A Blinking LED Light Repaired And Maintained
As I was visiting my niece and her husband at their house, I noticed a nice looking light attached to the ceiling but it was not on. I asked my niece about it and she said it does not work because it keeps blinking and it is irritating to us so we keep it off all the time. So I offered to help out.
The next day her husband brought the light to my shop for repair; I went ahead to see what is causing the light to blink.
From experience, usually when a LED light blinks it has to do with bad capacitors in the power supply or simply one of the tiny LED lights is about to burn so it blinks and takes the whole system with it.
With my LED tester I tested the first Y side of the lights and they all came on but when I tested the X side of the lights, it did not come on.
I powered on the power supply without the light attached to it, there was a buzzing sound coming out of the power supply.
With the help of the ESR meter I found two bad caps and I replaced them with new ones.
These were 2.2 UF/50 volts each and once I got them installed on that board, the buzzing was gone but now I hear sparks and smelled something burning.
This pin that connects to the X side of the LEDS was loose causing sparks so I re-soldered that pin and tests it out but this time there was no buzzing and no sparking but the LEDs did not come on.
I tested it again with my LED light tester and one of the LEDs burnt out and I could see a tiny black dot in the center of it. I replaced it with a jumper wire and tested the device; all the lights came on and it was bright.
So I took the jumper off and soldered a new LED light in there, not the best soldering but it did the job. Take a look
Mission Accomplished.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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Note: You can check his previous repair articles in the link below:
https://jestineyong.com/shorted-mosfet-23n50e/
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Brian Fields
May 17, 2021 at 5:16 pm
While this wasn't a particularly complicated circuit, you demonstrated a very logical,step by step approach to resolving the issue. Thanks for a good example of fault finding.
Waleed Rishmawi
May 17, 2021 at 7:59 pm
Brian: I thank you and appreciate your comments. have a blessed day
Albert van Bemmelen
May 17, 2021 at 5:38 pm
Good service and nice that you were able to help family! It indeed can be most disturbing having to look at a constantly blinking light.
Parasuraman S
May 17, 2021 at 7:58 pm
A close family was brought closer! Good job there!
Waleed Rishmawi
May 17, 2021 at 8:00 pm
Albert: thank you my friend. I appreciate your comment and have a blessed day
adir figueiredo
May 17, 2021 at 8:35 pm
qual o tipo de LED você usou
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what type of LED did you use
Waleed Rishmawi
May 19, 2021 at 3:25 pm
Adir: I took it off a same LED light set that I have in the shop so it was a prefect match. have a blessed day
Paul Preston
May 17, 2021 at 10:52 pm
Your LED tester, was it store bought or did you make one in the shop?
Waleed Rishmawi
May 19, 2021 at 3:26 pm
Paul: you can not find meters like that in store..only online. have a good day
Michael G
May 18, 2021 at 1:02 am
Good job, your persistence paid off! It’s always disappointing when you find bad capacitors and think the problem is resolved then you replace them and it gets worse (smoking). Anyway, I’m sure your niece and family are happy.
Waleed Rishmawi
May 19, 2021 at 3:27 pm
Michael: thanks. the smoke was because of loose wire not because of the capacitors. they were happy to get that fixed. have a blessed day