I have tried to adjust the audio settings in my TV but there is no sounds. Audio input is set correctly in my receiver. I will try touching the center pin to see if it produces the humming sound. I know my receiver works when I've used it with other TVs in the house.
I have an Yamaha receiver without any HDMI output. I bought a new Sony UHD 4K TV and when I plugged in the rca cables from my receiver to the TV there is no sound. I've checked the connections to make sure they are input correctly, which they are...still no sound.