Capacitors Found Bulged In Enhance SMPS
MODEL AND MAKE: Enhance make Small SMPS Model No.SFX-200D
COMPLAINT REPORTED: Dead
HISTORY: This belonged to the hospital where I work. Since there is lock down due to covid-19 pandemic, I am working from home. This was one of the three SMPS received for repair.
TROUBLESHOOTING AND RECTIFICATION DONE: As the computer maintenance-in-charge had already done opening the unit and cleaning, I could save sometime. Removed the PCB and did rest of the cleaning. Saw three 1000/mfd capacitors bulged. So replaced these. Checked ESR of all the caps on the main board and additional horizontally fit control board. Replaced three more caps that showed very high ESR readings found in the Control Board, which I had to remove for easy access and checking. Did a thorough dry solder touch up on the entire board. After checking and ensuring that there were no other defective components, soldered the control board back. Shorted the green and black wire in the connector, as advised by Jestine Yong, in his world famous SMPS repair book (https://powersupplyrepairguide.com). Opened the cap of SMPS Fan and applied a couple of drops of oil, as I found it to be a bit hard to turn. The grease inside these fans tends to get hardened and applying a few drops of oil would make it run smoothly. Applied power and found the Fan working normally without any sound. Checked voltages and found these also were normal. Allowed it to run by loading a 12V – 25W Bulb for some time. Then fixed the board back to the case. Mission accomplished and satisfaction got added to its collection.
NOW HERE ARE A FEW PICTURES FOR OUR ELECTRONIC EXPERTS:
This article was prepared for you by Parasuraman Subramanian from India. He is 70 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:
https://jestineyong.com/computer-motherboard-restored-after-its-vga-connector-got-ripped-off/
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Albert van Bemmelen
October 15, 2020 at 7:25 pm
Besides replacing e-caps it indeed gets harder to fix these power supplies with new unknown and hard to find controllers and special IC's. And not being able to find any schematics or matching datasheet makes it even harder! So good job fixing this unit with unknown controller IC's on its board.
Parasuraman S
October 16, 2020 at 2:39 pm
Many thanks for your encouraging comments!
Waleed Rishmawi
October 15, 2020 at 7:47 pm
I did not know that you work in a hospital. I bet there are lots of equipment to repair and maintain. Enjoy. Good job on the repair
Parasuraman S
October 16, 2020 at 2:43 pm
I am a consulting Manager, Purchase and IT. Its a special privilege hospital has allowed to me on my own request to find a free time fill up. I am not a regular biotechnician doing all the repair work there. There is a team already there to do that. SMPS is passed on to me almost all the time.
Many thanks for your comments!
Henrique J. G. Ulbrich
October 16, 2020 at 12:51 am
Another quick and efficient repair. Very good, Parasuraman
Parasuraman S
October 16, 2020 at 2:43 pm
Many thanks!
Joshua Oloo
October 17, 2020 at 5:09 am
Thanks for the Article.please indicate the working voltages of the three replaced caps for the benefit of those not using ESR.Thanks
Parasuraman S
October 17, 2020 at 5:38 pm
The picture of the defective caps would show that these are rated 16V, 6.3V and 50V. I replaced with 25V, 25V and 63V caps in its places. Thanks!