A bus driver who works for an international organization pulled his bus next to my shop and showed me something that needed repair. This driver transports physically and mentally challenged people from their home to their special school. On that bus there is elevator for people with wheel chairs and every time that back door is opened a LED light panels on both doors come on as warning lights that the elevator is active and to be aware of it.

It has four LED lights and when they come on, the programmer goes through a different pattern of lights which was cool to watch.

With this kind of LED lights, they are usually connected in series and when a LED or two go out, the whole panel stops working. So basically I was looking for a defected LED light on that Panel. Let us begin.

The reflecting glass was taken off and as you can see, there are four LED lights on this panel. It is easy to search for the defective LED light using a multi meter testing one LED each time. If you want to test the whole thing at the same time you need to buy a LED light tester or you can build one on your own.

I connected the positive probe to the positive side of the LED light with the negative probe to the negative side of it; the LED light came on showing a red color which means it was working fine.

As you can see, the defective LED light was found and it had to be replaced.

I took the defective LED light out but I could not find the right size LED light for replacement.

I replaced it with a smaller size one but it did the job. Sorry I did not take a photo of the finished repair.

I put everything back together and installed the LED panel back on the bus and when I opened the door this is what I saw. Take a look

Here you could only see the two lights coming on because as I mentioned before, the panel goes through patterns of light at the time.

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.

P.S- Do you know of any your friends who would benefit from this content that you are reading now? If so, forward this website to your friends or you can invite your friends to subscribe to my newsletter for free in this Link.

Note: You can check his previous repair articles in the link below:

https://www.electronicsrepairfaq.com/a-dead-welding-machine-brought-back-to-life-model-kauffe