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No Power In ATX Power Supply Solved

By on June 30, 2013

My friend brought to me his work computer power supply to fix it. When I test the power supply it didn’t work, I mean the fan didn’t rotate.

atx servicing

At this moment, i began open the cover of the power supply, i found a burnt area as shown below . I noticed two open tracks and leaked capacitor with a value 1000uf/10volt.

atx troubleshooting

First I brought my digital Meter and select the buzzer position and test the surrounded components, i found all components were ok except a shorted diode. After i replaced the diode and the capacitor and soldering the open tracks by wires as shown below :

burnt atxSorry the photo a bit blur

I connect the power but before i connect the ps_on to ground, I checked the voltage on ps_on which been 4.19 volt as shown below then i connect the ps_on to ground, the power supply back to life. The fan worked well.

atx repairing

I checked the output voltages and all were within range.

5v = 5.27v

3.3v =  3.28v

12 v = 11.85v

-12v = -11.34v

atx repair

This article was prepared for you by Engineer Mohammed Saad from Egypt. Please give a support by clicking  on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.

By the way if you have any good repair article that you want me to publish in this blog please do contact me HERE.



  1. beh

    June 30, 2013 at 11:48 pm

    thanks for sharing your repair with us.

    • Mohammed saad

      July 1, 2013 at 4:03 pm

      Hi Beh,
      thanks for your reply, i hope to have a benefit.

  2. Waleed Rishmawi

    July 3, 2013 at 5:31 pm

    good job on this repair. keep up the good work

  3. Mohammed Saad

    July 8, 2013 at 2:34 am

    Thanks very much Waleed.

    • Mubashir

      July 16, 2013 at 8:58 pm

      Dear Saad, AOA

      Good job. I want to ask that I have Compaq Power supply but it is still dead. This different than ATX power supply. Have you worked on it. Kindly help me to repair this kind of power supply.


      Karachi, Pakistan

      • Jestine Yong

        July 17, 2013 at 7:56 pm

        HI Mubashir,

        Sorry perhaps never came across before because there are hundreds of Compaq model in the market. What was the problem and what have you checked?


  4. Ravi

    September 20, 2013 at 9:24 pm

    Hi Mr.Jestine It is a great thing you are doing by publishing informatic tips from allover the world along with your master articles. Anyway i appreciate your selfless and whole hearted endeviour. Keep it up sir.
    Also wish to thank Mr.Saad
    Ravi/Kerala/ India

    • Jestine Yong

      September 21, 2013 at 10:23 am

      HI Ravi,

      You are welcome!



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