C2073 Transistor is hot on standby and the channel is silent. Why?

SeanYB said:

The power button of the device was broken and the fuse was burned. So, I changed the fuse, and then I directly connected it over the switch. It can be turned on and there is sound, but I accidentally found that there seems to be a channel that is silent. I changed the input terminal, but it still didn't work. Later I found that the transistor c2073 was hot.

I’m a starter. Does anyone know how to fix this? And what is the circuit diagram?

Click to expand...