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Burst Capacitor And Dry Solder Found In FOXIN Computer ATX MODEL FPS500S

By on July 9, 2021
how to repair atx power supply







atx fixing

This is one among the five Computer SMPS brought from the hospital for repair. As the cleaning was already done by the staff there, I straightaway investigated the reasons for its failure. Found a cap bulgy and dry solders all around. A couple of components were found to be rusted too, which cleared up on cleaning with IPA.

atx power supply circuit board repair

The SMPS fan did not rotate even when I tried hard. It was stuck like cemented. Any amount of lubrication also did not free it necessitating a replacement.

I checked the two tank capacitors and found the values were way out. So, replaced all the electrolytic capacitors on the board, before I did the complete retouch of the board with fresh solder.

sigma tweezers check on components

The SMPS was found to be working very well on test.

atx power supply tester

I am sure some of you at least might wonder why am I doing servicing these SMPS, as new replacements were available at economic rates. Well, in this way, I am not only saving a lot of money for the hospital, but also preventing large pile up of E-Waste. The cost of repair is confined only to the cost of components as my service is free to this hospital.

No need to say that mission got accomplished again and satisfaction found its way very easily to its collection place.

To conclude the article, here is a picture of all the components replaced in this SMPS ATX. The fan was retrieved from an old discarded ‘beyond repair’ SMPS (control IC not available for replacement).

bad capacitors replacement

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 Sony DVD Player Repair




  1. Albert van Bemmelen

    July 9, 2021 at 1:12 pm

    Although you again was fully able preventing the units from going 'E-wasted', the many bad e-caps and other bad parts of course were still added to that pile no less. And the many quickly going bad electrolyte capacitors sadly never are going to change that.

    • Paris Azis

      July 9, 2021 at 3:16 pm

      Sadly enough this is indeed true Albert! Taking also in account that Parasuraman's reference about the cheap price of these power supplies,which is also a true counter motivation for repairs, I always prefer to exploit every component to the limit of their operational life, instead of performing any wholesale replacements of them.
      Of course, talking about e-caps especially, when the component reaches the "red" zone its replacement should be considered as obligatory.
      Nevertheless,any successful repair reduces the e-waste pile in a certain degree, depending upon the repair strategy...
      The environment suffers mainly because of lack of ANY attempt for repairing electronic equipment (and not only that...), due to various and many, more or less known reasons, with cheapness of buying new equipment being the number one in the relevant list...But it seems that this will not last for long, the proof being the high rate of increasing prices lately, due, again, in various reasons, with overtaxing being the leading one...

      • Albert van Bemmelen

        July 9, 2021 at 9:23 pm

        Indeed getting new replacement parts no longer is a cheap economical option since starting from 1 July 2021 the EU puts these very huge sanctions on imported products by charging high extra taxes and handling costs plus import fees. Which completely destroys my fun in electronics as an affordable hobby. And 'mining' spare electronic parts from old boards and keeping a lot of spare parts in stock is now the only good option that is left! These absurd taxes only help the already well paid men and women in Brussels, and their absurd constantly moving to strasbourg, and it probably will crash the Euro until it is no longer worth anything. We already see many alarming signs of this.
        Politics is also mostly done by people without any degree in science or technology studies. Which in my opinion makes their ruling most of the time worse!

        • De luka

          July 11, 2021 at 8:53 pm

          Hello dear Albert van Bemmelen,

          I have another opinion about new import taxes in the EU. I believe it's a very good decision because it is created to stop importing waste to the EU. Surveys show that most Chinese products imported are very bad quality products, that is bad for human health and most often break almost instantly, so the EU is full of Chinese crap. Replacement parts shouldn't become more expensive because there are already Chinese warehouses around EU to evade tax and there are plenty of parts made in Poland, Germany and etc.

          • Parasuraman Subramanian

            July 13, 2021 at 9:50 am

            Very correct!

      • Chesco mwandosha

        July 9, 2021 at 9:44 pm

        How can i get ?and how much

      • Parasuraman S

        July 9, 2021 at 11:41 pm

        Many thanks for your comments!

    • Parasuraman S

      July 9, 2021 at 11:40 pm

      Yes, agreed. These capacitors will not take so much room and as complicated as the entire unit for disposal! Many thanks for your comments!

  2. Otavio Lima

    July 9, 2021 at 7:46 pm

    I'm Brazilian and I also do this type of service here in my city. I believe I contribute to the environment by fixing ATX Power Supply (and others). Congratulations for the initiative.

    • Parasuraman S

      July 9, 2021 at 11:42 pm

      Many thanks for your comments!

  3. Anwar Y Shiekh

    July 9, 2021 at 11:29 pm

    Was wondering which capacitors you feel are a worthy replacement in a power supply.

    • Parasuraman S

      July 10, 2021 at 11:02 pm

      It depends on the condition of the capacitor. As long as the cost of replacement does not become prohibitive vis-à-vis the price of a new device of same configuration, we can go ahead! Many thanks for your comments!

  4. Arunkant L Pandit

    July 10, 2021 at 3:07 pm

    You are giving back to society by doing this selfless service to hospital gadgets,besides reducing e-waste.Good job Sir. Have blessed day.

    • Parasuraman S

      July 10, 2021 at 11:02 pm

      Many thanks for your comments!

  5. Geoffrey Wight

    July 10, 2021 at 9:44 pm

    You nailed it again! I am glad to see someone with talent and a heart giving freely to this world. Less waste, more Parasuraman S!

    • Parasuraman S

      July 10, 2021 at 11:03 pm

      Many thanks for your comments!

  6. Yogesh Panchal

    July 13, 2021 at 5:45 pm

    Good job! Sir
    In this pandemic & various countries trade and taxation policies only way out is to Salvage components form unrepaired equipments. i.e Micro Switches /MOSFET /IC's /Transformers/Diodes/transistors /capacitors and many more......

  7. Humberto

    July 13, 2021 at 10:03 pm

    I´ve really enjoyed reading this article. Congrats.


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