Is My Onkyo Receiver's Tuner Dead or Just Playing Posum?

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.

Wow! That's amazing! I'll see if I can do something similar with mine. Question: Did you ever receive programming? You know, music? Or is it just static... Thanks

Well, I tried your suggestion. Pressing the "tuner mode" button on my unit only selects between manual tuning and automatic (scans for first useable station). I've used the tuner successfully in Las Vegas many years ago but now, nothing. Some day I'll set it up outside and see if it works there. Thanks for your input!

I lost the AM/FM tuner in my Integra DTR9.9 (vintage 2008) a long time ago. It just stopped working one day. Totally silent. So dweller, I don't think you're crazy. I also live in Las Vegas (not that it matters to this discussion). I was using the XM mini-tuner functionality on the DTR9.9 and it was flaky as well. I would lose the option to select the XM tuner from time to time and I would have to do a full reset on the receiver to get it back.I bought a used Integra TUN3.7 standalone XM/AM/FM tuner. The XM worked fine on this unit. But the FM tuner would flake out after it warmed up for about 20 minutes. It would switch in and out of HD radio mode and make a lot of noise making it un-listenable.Finally I bought a Sangen HDT-20 for AM/FM listening and it is working well with a dipole antenna stuck to the wall of my living room.

 Yes, it's funny the thing just conked out. I really enjoyed the digital-radio feature of this receiver. I may be rearranging my HT room which will let me take the Onkyo outside for a clean signal. Then I'll know for sure.
 P.S. In Vegas, I had a clear line-of-sight to the Black Mountain transmitters (in Henderson). Regards