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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 5, 2011 at 4:31 am
HI ANIL,
What is the actual complain and what have you checked?
Jestine
Vemurugan
May 6, 2011 at 10:37 am
Thank you this information
Thanks a lot
Chitransh
May 16, 2011 at 9:44 am
How 2 conect the power, reset switches to my mother board..
Help me
admin
May 17, 2011 at 9:09 am
Hi Chitransh,
Try momentarily short the power good signal to ground.
Jestine
uvais
May 24, 2011 at 8:02 am
my smps seccontry section transister all leg is shot what is the problum plz give a answer
admin
May 25, 2011 at 1:19 am
Hi Uvais,
You need to trace the surrounding components that could have bad components.
Jestine
rohit
May 28, 2011 at 1:23 pm
how i can check smps power & ampire with hardware moniterning software
admin
May 28, 2011 at 10:09 pm
HI Rohit,
Sorry i have not use this kind of software before thus i can't provide any advice on this.
Jestine
Satish Thakur
June 1, 2011 at 2:04 am
Please tell me how to short the old SMPS like ATA SMPS or P3 machines SMPS
admin
June 1, 2011 at 10:51 am
Hi Satish,
Could you elaborate?
Jestine
tfq
July 17, 2011 at 11:46 am
Hello everyone.
My system does not power on. When I short the the 2 wires, the smps works, also when I connect the 20 pin to the board everything works fine. But when I connect the 4pin 12v connector to the board the smps stops working. Again if I short the 2 pins the smps again works. But when 4 pin is connected the smps turns off. Kindly help me solve my problem. Thanks in advance:-)
admin
July 18, 2011 at 9:15 pm
Hi Tfq,
Sometimes it can be a bad filter cap and you need to test it using ESR meter. Have you try on other motherboard because a bad motherboard may also cause such problem?
Jestine
tfq
July 19, 2011 at 1:00 pm
Sir, thank you for your reply. No i've not tested with other board. And as I'm not that good in electronics, l'll try takin the system to a service center. Thank you once again sir for your quick reply.
bijoy
July 31, 2011 at 5:04 am
thank you.(bijoy India.kerala.trissur
Amir Mukhtar
August 2, 2011 at 11:44 pm
Sir,
Nice Sharing informations
Thanks you
vora abbas
August 3, 2011 at 3:35 am
i conect 4 port SMPS power cable but not start and do not 4 port SMPS power Cable canect to start but not start mother board pls answare me
admin
August 3, 2011 at 9:46 pm
HI Vora,
Could you explain what do you mean by 4 ports power supply? Are you referring to ATX power supply? What is the complaint of the power supply and have you check?
Jestine
sushanta
August 6, 2011 at 10:00 am
I need laser printer power supply board repairing help.
part no rm1-2316.some easy method to diagnose.
admin
August 8, 2011 at 2:55 am
HI Sushanta,
May i know what have you check and replaced?
Jestine
A K SAXENA
August 26, 2011 at 10:40 am
In ATX SMPS I got bridge rectifier diodes , tr.Y13007 short and fuse blown .i replaced ,but still not working. pl guide me , thanks,
admin
August 26, 2011 at 9:32 pm
Hi AK,
Have you check all the components in the primary side and make sure no shorted secondary diodes and schottky diodes.
Jestine
manish
August 27, 2011 at 1:13 am
hello sir
sir m not know much about computer hardware so plz sugges me in easy way sir problem is that my computer turned automatic off when i refere to it to a shop then the shopkeeper asked me that your smps is gone take it new so can you tell me sir that how can i cheke it and what about it normally price in india.thank you sir.sir when i start it then nothing is desplayed on moniter i also cheked moniter its works properly c.p.u. fan run but tell me what is its problen ? help me sir
thank you very much mr.Jestine sir
admin
August 27, 2011 at 7:41 am
HI Manish,
Sorry i do not known the power supply price in India. If the shopkeeper says that it has problem then you may need some electronics repair experience to troubleshoot the power supply. Since this involve high voltage i suggest that you do not repair it if you do not have experience in electronics repair.
Jestine
AK SAXENA
August 27, 2011 at 10:06 am
sir thanks for guidance in ATX SMPS repairing tips . problem has solved now..its a great achivement to me ... with regards, ;AK SAXENA BHOPAL
admin
August 27, 2011 at 8:31 pm
HI AK,
What have you replaced?
Jestine
AK SAXENA
August 28, 2011 at 10:12 am
Because of ATX SMPS TEST test tip I got confidence & conformed that supply is o k, there was some loose connection....thanks again.
Vidya Jha
August 29, 2011 at 8:10 am
Sir, I want the circuit of Hipro's smps model no. HP-A2307F3T.
How can I get it??
admin
August 29, 2011 at 9:12 pm
HI Vidya,
Sorry i do not keep schematic diagram.
Jestine
balakrishna.a
September 7, 2011 at 12:06 pm
bestec smps gray pin 5v missing? how to rectifing problem.pls tell me.
admin
September 9, 2011 at 2:46 am
HI Bala,
Tracing it backward fom the 5 volt line. it can be bad caps, leaky diode or open resistor.
Jestine
Joseph Alukka
September 12, 2011 at 1:34 am
Hi ,
I have a 400W ATX smps lying around which I'm trying to repair to run an old motherboard. Got it from my cousin with the fuse blown off. On checking, I found that both 13007 switching transistors had blown out in a power surge of which one was shorting the circuit. The bridge, capacitors and rest were fine, so replaced both 13007's along with the fuse and tested all caps on the whole board and all components on the primary side. Connected a 35w automotive bulb as load onto the +5v and on switching it on, the supply was fine and gives steady +5 on the VSB line. But when I short the PS_on to GND to switch the supply on, the smps starts making a arcing like sound as if something had a loose connection. It was clearly from the transformer, so disconnected and de-soldered it out and checked, but it seems to be fine. Tried resoldering everything and powered it up again but the same arcing sound. The smps fan tries to start, but moves a bit and stops. Checked the voltage on the lines, everything was low at around 2v on the 5v lines.. After 10 secs, the NTC blew up and the supply died again. The opto seems fine when tested out of the circuit.
I am sure of a shorted semiconductor somewhere on the secondary but could you point me where to start? The circuit has SB1040, STPS201 rectifiers and something called STPR10 on the secondary. The PWM is a TL494 and controller is a PJ339 but I have no Idea how to check these. No other diodes or resistors seems to be blown visually. I hope the 35W bulb wont be a problem.
Thanks a lot!
admin
September 12, 2011 at 8:33 pm
Hi Joseph,
I suggest that you directly replace the tl494 and lm 339 and also recheck again all the components in the primary side. I don't think there is any shorted diode in the secondary side because you already got the 5 volt. I suggest that you put in the original load as in certain power supply, a less load will cause overvoltage thus shutting down the power supply.
Jestine
Joseph Alukka
September 13, 2011 at 10:53 am
Thank you Jestine for your reply, I replaced all the caps on the secondary as most of the sources on the net pointed to having caps with a bad esr on the secondary making such noises from the transformer. I didnt have an ESR meter, so directly replaced all the caps, but on checking the primary again, the 13007's had shorted again the last time my NTC had blown and all those sounds were made and I got a low o/p but good 5v vsb. So what would you suggest, the problem indicates an active short circuit somewhere around the primary, but all the components show up fine. What could possibly overload the 13007 and kill both of them and blow the NTC twice?
Joseph Alukka
September 13, 2011 at 10:58 am
Also Im not sure if I should replace the 2 IC's as VSB is generated through a separate small transformer and so I think we cant say secondary also has problem. Can a bad feedback kill the 13007? Also the chip is shown as PJ339, is it LM339?
Joseph Alukka
September 14, 2011 at 11:50 am
Bro please help me.. Im totally fed up with this smps of mine.. I replaced all caps on primary and secondary, replaced LM339 and TL494, replaced the 2 switiching transistors 13007 and still now I have the same problem when I connect to motherboard + processor + hard disk. 5v vsb works fine, but when I press power button, the processor fan tries to spin, but moves a little bit and stops and the smps makes a strange sound like arcing from the transformer.. There is pretty much nothing in my smps to replace, and I just want to get it working as I already wasted a lot on it.. all caps, all ic's and all transisors have been replaced.. and i tested each and every zenner and diodes and rectifier.. what could could be the problem? can I isolate the primary and secondary sections and check individually? how? please help bro.. wasted a lot of time and money..
admin
September 15, 2011 at 7:00 am
HI Joseph,
Yes troubleshooting can be frustrated especially afetr spending so many hours on it. O
admin
September 15, 2011 at 7:06 am
HI Joseph,
Yes troubleshooting can be frustrated especially after spending so many hours on it. One thing you should know that in fact you are learning new things during this tough time. Would you like to repair all power supply that need to change fuse only? You will not go further just by always changing fuse. In your case, this type of power supply is hard to isolate because it seems like a complete loop. Missing one part of components or circuit could cause the power supply not to work. Since you have check all the components in the primary side, then now you should concentrate checking components in the secondary side resistors and small transistors. An open resistor surrounding tl494 ic and leaky transistors that is located near the secondary side of small transformer will cause similar symptom.
Jestine
joseph
September 16, 2011 at 3:52 am
thanks a lot justine.. I design and make a lot of digital circuits myself.. Im more into microcontroller programming.. But repairing something designed by someone else seems like a headache to me cos i dont know how it works.. This is my first time with smps.. I normally work with self made linear power supplies or out of the box tiny smps.. I have repaired a lot of electronic stuffs, but when inductors and high frequency/ voltage elements like in smps comes, im helpless.. Repairing is more headache than making, i have realized that 🙂 thanks a lot for that tip.. After a little study on pc smps, now i think the problem is in the overvoltage section.. Ie, the tl494 making it to cycle.. Thanks again!
D.V.S.CHALAPATHI RAO
September 16, 2011 at 10:43 am
Can anyone please guide me usinhg 2 SMPS power suppliies simultaneously to the same PC for sharing load. Can I use the 2nd SMSP to work by shorting the pins as shown in picture.
Tha basic idea of using 2 smps is to share the load . All the usb connected devices and motherboard supplied from 1 SMPS and all the power to drives / Hard disk/ Fans from other SMPS.
I know it is better to uprade to higher wattage. But any one please guide me of using two power SMPS
guru
September 16, 2011 at 11:19 pm
my problem with smps is the fan rotates when i short the green and black wire but when i connect it as external power supply to kfir interface card it switches of.fan stop rotating with a small sound.can u help?
admin
September 19, 2011 at 5:59 am
Hi Joseph,
You are welcome!
Jestine
admin
September 20, 2011 at 7:15 am
Hi Guru,
Have you checked all the filter caps in the secondary side?
Jestine
admin
September 20, 2011 at 7:19 am
HI Rao,
Sorry i do not have info about using 2 power supplies to increase the watt. You can short the pin of the power supply but you must have a load so that the output voltages will be more steady.
Jestine
Ajay
September 23, 2011 at 1:45 am
Hi,
I have a HP slimline s3500Z PC with an ASUS mother board with AMD processor..The motherboard and processor both had gone bad few days back. As I couldnot got the same mini-ITX motherboard in India or anyother mini-ITX that supports AMD processor I decided to change both of them............I got an intel based motherboard from Zotac (ZOtac nForce 630i-ITX) along with Pentium Dual core processor...But now I am facing a strange problem
1) The SMPS if shutting off (an LED in the SMPS goes off, fan stops..) after 3-4 seconds of switching on the PC...but the same SMPS is working very fine with my another PC.
2) My new mother board is also fine as it is working on another SMPS and I was able to load the OS...and there is no problem...that can indicate problem in the motherboard...
As both the things are working when checked ...what cane be the problem....I cannot simply put a new SMPS in the PC as it is a slimline and not all power supplies will fit....and MY SMPS is working fine
so then Why it should shut off with this motherboard...which is also working with another SMPS...
Can somebody give me some help in this strange problem...Is some compatibility issues known in HP power supplies when connected to other motherboards
thanks
Ajay
admin
September 26, 2011 at 3:04 pm
HI Ajay,
From your description it seems that the original power supply does not support the new motherboard.If you put back the old board and the power supply could work then it is confirm that the power supply does not support the new board.
Jestine
Peter Wells
October 1, 2011 at 4:20 am
Hi Jestine,
I have a Delta DPS-350-8A power supply in my HP computer. I noticed a "hot electronics" smell so I shut down the computer (working normally) and checked. The smell was coming from the power supply box. I opened it and found the larger output toroidal coil was discolored dark, the coating on the copper wire blistered. Also 3 capacitors have bulging tops. So it is working but apparently some kind of excess load? Any idea what would cause this and what needs to be replaced?
Thanks,
Pete.
admin
October 3, 2011 at 2:26 am
HI Peter,
It seems that the inductor have problem and need to be replaced with only the original one. Why it burned can be cause by many factors like bad quality, bad design (hot environment or the fan was not working), overload of the current demanded by the board and etc.
Jestine
Peter Wells
October 3, 2011 at 3:09 am
Hi Jestine,
Thanks for your answer, much appreciated.
I hope it is not an overload in the motherboard or drives...I hope that a new power supply will fix it.
It was not a hot environment, it happened first thing in the morning when I switched on my computer. The fan in the power supply box was working, I checked before I shut down.
Do I understand your answer correctly that it could have been an overload within the power supply board itself? In that case could the motherboard and drives be OK (as all was working OK when I shut down due to the smell)?
Regards,
Pete.
admin
October 4, 2011 at 2:08 am
Hi Pete,
The power supply can't overload it self unless there is an external load. Since the motherboard and the drives are ok then most probably the problem was due to bad quality of components used.
Jestine
naval
October 5, 2011 at 6:56 am
can i take 24volt additonal output from a normal atx smps