How to disable FM receiver in SVEN MS-2051?

Question

Acustic systems

Hello.
There is SVEN MS-2051, this speaker has an FM receiver, Bluetooth, AUX and PC.
I want to connect a PC through the PC input and a TV set through the AUX, the acoustics are always on at 50% vol. To adjust the sound from the keyboard or from the TV remote control.
The problem is that only one button is used to switch the mode and between PC and AUX, there is FM and when you get on FM, then either the wave yells at the whole house or hisses if there is no wave!
There was an idea to find an empty wave, but there is no such one.
I also thought it might somehow drown out - but this is nonsense.
It remains only to unsolder the FM module, but dumb! What problems can there be?