Facing TV Problems? Ask a TV Technician.
Hello, my name is Rusty. What are the devices you have connected to coax and HDMI?
That's where the problem would be, let's take a look. Some TVs will remember the volume setting where you left it for each input. On coax, turn the volume all the way down. Now switch to the HDMI input. Is the volume all the way down, or does it come up with sound?