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Saving Computer ATX SMPS Power Supplies – PART 2

By on September 24, 2022
how to repair atx power supply








A couple of Foxin SMPS ATX power supplies were also saved from dump with peculiar problems noticed

  1. FOXIN F500S : This was brought to me with the complaint that it did not take the load. On checking, I found that there were dry solders on the board and the two tank capacitors were dried out. ESR of other caps also was out. One jumper wire and one disk capacitor was found rusted. The rust formations in other components went off after cleaning with IPA.

how to fix a broken atx power supply

fixing power supply atx

After retouching the board and replacing all the electrolytic caps,


and cleaning the board thoroughly, it worked perfectly well on a 12V, 25W load.

bulged capacitor replaced

  1. FOXIN F500C : This was dead and on checkup, I found that capacitors were bulged.

testing atx power supply after repair

After replacing all the electrolytic caps including the Tank capacitors, as the values were lower and retouching the board thoroughly, the SMPS came back to life.

I had to use a 250V cap in place of 200V and the sizes were larger. So, I bent them slightly slanting to accommodate.

how to fix and repair atx power supplies

More and more collection of satisfaction is the only reward that serves as fuel to propel forward and in this case, double satisfaction got into the bag.

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.

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You may check on his previous article on Replacement Of Edge LED In Panasonic TH40C400D




  1. Anwar Shiekh

    September 24, 2022 at 10:08 pm

    Those replacement primary capacitors make me nervous

    • Parasuraman S

      September 25, 2022 at 5:24 pm

      I wonder why?

  2. Waleed Rishmawi

    September 24, 2022 at 10:34 pm

    Another power supply up and running. It seems you have a lot of capacitors stored in your workshop. Thanks for sharing and have a blessed day

    • Parasuraman S

      September 25, 2022 at 5:25 pm

      Yes, I have plenty of capacitors in store. Many thanks for your comments!


    September 25, 2022 at 12:02 am

    Thanks for sharing, satisfaction surely must go into the bag you are doing a very good job for your customers. Changing the caps gives the equipment more life.

    • Parasuraman S

      September 25, 2022 at 5:25 pm

      Many thanks for your comments!

  4. Albert van Bemmelen

    September 25, 2022 at 3:16 am

    I already read part1 but almost didn't notice part2. You sure have been very busy doing free services for the hospital! I hope that all the 'sick' bad e-caps you have replaced are nevertheless somehow compensated for (lol).

    • Parasuraman S

      September 25, 2022 at 5:26 pm

      Ha! Ha! Many thanks for your comments!

  5. Raj

    September 25, 2022 at 11:05 am

    Great job. thanks much for sharing

    • Parasuraman S

      September 25, 2022 at 5:26 pm

      Many thanks for your comments!

  6. Yogesh Panchal

    September 26, 2022 at 7:05 pm

    Good Job! Sir

    • Parasuraman S

      September 26, 2022 at 11:05 pm

      Many thanks for your comments!

  7. Lynn Blakely

    October 3, 2022 at 7:06 am

    Parasuraman: Thanks for another good article to give you the satisfaction of doing a good repair.

  8. megan

    September 8, 2023 at 3:55 am

    sir, mine is the same zebronics 450wats , i would like to keep some of its components as spare just incase . on primary side i have these transistors - 208 c5027r 13007 0706 13007 1012b
    on secondary output side - these swtiching diodes
    stpr1620ct 7skwy u phl 430 stps2045ct 7sabz vw phl 009 stps2045ctc g417b vw chn 236
    where can i get these or equivalents in india online , i try to find some , but mostly they are abroad and expensive in shipping , and aliexpress is banned here.


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