The voltage in the wall lamp despite the light switch turned off

Good evening,

I just noticed a strange problem in one of the lighting sconces.

So far I have used G9 230V halogen bulbs, today I bought G9 230V LED bulbs which only allowed me to observe this problem.

Well, despite the fact that I turn off the light in this sconce using the wall switch, there is still some voltage to the sconce and a current flows through the LED bulb plugged into it, causing it to glow slightly (minimal but visible), the plugged in LED bulb lights up despite the light being turned off. After turning on this sconce, the LED lights up as it should only when it is turned off instead of being completely turned off, the current continues to pass through it.

It should not be the fault of the LED bulb because it works properly after plugging the one into other light fittings. Similarly, other LED bulbs that work properly in other light fittings (ON wall switch - led is on, OFF led switch goes out to zero), when connected to this one wall lamp, get these strange symptoms (they shine like they should not). Wall switches are the most ordinary, they do not have any dimmers.

As I wrote before, previously there was a G9 230V halogen lamp in this wall lamp and it was not visible (I think that the current that is able to emit LEDs was not enough for halogen?).

The building is relatively new, the type of network system is either TN-CS or TN-S. I would like to add that the wall lamp in which this happens is connected to two wall switches (it is on the stairs, you can light it upstairs, go downstairs and turn it off at the bottom, etc.).

What could this be happening? Loose wires in wall switches? Manufactured contacts in switches? Any worse installation problem? Only tomorrow will I be able to disassemble this wall lamp, check wall switches, measure the voltage and current. If you need any additional information, I will tell you right away when I know what.

Thank you in advance for your help.

Do you have key backlight in your switches?

I do not have. They are all white plastic without backlighting, the company Legrand.

At one point of extinguishing this wall lamp there is a triple frame and in it there are one single switch (at the end of which there is a meanwell 230v-> 12v converter), another single switch (from this wall lamp) and one more double switch (there are other wall lamps where I checked the bulb LED and works normally in them).

In the second point, there is also a triple frame with a double switch (I have other light fixtures there in which I checked the LED bulb and it walked normally), single and single (from this wall lamp).

I took off the covers of the switches in one socket (the other is identical). This is what it looks like inside (there are three in the holder, the middle one is from a flawed wall lamp). I added a photo of what this incandescent looks like and what a normal glow looks like.

I bet you cut zero with circuit breakers instead of phase In this case, the induction and capacitance of the wires generate the minimum voltage sufficient to ignite the LED "bulb".

Added after 1 [minutes]:

To check if this is the case, take the probe and touch the wire going to the switch. If the lamp in the tester does not light up, my theory is confirmed.

The LED bulb does not exist. And the neon lamp, in the absence of the ability to interpret the indications, can be confusing. [Luke]
Already corrected

Capacity.
The topic was discussed many times. Is it so hard to use a search engine?
For example here: Link

I did not write for a long time, but I did so, I dismantled both light switches, I saw how the wiring harnesses were going (fortunately they all connect under the lower light switch and not somewhere in the wall). I unfastened all the wires and connected them according to this diagram (red is phase):



found on a forum that looks like phase cutting? And, unfortunately, after such cable routing, the problem still persists

It is a typical symptom for staircase switches, which has already been discussed a dozen or several times as mentioned by my colleague "Łukasz-O". Look for these topics and draw conclusions, because nobody wants to discuss this topic again from the beginning.