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
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: