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ATX SMPS Test
By Jestine Yong on September 5, 2007
ATX SMPS Test is very easy. Just use a scrap motherboard and connect the power supply onto it and place a wire across the two pins shown in the picture below in order to turn the ATX power supply “On”. If possible place two more harddisk to act as load just incase the single motherboard load not enough to switch it on. The symptom could be the fan rotate for a while and then totally stop!
Be cautious that not all ATX power supply support all kinds of motherboard. Some power supply just need back its own motherboard or system in order to function properly. Hope after reading this tips you should not have any more problem for ATX SMPS Test.
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admin
May 11, 2010 at 10:13 am
HI Anil,
Have you check all the filter cap? Did you connect the power supply to a load?
Jestine
reymark
May 13, 2010 at 1:44 am
i want to see the schematic diagram of your product which is the ATX power supply tester, is it possible? can i see all the schematic including the internal schematic and external? can you please give them all for our project proposal?
admin
May 13, 2010 at 3:08 am
HI Reymark,
Sorry i do not have ATX power supply tester schematic.
Jestine
Nafish
May 14, 2010 at 3:00 am
I M learn chiplevel
admin
May 14, 2010 at 11:00 pm
Hi Nafish,
Could you elaborate?
Jestine
Nafish
May 21, 2010 at 5:49 am
Hi i m nafish ahmad
admin
May 21, 2010 at 8:48 am
Nice to know you Nafish.
Jestine
BHIMSEN
May 25, 2010 at 2:24 am
yesterday when i connected mains to it, there was a little explosion and nothing displays on my pc.please anybody help.....
admin
May 25, 2010 at 7:41 am
Hi Bhimsen,
You need to check on the bridge rectifier and other semiconductor components in the power supply primary area since you said the fuse blown.
Jestine
sankar kumar majumdar
May 29, 2010 at 12:53 am
i want to lern more about atx smps send me feedback
admin
May 29, 2010 at 5:39 am
HI SANKAR,
All i have compiled it into an ebook http://www.powersupplyrepairguide.com
Jestine
mushtaq
June 4, 2010 at 7:38 am
but some times it worked but there occured no display
admin
June 4, 2010 at 8:54 am
HI Mushtaq,
You may need to check all the filter caps.
Jestine
mahesh kumar
June 7, 2010 at 10:52 pm
I am faceing ATX SMP 110V Its restarts again & again than stop
Please which portion may be problem (Components) should i check
admin
June 8, 2010 at 4:20 am
HI Mahesh,
It can be filter cap or any bad components in the primary or secondary section. Make sure the power supply is connected to a load like motherboard and the filter caps are good.
Jestine
Ronald Liem
June 11, 2010 at 3:36 am
Dear Sir.
I would like to ask you about signal to or from SMPS PSU.
1. PWR FAIL
2. PWR GOOD
Is those out or input to the PSU?, whats the level?.
Thanks
admin
June 13, 2010 at 8:41 am
HI Ronald,
Power good is 5 volt and there is no power fail signal. The power good is an output signal from the SMPS.
Jestine
surajsam
June 15, 2010 at 11:55 pm
sir my snps problums is not work properly out put power is dead
sir plz help me
admin
June 16, 2010 at 5:02 am
HI Sur,
You may need to check all the components in the power supply side.
Jestine
Rana
June 21, 2010 at 4:18 pm
When I am trying to power on my PC. It start for 1 seconds and stop. I have changed my smps . Now its working fine. What may be the cause . Is it possible to repair my SMPS.
admin
June 21, 2010 at 9:40 pm
HI Rana,
Yes it is possible to repair it but you may need some skill on testing those electronic components particularly the ESR of electrolytic capacitors.
Jestine
MD FAISAL
June 22, 2010 at 11:18 pm
My PC keeps switching off after few minutes of working. Sometimes it works for hours before switch off. some times it switches off in minutes. I checked the temperature of the CPU it is around 40-50 C. I am using windows and ubuntu ad dual boot. in both the OS the problem s there. My friend says thet this is SMPS problem. He opened the SMPS and says that somethng( i think capacitator) is looking bulged.He asked me to replace the SMPS. Cant't it be repaired. I am using Zebronics 400W(SATA)Economy Series( 20 +4 pin). My question is if there is some problem in the SMPS it should not start at all. How come it works for hours sometimes? pls help.
admin
June 23, 2010 at 9:58 am
HI Faizal,
Your friend is right and you need to replace those bulged caps. Bulged caps in the supply line can cause voltage to be low thus affecting the pc motherboard performance.
Jestine
satishkumar
June 23, 2010 at 12:09 pm
my computar starts after 10 minits. is smps is faulty? what is the service center cantact at mumbai or kalyan
admin
June 24, 2010 at 6:07 am
HI Satish,
I'm from from mumbai thus i do not have info on that. Your problem could be the motherboard or the smps. You may need another good smps to confirm it. If the smps is the cause then check inside to see if there is any bad caps or not.
Jestine
MD FAISAL
June 27, 2010 at 9:14 pm
I replaced the SMPS. Still having the same problem. The PC shuts down after 1-2 hrsof use. i checked the CPU temp using a program called speedfan. the temp is around 30-40 C. What else could be wrong.
admin
June 28, 2010 at 5:21 am
HI Faizal,
I'm not sure about the temperature but since you have replaced the smps then it is not the smps fault. Did you see any bulged e-caps the in the motherboard?
Jestine
MD FAISAL
June 28, 2010 at 10:39 pm
yesterday the PC was working fine. i am not able to understand this. the warranty is going to end next month. As I purchased an assembled PC I have to take the specific component which is having the problem. And the problem is also random.how to pinpoint that a specific component is faulty.
admin
June 29, 2010 at 8:06 am
HI Faizal,
Since you said the smps is good then send the motherboard for warranty claim.
Jestine
Ramsingh
July 1, 2010 at 6:50 am
I am recivin 10. V in red,25v in yellow so tell me what is problam
admin
July 1, 2010 at 8:32 am
Hi Ramsingh,
It seems that the power supply have overvoltage problem. If this power supply have the optoisolator circuit then please check this area (secondary side ) for high ohm resistor and etc. Check all filter caps too with ESR meter.
Jestine
Deepak
July 18, 2010 at 10:33 am
thanks its working............
jadhav
July 31, 2010 at 2:40 am
I have15 inch lcd moniter. it displays goes off within 15-20 seconds but the power LED remains 'ON' also secreen shows half white tell me what is the fault
admin
July 31, 2010 at 4:30 am
HI Jadhav,
Make sure there is no bulged e-caps and the backlight is good. One of the backlight have problem could cause it to shutdown. Assuming you have solve the problem and the display half screen only then the problem is in the lcd panel and there is no way to repair it.
Jestine
Raju
July 31, 2010 at 6:47 am
when i short green and black color wire then my smps fan is running but when i conncected it to motherboard then cpu fan running for short time and stop what is the problem plz solve
admin
August 1, 2010 at 2:50 am
Hi Raju,
It can be the POWER SUPPLY itself or the motherboard have problem.Try use another working power supply to test and see how it goes. If power supply fault then check the filter cap for bad ESR.
Jestine
neyaz
August 4, 2010 at 7:36 am
Hi
I have Dell Work station (Precision 650) its not swithing on. How i will be chek SMPS is good or Bad ?
admin
August 4, 2010 at 8:16 am
Hi Neyaz,
You need to open up the power supply casing and check for the fuse and other components. However, if you do not have experience in electronic repair i suggest you send it to a repairer.
Jestine
Bhakta Charan Das
August 5, 2010 at 6:45 am
Respected Sir,
My PC SMPS fan is not working, so what I do now sir. Please give me any tipes about this regards.
Thank You Sir.
admin
August 5, 2010 at 8:18 am
Hi Bhakta,
Only the fan not working? Is the power supply working? If only the fan then i suggest that you service the fan with oil based spray or replace with a new fan since it is quite cheap nowadays.
Jestine
neyaz
August 6, 2010 at 3:50 am
Hi
I already open SMPS i know litilbit about electronics. Fuse is good and all components is loking good. but in odanary SMPS option is their short the Gren and Blue Wire then its run if its good condition but in my case this is fully difrent SMPS (NPS-460BBB). In ckt one pin is mention PS_ON. i was short with ground but nuthing is happen.If you know Exect pin for swithing on please tell me.
admin
August 6, 2010 at 4:45 am
Hi Neyaz,
Usually for ATX you need to short the two wires. In your case, it could be different wires but you already mentioned that you have shorted the PS_0n to ground and still no power then the power supply itself have problem. If you still no confident about those pins you can connect the power supply back to the system and turn it on from the system.
Assuming if still no power then you may need to check the components in such like check for shorted secondary diodes, or even bad start up resistor. If the power supply totally have no output (zero volts) then i suggest that you test all components in the primary side.
Jestine
Prakash
August 6, 2010 at 7:20 am
Hi all,
when I power on my computer the SMPS fan not move & in motherboad fan hdd lights not glow.I shorted green +black pin of 20 pin smps connector the SMPS fan moving now but no movement in motherboard no fan move,no beep.I fixed the 20 pin connector(SMPS)on m board & On moterboard PWR pin shorted but still not working SMPS FAN AS WELL AS M BOARD PLEASE HELP ME...........
admin
August 6, 2010 at 9:35 pm
Hi Prakash,
That means you may have a blown power supply because it does not have response at all.You need to open up the power supply and check the components especially the primary side. It can be a blown fuse, shorted semiconductor or even an open resistor. If you do not have experience in electronic repair i suggest that you send it to a professional.
Jestine
jimmy
August 15, 2010 at 1:07 am
i got a complaint on switching transtitor .transistor is ok ,no switching done what to do next.
admin
August 15, 2010 at 2:55 am
Hi Jimmy,
You may need to check all the components in the primary side. Sometimes a bad secondary diodes or filter cap could cause no power symptom.
Jestine
Mani
August 21, 2010 at 2:09 pm
Dell MK463 (NPS-750 ABA) PSU not switching ON. +5V Standby & PS_ON signals are present. The relay on board doesn't switch ON & fan doesn't rotate when PS_ON is grounded. The supply to relay coil is only 6V instead of 12V when PS_ON is grounded. No leaking caps found. Kindly help to troubleshoot further.
admin
August 23, 2010 at 5:01 am
HI Mani,
Try check the optoisolator IC area especially the resistors or even the Tl431IC. I'm not sure if this model have this components or not but if there then you may need to check it. Check also for bad components in the primary side especially the current sense resistor because an increase in resistance value could cause the output power to drop to half.
Jestine
sandeep kathar
August 27, 2010 at 10:46 am
hi thanx for information
Mangat
August 28, 2010 at 6:54 am
My SMPS Properlly stop, what reason. Sugesson me With Diagram and Point to Point