Lightning Tore Off Tracks In CCTV SMPS ERD-AD22
This SMPS was brought to me by a friend involved in CCTV supply, installation and maintenance. Though our acquaintance began from the Hospital where I work, this developed into a friendship, especially after he did the CCTV installation in my house. With a lot of costly sets lying around, many of which are antique type and could not be replaced, I did not want to take the risk of leaving the house without vigilance.
On opening the device for cleaning, I was taken aback to see that the bottom cover was having dark marks, and the tracks at a few places were torn due to lightning. Fuse, Bridge Rectifier, tank capacitor and the Off-line Switcher, LNK6666E were all found dead short. One PTC at the output was found torn apart.
After removing these shorted components, I did a ring test and found that the SMPS transformer was unaffected. All components in the secondary, except one PTC were ok.
So, I went ahead and replaced all the defective components and the electrolytic capacitors. Powered the device through a Serial Bulb and found it to be working still and it had survived!
As the typical disk type PTC was not available in the market, I used a jumper to close the circuit.
Mission accomplished to bring smiles on both me and the customer, and to shove in satisfaction to the collection.
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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Albert van Bemmelen
October 21, 2023 at 1:07 pm
Thanks for sharing this smps repair with LNK6666E : Energy Efficient High-Power Off-Line Switcher With Accurate Primary-Side Regulation (PSR) from Power Integrations Inc. Of which a datasheet easily could be found.
Sorry to hear that these overvoltage protective PTC disk type components are not available in your country, which must be a problem for CCTV firms who install these units too?
Parasuraman S
October 21, 2023 at 11:19 pm
I have rarely seen these type of PTCs. Many thanks for your expert comments!
Waleed Rishmawi
October 21, 2023 at 6:45 pm
Used a jumper instead of a PTC? That does not sound good. Have a blessed day
Parasuraman S
October 21, 2023 at 11:20 pm
Well, I had no other go! Many thanks for your comments!
Yogesh Panchal
October 25, 2023 at 4:15 pm
Good Job! Sir
Parasuraman S
October 25, 2023 at 10:57 pm
Many thanks!