Why is the LED spot on when the switch is off?

Sergei asks:

Hello! The situation is a two-line switch (phase break on the switch), 2 LED spots (12V) on each line. On both lines, near spots turn off when turned off, while distant spots lightly burn. On the advice of the Internet, for the sake of experiment, I simultaneously threw a resistor (2W, 30 I don’t remember something) onto one of the distant lamps. As a result, there is no flicker on the second line, but where the resistor stands, the lamp does not turn on at all. What will be your advice?

The answer to the question:

Hello! Do not interfere with the wiring if you do not know what the resistor is measured in. Firstly, resistors or capacitors are connected parallel to the fixtures if the switch is illuminated.
Remove it from the circuit, if it is 30 ohms - then it is too small - 30 kOhms - normal. To the far, near or middle lamp, if they are connected in parallel, it does not matter.

If you still have a light switch, remove the resistor and try putting the capacitor at 630V and 0.1 microfarad (microfarad) non-polar film, it looks like a red-brown pad the size of a thumbnail.
If there is no backlight, then there may be problems with the wiring. Often there is a dull glow of LED and energy-saving lamps in the off state when the switch is not in the phase but in the neutral wire, as well as with "wet" or old wiring with leakage in insulation.

p.s. Have you definitely connected the resistor in parallel?

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