-★ 1. The n52a of Kim Jong Audio doesn't sound and the display screen doesn't light up. There must be something wrong with the power supply of the speaker.
-★ 2. Zheng Jin Audio n52a is a 2.0 active speaker, using 220 V commercial power supply. Can you check whether there is electricity in the socket first? If there is electricity in the socket, please ask a professional to repair it to avoid danger.