LED Driver Repaired
On the way to the home from my office I have got a call from my friend that his LED Light strip was stopped working with some kind of burning smell.so I request him to just handover the burned part to me as I was very tiered and he was convinced and he handed over the burned part to me.
It is LED driver (Power Unit). But there is no burn marks on upper body so smelled the unit I it is confirmed that smell is coming from inside only.so I have opened the unit for further checking.
This is component side and visual there is no burn mark on component side.
I have found burned trace on soldering side i.e. Mains Voltage 230V AC input section.
So now it is time for testing the components off line and find out culprit. Checked components one by one I found two diodes are open circuit.
Checked another components seems to be ok though I expecting some shorted components and suspected the IC but checked IC`S I did not found any shorted pins.
So I have replaced the diodes and soldered Jumper wire on burned trace.
Now for safer side I used series bulb for testing the unit I found positive result and checked out put voltage I am getting 20V DC.
So next day on the way to the my office I have visited my friends home and hand over the unit but as he was scared because of burnout smell he requested me to attached the unit in LED strip & check. So I did the fixing and turned on the supply and I found shine on LED strip as well on the face of my friend.
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
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Note: You can check his previous repair articles in the link below:
http://www.electronicsrepairfaq.com/lenovo-laptop-with-keyboard-key-problem-solved
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17 Comments
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Parasuraman Subramanian
June 10, 2019 at 9:48 pm
Looks like, you were off for sometime now! Good job and informative article with a friendly support ensured in the process! Double ponged effect!
Yogesh Panchal
June 11, 2019 at 3:55 pm
Yes Sir,
I have took some CCTV installation and maintenance contract at various location so busy with that.
Albert van Bemmelen
June 10, 2019 at 9:56 pm
Good job! But strange that there was no fuse on the primary mains input side. Since the copper track acted as fuse and you now used a thick wire the current can grow in case of next time a shorting diode plays up. And fuses are mandatory to prevent fires.
Yogesh Panchal
June 11, 2019 at 4:07 pm
you are right Albert,
In branded Laptop adapters Most of the time i found same type of fault. there is some shorted or open circuit component with burned traces on primary side but fuse is intact.
Robert Calk Jr.
June 11, 2019 at 12:12 am
Good job, Yogesh!
Yogesh Panchal
June 11, 2019 at 4:08 pm
Thank you sir.
Mark
June 11, 2019 at 6:18 am
Good job Yogesh!
Moniem
June 11, 2019 at 9:01 am
Good job
Yogesh Panchal
June 11, 2019 at 4:09 pm
Thanks ,Mark
Yogesh Panchal
June 11, 2019 at 4:10 pm
Thank you! Sir
Ghashaan
June 11, 2019 at 10:00 am
Good job!
beh
June 11, 2019 at 3:51 pm
Well done YOGESH and thanks.
Yogesh Panchal
June 11, 2019 at 4:11 pm
Thank you! Ghashaan
GIFT ELIJAH ELIJAH
June 12, 2019 at 8:17 am
Very good job with an elaborate explanation. Well done.
James
June 19, 2019 at 6:48 pm
Good job, Yogesh!
The use of a thin PCB trace as fuse (to save cost) is a very common practice in CFL bulbs and LED Drivers etc.. Suggest you to add a fuse to the repaired LED Driver so that it will not cause a fire to your friend's house if the driver encounter a short circuit a second time.
Yogesh Panchal
June 22, 2019 at 4:14 pm
Thanks James!
Hagos Alema
April 26, 2020 at 6:49 pm
i want to repair electronic equipment