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The living room lights don't come on. When the switch is on, 235V, when the switch is off, the zero fire is 50V, there may be something on the 0 line that is not in good contact, and the resistance value is relatively large, so it is necessary to focus on checking the 0 line.
If the switch and the line are misconnected, the circuit should be recognized and the connection method should be adjusted.
The wire of the switch may be connected to the wrong one, or it may be connected in series with other switches, check the line.
Lights and switches are possible.
Maybe it's a segment switch fault, or maybe it's a failure of the LED light or the power box itself.
You see if the wire of the switch is connected to the wrong line, and then see if the section switch of your living room light is connected to the wrong wire.