New ‘Clickon’ Emergency LED Light With Battery Management IC Goes Dead
This is a new emergency LED light, Clikon CK5060 brought from abroad picked up by me from a close friend’s house, when I visited them. The complaint was though the charging green light was on; the emergency light does not work.
In Kerala, where there is constant power supply failure and problems, especially during monsoon season, having a ‘working’ Emergency Light in the home is a must. Falling of trees on main lines, which are overhead, is a regular phenomenon and many times when it happens in the night, the power would be restored only on the next day morning!
I brought it home and opened it to study what can go wrong so quickly on this light which shows up quality in finish at least, though the brand was not familiar to me. The circuit board was different from what I have seen in Emergency Lights before. This had an SMPS, with provision for 12V DC input from any adaptor, LM358 for battery management and so on, and it looked like a professional design with very neat layout. The PWM was OB2512NJP, the datasheet of which could not be seen.
After studying the circuit and checking it on mains as well as through external 12V DC source, I noticed that the charging voltage was not present at the battery terminals. Tracing the track, I observed one fuse that looked like a square capacitor, on the positive rail, which was found open. It was showing 2A on its top.
Replaced it with a round one that I had, which I had procured from Aliexpress, when a similar fuse was required for servicing an LCD Monitor.
Checked and found the light working perfectly well in all modes.
So, fit it back in its case, charged it well and returned it to my friend, who was very happy! So, the satisfaction list grew further!
This article was prepared for you by Parasuraman Subramanian from India. He is 69 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/shorted-mosfets-and-bad-capacitors-in-amplifier/
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Robert Calk Jr.
September 28, 2018 at 12:58 pm
Good job, Parasuraman. I couldn't make out anything from the photos but the PWM IC may be compatible with this one. It is a PWM DC/DC converter. http://www.analog.com/media/en/technical-documentation/data-sheets/1949f.pdf
Albert van Bemmelen
September 28, 2018 at 2:01 pm
Good job on fixing this emergency light Parasuraman! The question why a new T2A fuse refuses (grammar joke LOL) suddenly working remains though?
And good job for finding the datasheet if they are the same Robert!
Robert Calk Jr.
October 2, 2018 at 9:44 am
Thanks Albert. It would help if we had some better photos to work with. The people that claim to see Bigfoot still show photos that look like they were taken in 1970...lol
Andre Gopee
September 28, 2018 at 9:07 pm
Nice Job Parasuraman.
`Humberto
October 3, 2018 at 1:50 am
Good repair of this Emergency LED-light.