A Dead Microscope LED Light Bank Was Brought Back To Life
A fellow technician brought a dead LED light bank for repair. It was a very low quality LED lights. He bought it two weeks ago and as he tried to power it on, he heard a tiny blow sound coming from inside the device and it did not turn on.
Four screws to come off and I were able to take this device apart.
This is powered through a 220 AC volts and it does not have any external power supply.
It was very easy to take it apart and when I powered on the device, the LED light were flickering on and off for seconds (sorry I could not capture this on camera).
As I did my regular testing, the tiny blow that the customer talked about was my clue. The resistor that you see in the photo was used as a fuse and there was a hole in it. I tested for any shorts on board like the diodes and nearby components I found none.
As I replaced that resistor fuse with a good one, the lights came on but were still flicking on and off but this time it was doing it the whole time.
So I got my ESR meter out and started checking the capacitors on board. I found two bad ones. Once I replaced these bad capacitors…well, 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/an-air-condition-power-board-repair/
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Yogesh Panchal
August 31, 2020 at 2:16 pm
Excellent! Waleed
Waleed Rishmawi
August 31, 2020 at 6:12 pm
Yogesh. Thanks man
Parasuraman S
August 31, 2020 at 3:32 pm
Excellent is the only word that suits your deeds!
Waleed Rishmawi
August 31, 2020 at 6:12 pm
Parasuraman: thanks man . I appreciate it very much
Albert van Bemmelen
August 31, 2020 at 8:47 pm
And there was light my friend! Thanks for not keeping us in the dark with this lighting example (lol).
Waleed Rishmawi
September 1, 2020 at 1:44 pm
Albert: you put a smile on my face..thanks my friend. LOL
Mason Sarles
September 8, 2020 at 8:56 pm
Great article. Thank you for sharing your repair with us.
Mason
Dallas,Texas
USA
Thandosebe Mavimbela
September 18, 2020 at 3:15 am
I wona like to say thanks for the knowledge you gave me ..the are few people can do this ...may God bless you sir