugged in, carefully short across the two pins. If the computer doesn't start, that rules out the power switch. The other likely culprit is the power supply. If you can get ahold of a different power supply, try hooking it up and power up the computer. If that daesn't work, chances are that your motherboard is shot. Good luck.

Apr 13, 2010 | Computers & Internet

2 Answers

No power how can i resolve it


If none of the front panel lights turn on when you press the power button, then check the power lead is connected properly to the switch mode power supply and to the mains outlet.
Also try a different power cord.
If it still does not power up then the switch mode power supply is probably faulty.
Install a different switch mode power supply in the desktop computer to see if it powers up (make sure the capacity of this power supply is equal or greater than the original power supply).
If you cannot get another switch mode power supply to test in your desktop computer, then take the switch mode power supply to your friendly computer shop and have them test it for you. Replace the switch mode power supply if it is faulty..

Nov 07, 2009 | ASUS motherboard P5S-MX SE LGA775 SiS671FX...

4 Answers

Computer powers on but then turns off after a few seconds


I know this is a late response but someone might have this similar issue which is generally caused by a faulty power switch on the case of the computer. The switch is stuck in the pressed or active position so when you power the computer the switch still being depressed or faulty turns the computer right back off again and you're stuck in this loop. The best way to identify if this is the issue is to remove the power shunt from the jumper then use a screw driver to jump the power connections that would turn the computer on... if it stays on the switch or entire case needs to be replaced whichever is easier

Aug 08, 2008 | ASUS P5W DH Deluxe Motherboard

1 Answer

My computer lights


hello,

i assume you know how to open your pc...

Solution (1)
1. make sure your computer is not plugged in
2. open the side panel
3. remove the memory card
4. plug in you computer
5. switch on your pc. you should hear a beep. this is to check whether your pc is still working.
6. unplug pc
7. re-install the memory card. make sure that it is firmly attached to the memory slot.
8. switch on again. this should do it.

else

Solution (2)
Try replacing your power supply unit (PSU). faulty PSU may not be able to supply enough power to your motherboard or other peripherals which is attached to your PC.

hope this post can help you :)

Aug 05, 2008 | Computers & Internet

1 Answer

Restart


try replacing your power supply unit... computer restart is sometimes caused by low voltage output from a faulty power supply.

hope this post helps.

Aug 01, 2008 | ASUS P5PE-VM Motherboard

1 Answer

Computer sometimes won't turn on when i press the power button


you are correct on one and two above, in your suspicions..how's your power from wall, and do you use a UPS?

check your computer warranty here 4 FREE

Feb 27, 2008 | Computers & Internet

Not finding what you are looking for?
Computers & Internet Logo

Related Topics:

27 people viewed this question

Ask a Question

Usually answered in minutes!

Top ACM Supplies Computers & Internet Experts

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers

kakima

Level 3 Expert

102366 Answers

David Payne
David Payne

Level 3 Expert

14161 Answers

Are you an ACM Supplies Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...