An Emergency LED Light Repaired
Today I got a visit to my shop by my mother in law and she brought with her an emergency light for repair. The off/on button was acting strange according to the explanation of my mother in law. She said when in the center position the emergency light should be off but for some reason it was not completely shutting down the lights. Let us investigate …
Six screws were off and I was able to see inside of the emergency light.
Not a complicated set up there; only a battery, a board and some wires connecting to the LED lights panel.
The first thing that I saw was the excessive heat on two wires inside and I could smell something burning as well.
I powered on the device and started to feel transistors on that board and they were extremely hot, not one, not two but all of them.
All these transistors you see in the photo were getting really hot and I got some burn on my finger to prove it. I took the transistors one by one looking for that nasty transistor that caused me some pain. All checked ok except one, take a look
That one with part number TPT5609 was shorted and I believe it was causing this device not to work in normal way. I did not have the exact part number but it was easy to find an equivalent part for it. The one that I found was 2sc4408.
The power is connected to the board and the power switch to the off position and as it can be seen in the photo the LED lights were not on which means one thing the device is up and running.
With this repair, I accomplished two things, a repaired device and happy mother in law and that is a mission accomplished indeed. See you in the next repair article.
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: