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You can dismantle the segmented controller of the chandelier. Just connect all the lights to the neutral and live wires. One thing you have to be sure of is that the power supply of each group of lights is 220 points.
There are many reasons why the crystal chandelier does not light up: >>>More
Now it is certain that the live wire and switch are not broken, and if it is confirmed that the lamp is in good condition, it must be the neutral line disconnected. >>>More
If you suspect that the switch is not in good contact, try replacing the LED light with a normal bulb.
Generally, there is an open circuit of the LED lamp beads in series, and it can be replaced or directly short-circuited.
First look to see if the bulb is broken, and then see if the power cord is not connected properly.