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
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: