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An Emergency LED Light Repaired

By on October 27, 2020
emergency led light repair








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 …

emergency led light repair

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.

emergency led light repair and fix

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.

how to fix emergency led light

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

emergency led light circuit board repair

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.


how to repair and fix emergency led light

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:




  1. Albert van Bemmelen

    October 27, 2020 at 8:05 pm

    You know what they say... If your mother in law doesn't fly away on a broom you're safe.
    My mother in law couldn't get daughters...(lol).
    All crazyness on a stick...Good job. And a happy mother in law which I guess also makes a happy wife!

    • Waleed Rishmawi

      October 28, 2020 at 5:11 pm

      Albert: indeed. it is a two way streets on happiness on both ways. have a blessed day

  2. Yogesh Panchal

    October 27, 2020 at 9:27 pm

    well done! waleed

    • Waleed Rishmawi

      October 28, 2020 at 5:12 pm

      Yogesh: thanks man. be safe and sound

  3. Parasuraman S

    October 27, 2020 at 11:50 pm

    Yes, like Albert van Bemmelen said, if a mother-in-law is kept happy, wife would be happier! So, with this repair, you not only brought back a unit to working condition, but also 'air-conditioned' an essential relationship! (LOL)

    • Waleed Rishmawi

      October 28, 2020 at 5:12 pm

      Parasuraman: LOL. yes indeed. have a blessed day

  4. Sarath

    October 28, 2020 at 8:27 am

    how did you find the equivalent for TPT5609

    • Waleed Rishmawi

      October 28, 2020 at 5:14 pm

      Sarath: I checked the specs and I matched it with something else. you could go online and look for equivalent and it will give that to you. have a blessed day


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