Introduzione
in 230V LED bulbs are many individual LEDs connected in series, like in an old Christmas tree light chain, and if one of them fails, then the lamp remains dark, or flickers, and the normal consumer can only dispose of it.
but unlike incandescent bulbs and energy-saving lamps, LED bulbs can be repaired .... not always, but often ....
Cosa ti serve
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the luminous hemisphere is made of plastic and glued to the lower part
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slight mechanical deformation loosens the bond and the hemisphere comes off .. sometimes it's easy, sometimes it's tough .. A matter of luck
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now you can see the inner workings: many small LEDs, connected in series, and a plug or solder connection leading downwards
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unfortunately it is almost impossible to replace a defective LED, because of the heat dissipation, but you can easily bridge a defective LED
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and again you can be lucky or unlucky, depending on the manufacturer and year of construction
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If there are other components in addition to the LEDs (Image 1): Bad luck, lamp has no voltage converter, is not repairable
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if there are less than 10 LEDs (Image 2): also unlucky, not repairable. The voltage transformer can not compensate for a missing LED
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sometimes you can see the burned out LED with the naked eye, by a black spot; then you can skip the following steps:
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You need 2 pointed test probes, either directly connected, or with a multimeter in the mA range.
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put the lamp under current, attention, mains voltage, from now on fingers away !
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bridge a LED with the test probes, one after the other, if it suddenly lights up, you have found the bad LED
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note position, turn off the power!
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(of course it can also be the voltage transformer defective, but that is unlikely. In my experience, to test the transformer is difficult, because without a suitable load it does not run)
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(with slightly reduced power)
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Glue the hemisphere back on, with either Uhu (liquid adhesive) or scotch tape
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can be that the bulb soon fails again ... but can also be that it still shines for a long time ...
can be that the bulb soon fails again ... but can also be that it still shines for a long time ...
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2 Commenti
Wow! It's easy to understood
Wow - ich bin total begeistert! Ich habe mit diesem Trick soeben unsere Esszimmerlampe repariert, die seit 6 Monaten rumliegt und die ich jetzt eigentlich hätte ersetzen müssen. Wie so viele Lampen gibt es die nur mit fest installierten LEDs. Da kann man dann nur noch die komplette Lampe wegschmeißen, wenn eine LED durchgebrannt ist. Und die Industrie freut sich über 3 Jahre Lebensdauer.
Die LED hatte einen schwarzen Punkt und war direkt zu sehen (Hatte ich natürlich überhaupt nicht drauf geachtet). Ich habe einfach die LED selbst zerbrochen und einen Lötpunkt stattdessen drauf gesetzt. Unter dem LED-Leuchtkörper sind nämlich zwei Metallteile, die man einfach miteinander verbinden muss. Damit erspart man sich das fiselige Rumlöten an den winzigen Kontakten.
DANKE für diesen genialen Tipp, der die Leuchtenindustrie arm und die Umwelt reich macht.
