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Three CCTV SMPS Saved From Dump

By on September 30, 2023







These three SMPS were brought by a CCTV service provider in a dead condition.

Case (1) Model CP-DPS-MD100-12D

cctv smps repair

As you can see, the capacitors in the output area were bulged. I checked the SMPS transformer with the Ring tester, which showed healthy. Looked for any burnt or other defective components in the primary and secondary and did not find any.

So, replaced all the electrolytic capacitors, retouched the board and cleaned it. Then applied power with a load of 12V/25W bulb. It worked very well.

how to repair and fix cctv

Case (2) Model JBN1205

fixing cctv

After checking and ensuring that the primary and secondary was ok like before, I replaced all the electrolytic capacitors, retouched the board thoroughly and cleaned it using IPA as usual.

Then applied power to see that it worked very well:

repairing cctv power supply

Case (3) Model Kenson IC S-120-12

repair cctv power supply

In this SMPS, I found both switching transistors short, Fuse blown, diodes short and the capacitors were bulged. After removing all defective components, when I checked the SMPS using Ring Tester, it showed healthy. So, I replaced them, retouched the board and cleaned it thoroughly using IPA. Then it was found working very well.

how to fix a broken cctv

troubleshooting cctv no power smps

Thus, these three ‘musketeers’ were back to the field for protecting and support!

Missions accomplished very well and added to the collection bag one after another.


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 Restored A Dropped And Neglected BANG & OLUFSEN Set Model BEOCENTER 7700




  1. Anwar Yunas Shiekh

    September 30, 2023 at 9:09 am

    Another fine job

    • Parasuraman S

      September 30, 2023 at 10:54 pm

      Many thanks, dear!

  2. Waleed Rishmawi

    September 30, 2023 at 1:41 pm

    good job my friend. I am sure you had fun replacing these capacitors. LOL. thanks for sharing and have a blessed day

    • Parasuraman S

      September 30, 2023 at 10:55 pm

      Yes, of-course! Many thanks, dear!

  3. Albert van Bemmelen

    September 30, 2023 at 4:36 pm

    You always make fixing smps units look so easy even when it mostly isn't! Especially in this 3 in 1 go repair article!

    • Parasuraman S

      September 30, 2023 at 10:55 pm

      Many thanks for your comments and encouragement!

  4. Yogesh Panchal

    October 5, 2023 at 12:25 am

    Good Job! Sir

    • Parasuraman S

      October 6, 2023 at 12:33 pm

      Many thanks!


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