Saving Computer ATX SMPS Power Supplies – PART 2
A couple of Foxin SMPS ATX power supplies were also saved from dump with peculiar problems noticed
- 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.
After retouching the board and replacing all the electrolytic caps,
and cleaning the board thoroughly, it worked perfectly well on a 12V, 25W load.
- FOXIN F500C : This was dead and on checkup, I found that capacitors were bulged.
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.
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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