There seems to be a problem with the power supply of SONY's CD player (it doesn't respond when I put the battery in). Where can I get it repaired in Shenzhen?

I don’t know where your problem is? Does the power supply refer to the adapter or is it inside the machine? If it is an adapter, it doesn’t cost much to buy a new one. If it is inside the machine, it is recommended to go to an authorized repair station to repair it. It's good. After all, if it is repaired at an outside shop, there is no guarantee. And if you are still under warranty, once you go outside for repair, the warranty will no longer be valid.