I've tried 4 different cable, eliminating any adapters. But how would the cable cause the problem I'm having, that is, sound working perfectly for IPTV or local media streaming, but sound aq going to zero for live TV?
A higher data rate can make the difference. If you need another proof to be sure about the cable: Click!
Can you confirm that you've been deactivated de-interlacing for testing?
Have you tried "Audio pass-through" on / off at the audio settings?