I restarted the phone after that the screen stopped with the phone

The phone works without problems. For the first time this problem occurs, I turn off the phone. After that the screen stopped, it is not possible to restart using the stop button + the volume down button .. I could not open the reset screen using the stop button + the volume up button + the stop button + the volume down button = I know the method and used it previously

I went to the phone repair shop - he disassembled the phone, told me the battery was working and the phone was charged, he did not give me a solution except that he would repair the system machine, so I took it from him

Now, when the phone is connected to the battery, it vibrates every 2 seconds..when using the side button off + the volume down button for 30 seconds, it stops the vibration + the screen does not turn on at all

Thanks in advance, for any help