hifi engine

Speakers humming when connected to TV

Greetings to all members! I need a piece of advice on how to solve humming noise coming out of my speaker surround sound system. I connected it to PS4 via A/D converter using Toslink cable - it worked fine. Today i connected the system to my TV using coaxial cable (since my TV has got only coaxial output). It works, the sound is well interpreted, but speakers are humming in the background. What are my options? The system is Sony MHC-NX3AV with a subwoofer.