Repairing my home ceiling LED lamp

in STEMGeekslast year (edited)

Hello Stemgeeks,

A lot of things we use every day have LED technology. LED lamps have been slowly taking over for incandescent lamps in flashlights, car headlights, searchlights, and the bulbs we use at home. This is because they are more efficient and last longer. LED lights use less electricity and last longer than other types of lights.

I have 4 Watt ceiling LED bulb at home which I wanted to repair as it was not turning on since last few days.



Let's start by looking at how the LED lamp is built. Let's be careful when we remove the light cover. They can be put on or made of glass to cover some LED lights. These can be hard to get rid of.


It has a small yellow LEDc SMD inside. To see the 8 tiny LEDs in this 4 Watt bulb, remove the lid.


It is becoming more common for LEDs to be used in high-wattage lamps in general. All 8 yellow LED bulb used are 0.5 watt SMD leds. The LEDs here are connected in series with each other. Failure of one of the LEDs prevents the other LEDs from working, even if they are intact.

The LED Lamp's Inside


At the bottom of the LEDs, you can see a very simple circuit if you look close enough. Alternating current is changed into direct current and then LEDs that are used in the circuit are driven by it.


LEDs need a heatsink.

A high-quality LED bulb needs a good cooling system in order to work well. Heat is the main enemy of LED bulbs. LEDs that work in very hot places have a shorter service life. It is possible to use high-quality LED bulbs for a long time.

This is how I can fix the LED lamp in my home's ceiling.

Materials that you need to do the job
A set of soldering irons, like this one.
Pliers, screws, and chisels and few SMD LED 0.5 Watt

An inactive LED usually has a little black dot on top of it, but it doesn't work. But, just in case, I'll check all the LEDs again.


3 volts of direct current is what I use to power the little LEDs to see how it works. I need to power up in line with the + and - ends of LEDs.

It took me two pen batteries to do the control in this case.
I had to be careful because LEDs can't work if they get too much or too little electricity.
Chisels are used to remove the LEDs that burst after I removed them.


There were metal pieces under the area that had been cut out. This is where I soldered the SMD LED.


I pay attention to the + and - ends of the LED when I'm soldering because it won't work if I connect them in the wrong way.


I had a hard time soldering SMD LEDs, but I did it in the end.
After soldering, of course, I checked to make sure it works.

And the LED bulb was successfully switched on.

Thanks for viewing my blog.


Something strange seems to be happening in the lightbulb world. The very first CFLs that I acquired still work. The very first LED bulbs that I bought still work. The newer LED bulbs that I purchase seem to fail at an alarming high rate.

Most LEDs are designed so that one has to destroy the bulb to repair the LEDs.

My guess is that the LED companies are now engaged in the wasteful practice of planned obsolescence. Since LEDs are repairable, we need more people to do what you did in this video.

BTW, the LEDs that aren't fixable have a little bit of copper on the circuit board. I smash the broken ones and extract the copper ... but I hate the waist that comes from planned obsolescence.

Older lamps last long, that's true, so was this ceiling bulb. In 90% cases of failed bulbs, LED is the only part which goes off. That's why I gave a shot myself and found the damaged LED.

LED bulbs are repairable and as I mentioned 90% cases only LED is damaged. Since they are all in series, we can either replace with new one os just short tho points.

Since LED desoldering and replacing is tedious process, I shorted the two pins of it. So although I had one less LED but the bulb still works.

Hello Steemgeeks,

Steem is a trigger word around here.
This is why.
You were looking for stemgeeks.

Thanks for correcting me.

Greetings. Why don't I put a 120 Ohm resistor? It is what is generally customary, unless the power source is switched.

Thanks. All the LEDs are in series and the current limiting resistor is already there in the board. If you mean placing a 120 Ohm resistor in place of damaged LED, It can still work because it is a small value resistance, and it won't affect the limiting current.

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