LED bulb lamp 230V E27 defective repair

Introduction

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 ....

What you need

Step 1 Open the bulb:

LED bulb lamp 230V E27 defective repair, Open the bulb:: step 1, image 1 of 1

the luminous hemisphere is made of plastic and glued to the lower part
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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Step 2 Repair possible ?

LED bulb lamp 230V E27 defective repair, Repair possible ?: step 2, image 1 of 2

LED bulb lamp 230V E27 defective repair, Repair possible ?: step 2, image 2 of 2

now you can see the inner workings: many small LEDs, connected in series, and a plug or solder connection leading downwards
unfortunately it is almost impossible to replace a defective LED, because of the heat dissipation, but you can easily bridge a defective LED
and again you can be lucky or unlucky, depending on the manufacturer and year of construction
If there are other components in addition to the LEDs (Image 1): Bad luck, lamp has no voltage converter, is not repairable
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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Step 3 Identify the defective LED

LED bulb lamp 230V E27 defective repair, Identify the defective LED: step 3, image 1 of 1

sometimes you can see the burned out LED with the naked eye, by a black spot; then you can skip the following steps:
You need 2 pointed test probes, either directly connected, or with a multimeter in the mA range.
put the lamp under current, attention, mains voltage, from now on fingers away !
bridge a LED with the test probes, one after the other, if it suddenly lights up, you have found the bad LED
note position, turn off the power!
(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)