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How To Repair Foxin ATX Power Supplies

By on April 16, 2018
how to fix and repair atx power supply











repair atx power supply

This SMPS was brought to me with the complaint that it was dead. As usual, first thing is to open and do a thorough cleaning, which I did. Dismantled and saw a lot of damages that have taken place in the board!  I saw transistors, resistors burst and burnt.  I saw tracks burnt!

how to fix atx power supply


Found another transistor, opto-coupler and diodes short!


Replaced all these components and did a thorough dry solder patch up. I did not find any Electrolytic Capacitor out of ESR.

Replaced the fuse, even though it was not blown (?) as advised and cautioned by seniors in this forum earlier.

atx power supplies repair

Connected the power through a series bulb and found it to be working perfectly well. The voltages were also measured for accuracy.

Fit it back to its case and after thorough ‘soaking test’, gave it to the customer.

power supply repair

Another attempt of the ‘dump devil’ stumped, and added to my list of satisfactory services!

This article was prepared for you by Parasuraman Subramanian from India. He is 68 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 repair article below:




  1. Robert Calk

    April 16, 2018 at 8:41 pm

    Good job, Parasuraman. We sure don't want to feed the dump devil!

  2. Suranga Electronics

    April 17, 2018 at 12:51 am

    Well done Mr Parasuraman.
    Good Repair and Good Fault Finding.

  3. HAKAN

    April 17, 2018 at 3:03 am

    Hi,you connected one tip of light bulb to AC line in series with power supply,is it right?couldn't you connect power supply to AC line; why did you use this light bulb?

  4. Gustavo Contreras

    April 17, 2018 at 9:01 am

    Good work!! But what is the idea of changing the fuse if this is OK?
    Maybe it could be debilitated, more fragile?

    Best regards,

  5. Parasuraman

    April 17, 2018 at 4:18 pm

    Please read Jestine Yong's world famous book on SMPS repair.

  6. Paul

    April 18, 2018 at 1:50 am

    Its a better idea mrParasuraman Subramanian

    Thank you

  7. Albert

    April 18, 2018 at 7:53 am

    At first glance a repair without any decent chance of fixing it. But with your skill and professional care you again managed to finish the job! Even when this time no e-caps were involved to replace (LOL).

  8. Henrique Jorge Guimarães Ulbrich

    April 20, 2018 at 12:10 am

    By sure, a different maintenance. No ESR out; a lot of components dead, and the fuse was not blown (?). And the gadget worked just after the first power-up. And better: according to your report, it was a quick maintenance. Greetings.

  9. Charles

    April 20, 2018 at 4:49 am

    Good job well done sir for saving the enviroment!

  10. Yogesh Panchal

    April 21, 2018 at 10:36 pm

    Good Job! Sir.

  11. Temitope

    May 12, 2018 at 10:48 pm

    Sir, I will love to get feedbacks and replies from you. Have you any publication on vaccum tube technology? There is this method you always describe about you connecting a bulb in series to confirm the operation of a fixed device, I wish there is a YouTube link where it is well explained. I'm yet to understand that method. you can reach me on



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