Saving Computer SMPS Part – 9
These two Computer SMPS belonged to the hospital where I work and was brought to me in dead condition. Preliminary cleaning was already done by the IT Administrator saving that work for me.
Case (1) Zebronics-ZEB-N450W : The following pictures are self-explanatory and it would give you all an idea of dry solder joints on the board:
As usual, when I checked the ESR of caps and its values, these were way out and I replaced all of them on the board and retouched the board thoroughly, cleaned and checked for any man-made shorts.
As I could not find any and felt very satisfied with my job, I applied power, connecting its SMPS fan, which I had already lubricated, a 25W 12V bulb as load and my ATX tester. I was very glad to see the result, which I am sharing below:
You can have a look at the values of the tank capacitors, as a proof of my statement:
Case (2) FOXIN-FPS500C : In this, I found one 470uF/16V capacitor bulged. As I had already done a work on this long back, the board was good with solder joints intact. Nevertheless, I replaced all the electrolytic capacitors except the tank capacitors, which were replaced during my last service and found to be ok.
The SMPS fan was found hard to rotate and I lubricated it peeling the label in the centre and the locking cap. Then I re-fixed the cap and label as how it was before.
Then when I applied power, in the same way as explained above, the SMPS was found working very well.
Missions accomplished with double satisfactions getting collected with pride!
This article was prepared for you by Parasuraman Subramanian from India. He is 74 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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Albert van Bemmelen
July 20, 2024 at 1:18 pm
As soon as they make replacing those e-caps as easy as simply plug-and-play on easy press-fit insertion sockets you will have a much easier job dear Parasuraman! Or maybe even e-caps that are simply screw-in-able in a socket. It wouldn't be impossible since all those e-caps are always round and mostly standing up anyway!
Parasuraman S
July 20, 2024 at 5:45 pm
Ha! Ha! Enjoyed the fun and pun! Many thanks, dear!
Yogesh Panchal
July 20, 2024 at 4:05 pm
Good Job! Sir
Parasuraman S
July 20, 2024 at 5:47 pm
Many thanks!
Mark J
July 21, 2024 at 4:25 am
Nice job....
Parasuraman S
July 21, 2024 at 12:34 pm
Many thanks!
Waleed Rishmawi
July 22, 2024 at 2:47 pm
I sure you had fun working on these devices since you replaced all these capacitors..LOL. love it. thanks for sharing and have a blessed day
Parasuraman S
July 23, 2024 at 4:54 pm
Yes, my first motivation is replacing caps! (LOL) Many thanks for your loving comments, dear friend!