I had same problem and solved it.
I have an Onkyo TX-RZ3100 AV receiver and haven't tried FM tuner for a couple of months. So today I went to listen to the radio and noting sounds, no static, no low volume, no nothing. Couldn't tune any station, no FM nor AM.
I tried everything using remote control, and tried every option in config, but nothing worked.
Then I went directly to the receiver, opened the front flap and pressed the button TUNING MODE that is right above AUX INPUT HDMI and surprisingly static started to sound and I was able to do everything as expected with my onkyo remote control, even sending tuner sound to Zone 2.
Hope this will help.
I have an Onkyo TX-RZ3100 AV receiver and haven't tried FM tuner for a couple of months. So today I went to listen to the radio and noting sounds, no static, no low volume, no nothing. Couldn't tune any station, no FM nor AM.
I tried everything using remote control, and tried every option in config, but nothing worked.
Then I went directly to the receiver, opened the front flap and pressed the button TUNING MODE that is right above AUX INPUT HDMI and surprisingly static started to sound and I was able to do everything as expected with my onkyo remote control, even sending tuner sound to Zone 2.
Hope this will help.