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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
August 28, 2010 at 9:22 am
HI Mangat,
Sorry i do not carry any diagram. I suggest that you check all the components in the primary side. Check also for shorted diodes in the secondary side.
Jestine
Vishal Anand
September 2, 2010 at 4:24 pm
Sir,
i want to know that floppy drive connector has one red wire to supply 5v and another yellow wire to supply 12v power supply.now my question is why do we need to supply these two wire of different voltage to the floppy drive.
admin
September 3, 2010 at 5:56 am
Hi Vishal,
12 volt is for the motor and 5 volt is for the circuitry.
Jestine
kazisamimahamed
September 5, 2010 at 11:36 am
smps diagram
admin
September 6, 2010 at 10:28 am
HI Kazi,
Sorry i do not keep any schematic diagram.
Jestine
Prashant
September 8, 2010 at 4:58 pm
Hello,
I have a 9-year-old Pentium 3 based system with a Mercury 815E mainboard and ATX SMPS (230W). Since last week, my PC restarts whenever a CD/DVD is inserted in the DVD drive. Even during a cold boot, if there is a disc in the DVD drive, the PC keeps restarting. Today, I heard some sounds (sparking sounds... but no sparks) coming from the SMPS unit. I searched the web and found out that the SMPS could be faulty. I have a spare SMPS from a Pentium 4 system (10x2 + 2x2 power connectors).
Question: Can I use the SMPS for the Pentium 4 system to power my Pentium 3 system? I need to just connect the 10x2 connector and leave out the extra 2x2 connector meant for Pentium 4 processors. Will this work?
Thanks in advance...
Prashant
admin
September 14, 2010 at 7:04 am
Hi Prashant,
Yes you can use the Pentium 4 power supply on pentium 3 board.
Jestine
midhun p.p
September 21, 2010 at 6:27 am
smps is very usful
mhadz
September 22, 2010 at 7:37 am
what is the part number of the zener diode 1(zd1) because it burns i didnt know what number is it i cant replace it
mhadz
September 22, 2010 at 7:38 am
the model is atx p4 400w
admin
September 22, 2010 at 8:02 pm
Hi Mhadz,
Sorry i do not know that value because i do not have the schematic.
Jestine
TAPAS
September 24, 2010 at 2:31 pm
want to know all problems related to smps
admin
September 24, 2010 at 7:29 pm
Hi Tapas,
Is all compiled into my SMPS repair ebook.
Jestine
varinder
September 28, 2010 at 2:49 am
Good day sir Jestine just want to ask. I have atx psu got repaired by myself. The power is all ok but when i check the voltage out put it turns out that the output is like breathing or fluctuating. the 12v is like 11v to 12v, 5v 4v, 3.3 3v… ..Would you give e some tips if it is on the primary or secondary section…By the way i change all the filter capacitors in the primary and secondary section thanks in advance and more power…
admin
September 28, 2010 at 4:25 am
Hi Varinder,
Have you testes it with a load? Less or missing load could cause it to fluctuate. If you have tested it with a load then there could many reason why it fluctuates-bad PWM IC in the secondary side, faulty components in the primary side and even failure components at the PWM IC area.
Jestine
Akhil John
October 3, 2010 at 9:09 am
My system seems to be mall fuctioning,I figured out the problem is caused by the mall functioning of my smps.I have an Iball cabinet with an intel GV845SR mother board.The symtoms are "The power and hard disk LED blinks for some time when i press the power butten and then stops".When I opened the SMPS box i found some dry soldered joints.So If any one can can help me please leave me a mail.
admin
October 3, 2010 at 9:25 am
Hi Akhil,
You mean you found dry joints? So what was your next move? Did you find any bulged e-caps?
Jestine
kasi
October 3, 2010 at 10:29 am
sir,
smps is ruuning but hard disk ,dvd drives are not getting the power.and aslo iam not getting the bios settings also .what is the reason for this one .tell me what can i do?rply to my mail ...
admin
October 4, 2010 at 8:20 am
Hi Kasi,
DVD is not getting power? Have you check the power supply cable? Make sure the power supply cables is connected to all the hardware in it.
Jestine
grage
October 8, 2010 at 11:21 am
I have a 20 pin SMPS. it is working fine in PC. So I tried to run it directly by shorting green and black wire, but it turns on for a moment only each time I shourt gree and black wire, as I can see the fan working. Please help me to turn it regularly.
thnx for any suggestions.
I is an old wintron pentium III PC with 140W SMPS.
The pin layout is standard as listed below:
Pin Color
1 Orange
2 Orange
3 Black
4 Red
5 Black
6 Red
7 Black
8 Gray
9 Purple
10 Yellow
11 Orange
12 Blue
13 Black
14 Green
15 Black
16 Black
17 Black
18 White
19 Red
20 Red
admin
October 9, 2010 at 5:00 am
HI Grage,
If you have connected to the motherboard and the fan still turn for a while and stop then this means the power supply itself have problem. You need to check if the filter cap inside have problem or not.
Jestine
grage
October 9, 2010 at 5:36 am
Thnx Jestine
The problem is solved now. SMPS turns on regularly by shorting green and black wire, either if I connect it to motherboard or connect any other load like HDD or CDROM.
So the problem is solved, but two new questions:
1. when I connected a 12volt DC motor to yellow and black wire to put a load on SMPS (in place of a HDD or CDROM) and shorted green and black wire again, but it did not turn on. So what is the problem with DC motor load.
2. someone suggested me to short green wire with red (or yellow) wire instead of putting a load. I works but I think this may damage SMPS in long term usages.
Please suggest me!! should I short green and red wires OR continue using a waste CDROM as load.
thnx again!!
admin
October 10, 2010 at 12:49 am
HI Grage,
Just short the green and black wire and connect to use cd rom, hdd or motherboard. Make your connection as simple as possible. The DC motor may draw to much or draw too low current thus the smps will not work.
Jestine
grage
October 10, 2010 at 3:43 am
Thnx Jestine
Bibhishan
October 14, 2010 at 5:50 am
sir, i'd like to know all iformation about SMPS,how it boot,how it supplies current to internal parts of computer
admin
October 14, 2010 at 8:24 am
HI Bibshisan,
I suggest that you visit this link:
http://en.wikipedia.org/wiki/Switched-mode_power_supply
Jestine
michael alonzo
October 23, 2010 at 4:27 am
good day sir i have a problem with my PC i dont know if my ATX power supply or my mother is bad its take a long time to start my PC its take 10 to 15 minutes to wait, what can i do to check my power supply if it's working properly...?
admin
October 23, 2010 at 4:52 am
Hi Michael,
You need to make sure the output voltages from the power supply are good and stable. If the output voltages are good then suspect a bad motherboard.
Jestine
thiyanesh
October 26, 2010 at 3:24 am
hi, our testing smps is connect to another board smps and short testing smpsgreen and black wired this time fan is run
admin
October 26, 2010 at 7:29 am
HI Thiyanesh,
Good to hear that!
Jestine
abdulsalam
November 10, 2010 at 1:11 am
smps still working. But mother board cmplaint occure after some days and repeat this.plese tell me is this problem come from smps malfunction.if it is then how can i check it
admin
November 10, 2010 at 9:20 am
HI Abdul,
If the smps is producing all the right output voltages then suspect a bad mainboard. The best to confirm is to get another good working smps to compare.
Jestine
raj
November 10, 2010 at 5:35 pm
Dear sir ,
I have Tc-400 atx power supply is not woking,when i was short pin ps_on and com .the fan was working fine.but i was connect to in to the sysytem not working.I was try with new ATX to the system its working fine.it means atx is some thing is wrong .please could u tell me how can i sort it out this problem.
admin
November 10, 2010 at 7:05 pm
HI Raj,
That means the smps can't withstand the load current draw. Try check the e-caps in it for bulged or high ESR value.
Jestine
jitendra upadhyay
November 11, 2010 at 2:24 am
Respected sir i have samsung lcd monitor model no synkmaster 710n as i switch on lcd it will switch on but at the same time power led goes off i check smps it giving out put voltage ok so guide me to procede further
thanks
jitendra upadhyay
dinesh
November 11, 2010 at 8:29 am
dear sir
i need mercury mother board model pl845glm.please details for mother connector to ip panel(cabinet)and photos details How connect io panel to mother board .replay my mail dineshmurali1@in.com
admin
November 11, 2010 at 10:09 am
HI Dinesh,
Sorry i do not have the information.
Jestine
admin
November 11, 2010 at 10:11 am
HI jitendra,
Try this link:
http://www.electronicrepairguide.com/testing-flyback-transformer.html
Jestine
ankur
November 15, 2010 at 3:16 am
hi sir , I have a 450w smps having over voltage problem . When I open the casing then i saw the bulged main filter capacitors and bulged secondary filter capacitors . I replaced them with new one but the over voltage problem is still there. loke 12vbecomes 14 5v is 6v. plz give me solution for it
admin
November 15, 2010 at 9:29 pm
HI Ankur,
Did you connect the power supply to load/motherboard to test it? Does this power supply use optoisolator IC? If yes then check the LED are side for any high ohm resistor. For your information, a bad output round coil also could cause the output voltage to increase.
Jestine
Yogesh Vishwakarma
November 24, 2010 at 1:41 am
how to connect fan (trow snps) in computer as an Exhaust fan
admin
November 24, 2010 at 11:02 am
HI Yogesh,
May i know what do you mean by trow snps?
Jestine
sam
November 27, 2010 at 4:29 am
Hello sir
i have a 250watt 20 pins smps.suddenly it has stopped working -after turning on my PC the CPU fan spins just 2/3 times.But when i connect another smps the pc is going OK!
Please sir give a solution to find out my problems...
admin
November 29, 2010 at 8:43 pm
Hi Sam,
You need to open up the power supply and check for bad filter capacitor at the output side. Test is with ESR meter.
Jestine
madhu
December 5, 2010 at 3:43 am
this is madhu sir i have a doubt in smps
once my friend told me i.e, he want to short the terminals of smps then it works
how is it possible and send the pin config to my email ID as early as possible
admin
December 5, 2010 at 11:16 am
HI Madhu,
The short is shown in the photo above.
Jestine
ankit
December 8, 2010 at 2:22 am
When you say fan rotate for a while.. Sir do you mean motherboard fan which is placed above my processor ?
Bcz dats what just happened with my pc.
But smpx fan is not rotating. Neither do my pc is getting switched on.
I have evn tried replacing it with new smpx.
admin
December 8, 2010 at 10:19 am
Hi Ankit,
I'm referring to the smps fan. If you have use other smps and it still does not work then the motherboard have problem.
Jestine
ilanthamizhan
December 10, 2010 at 6:22 am
how to check multi power suply in multi meter
admin
December 14, 2010 at 9:11 am
Hi Ilanthamizan,
You need to know how to test electronic components in order to repair the power supply. What is the complaint of the power supply?
Jestine