Fix Led Bulb

About: Lover of DIY things .

I was disappointed with low life duration of a led bulb . Less than 1year is a shame , so i decided to make some research and found out that those bulbs have a circuit inside of it with many led in series . Like blinker christmas lights if one is burnt all the other don`t work .

  1. Notice that there are many reasons to bulb not work .
  2. Only fix in this instructable is led damaged .Also notice this is a quick fix.
  3. Right thing to do would be replace burnt led .
  4. I know that Ohm law should be considered and used a resistor

Step 1: Opening Bulb

Those bulbs are easily opened using a screwdriver around the joint , pieces are made of some kind of plastic , so no worry about break things .

Step 2: Testing Leds

Leds are diodes that emit light , then being a diode means that current goes just in one direction , not the opposite . Using a multimeter to make a continuity testing (shown in picture). Test all of them , when find the one that don`t turn on make some mark on it with a pen.

Step 3: Smash the Black Sheep

Smash burnt led with flat nose plier . It is easy

Step 4: Soldering

Remaining place left by led are metal base on PCB . Use solder wire and soldering iron to joint separated metal base.Glue used on bulb is not strong ,i just closed bulb attaching spots on there , but if necessary can be used some glue to make it stay closed .

Step 5: Finish

As led are very bright i could not show the result , i mean other leds working despite that there is one less. I am very happy with result , my led bulb working again. As there was another bulb left a did the same process and got another bulb back to life .

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    3 Discussions

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    E_Alves

    6 days ago

    Hey

    If by how often you mean how many leds can be done this trick , well, blinker christmas lights(regular lamp) have a specific number of lamps to match the rule (in a serie circuit voltage is divided by the number of lamps , amperage is the same ) . In our case one led is suppressed, then theoretically other leds have a little bit more voltage (i guess input voltage on leds are 9V) , if so instead 0,321428571V (9\28) there is 0,333333333V (9/27) . LED max voltage input could be the limit , but i have no experience earlier.

    P.S. (Solda Cobix :) . Brasileiro ?)

    1 reply
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    MikBE_Alves

    Reply 4 days ago

    Ordinary (incandescent) bulb Xmas lights will tolerate this trick, up to a point -- in fact some of them have bulbs which will self-short-out when they fail. True, each other bulb will see a higher voltage, and eventually this will lead to a cascade failure. So you should replace them as soon as possible.

    But for LED strings -- if there is a current limiting circuit (not just a resistor), then removing and shorting one or two LEDs like this will make no real difference. The current limiter will still allow the correct current to flow, and the voltage dropped across each LED will be the same. The difference will be the voltage dropped across the current limiter circuit.

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    ManoelG3

    7 days ago

    Nice I'ble, the photos are very good!
    In your experience, how often can a failed led lamp be fixed this way?
    All the broken lamps that I've examined so far (I had disassembled many of those which I can put my hands on), had failed in the electrical circuit, not in the leds.

    (tá usando solda marca Cobix? ;-)