Don't Miss

Saving Computer SMPS – PART 4

By on May 13, 2023
atx power supply repair

As you might already know, I have a lot of interest in restoring computer ATX power supply, inspired by Jestine Yong’s famous book on SMPS repair. I do this as a totally free service to the hospital where I work. This hospital is not run aiming at commercial gains and I too wanted to be a part of their activities in this small way. Here are two more cases of such restorations.

  1. PRIYA 450W – Capacitors were found bulged in the secondary and the values of primary capacitors were out.

ho to fix atx power supply

I replaced all the electrolytic capacitors and retouched the board with fresh solder as usual.

The SMPS was back to do its service with better power! Loaded a 12V, 25W bulb and used the SMPS Tester for checking:

repair atx power supply

  1. FOXIN FPS-500S – Capacitors were found bulged and one exploded in the secondary side. The values of the tank capacitors were way out. There was burnt mark at the bottom of the coil, though coil was unaffected.

how to fix and repair atx power supplies

I replaced all the electrolytic capacitors and retouched the board with fresh solder and the SMPS worked very well.

I replaced the fan as it had developed cracks. Also scraped the black marks and cleaned to the extent possible.

fixing atx power supplies

Missions accomplished most satisfactorily and added to the collections!


This article was prepared for you by Parasuraman Subramanian from India. He is 72 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.

Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.

P.S-If you enjoyed reading this, click here to subscribe to my blog (free subscription). That way, you’ll never miss a post. You can also forward this website link to your friends and colleagues-thanks!

You may check on his previous article on Bulged Capacitors And Torn Speakers Found In HAIER LED TV Model LE32B7000



  1. Anwar Shiekh

    May 13, 2023 at 8:12 am

    that burn mark is scary

    • Parasuraman S

      May 13, 2023 at 10:39 am

      Yes, it is a bit scary! But it can be cleaned to a certain extent! Many thanks for your comments!

  2. Mark

    May 13, 2023 at 9:10 am

    Well done Parasuraman on generously providing such a necessary service for the hospital

    • Parasuraman S

      May 13, 2023 at 10:40 am

      Many thanks for your encouraging comments!

  3. Andrew F. Ali

    May 13, 2023 at 9:13 am

    Well done again!!!

    • Parasuraman S

      May 13, 2023 at 10:40 am

      Many thanks for your support!

  4. Waleed Rishmawi

    May 13, 2023 at 1:09 pm

    Great job on the repair and I am sure replacing all these capacitors brought you great joy lol. be blessed today as you are willing to bless others. have a blessed day my friend.

    • Parasuraman S

      May 13, 2023 at 8:48 pm

      Many thanks for your comments and blessings! Enjoyed!

  5. Albert van Bemmelen

    May 13, 2023 at 3:14 pm

    Another confident making repair article as you always make fixing defect smps units sound so easy after mostly just replacing some bad bulgy e-caps. And no doubt serving the public and fellow man doing good!

    • Parasuraman S

      May 13, 2023 at 8:49 pm

      Many thanks for your comments and encouragement.

  6. Yogesh Panchal

    May 17, 2023 at 11:03 pm

    Good Job! Sir

    • Parasuraman S

      May 18, 2023 at 9:19 am

      Many thanks, dear!


Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.