Saving Computer SMPS Part-6
These TWO SMPS belonged to the hospital, where I worked. Both were brought in totally dead condition, but opened and cleaned by the IT maintenance staff, saving my time.
Case (1) Zebronics ZEB-N450W : The capacitors were found bulged. I removed the tank capacitors and found the following reading: (470uF was just 212.9uF)
Replaced all the electrolytic capacitors and retouched the boards with fresh solder, cleaned and lubricated the fan.
When I applied power with a 12V/25W bulb as load, the outputs were found to be ok.
Case (2) Zebronics ZEB-ML450W:
The story was different in this. It was a case of dry solder. But when I checked up the capacitors, the values were totally out and therefore I chose my enthusiastic work of replacing all of them. After finishing the work and retouching the board thoroughly, I fit large sized tank capacitors for the sake of testing as I was not having the short sized caps in stock, which I ordered online.
The short sized caps came later, which I fit side by side and accommodated it in the same place. The outputs were ok like before with the same load. Let us see the pictures now.
Missions accomplished and satisfactions in multiples got collected.
These two were yet another free of charge service to the great hospital in my home town, run by able, dedicated and committed management.
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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12 Comments
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Anwar Shiekh
December 2, 2023 at 11:18 am
Never heard of that make of capacitor
Parasuraman S
December 2, 2023 at 1:03 pm
There are millions of brands made in China! Many thanks for your comments!
Waleed Rishmawi
December 2, 2023 at 2:45 pm
ah, the joy and satisfaction of replacing capacitors... and as always, good professional repiar..keep up the good work my friend and have a blessed day
Parasuraman S
December 2, 2023 at 10:36 pm
Many thanks for your comments and encouragement, dear!
Albert van Bemmelen
December 2, 2023 at 4:16 pm
If you were a doctor dear Parasuraman, no patient would die (Lol)!
Parasuraman S
December 2, 2023 at 10:38 pm
Vow! That was a unique compliment, dear! Many thanks!
Yogesh Panchal
December 2, 2023 at 10:11 pm
Good Job! Sir,
look like all caps surrendered...Ha ha....
Parasuraman S
December 3, 2023 at 12:34 pm
HA! HA! Many thanks dear!
Babu M S
December 2, 2023 at 11:32 pm
Sir,Your doctor for smps in this case, your not allowed to die the smps. Thank you very much for sharing.
Parasuraman S
December 3, 2023 at 12:35 pm
Many thanks for your wonderful comments and encouragement, dear!
Imoudu.O
December 3, 2023 at 1:50 am
I guess that cap passed esr test- .21 but failed capacitance test.One can't totally rely on esr test.Thanks for sharing sir.
Parasuraman S
December 3, 2023 at 12:36 pm
Yes, some will show ESR ok, but will fail in capacitance test. Many thanks for your comments, dear!