Denon AVR-4311CI No Sound

[ggil44]

Hi, I have a Denon AVR-4311ci that has no sound. I can hear the relays respond after I turn it on. Even the headphone output does not produce any sound. Mute is NOT on. I am able to navigate to speaker setup and tried the test tone (no sound), I have checked the fuses and none appear blown. The two heat sinks on either side of the transformer get warm when it has been on for a while. The display works fine and will display on a tv when hooked up to HDMI monitor out as well as program material on the Blu-ray disc. I can navigate through the menus and the unit will stay on but it is totally without audio. I have performed a system reset (7 times) and network reset (2 times) with no change in performance.
I would greatly appreciate any ideas as to what the problem could be and possible solutions I haven't tried.
Thanks,

[ben7]

Re: Denon AVR-4311CI No Sound

Judging by no blown fuses and no headphone output, I'd say there is a problem in the audio processing circuitry. Check voltage supplies and regulators on the other boards.

-Ben

[CapLeaker]

Re: Denon AVR-4311CI No Sound

Since there is no error code or shut down, there is no DC in the output stage and the amp section works. Problem is early in some where before the audio gets amplified.

[mmartell]

Re: Denon AVR-4311CI No Sound

Didn't some Denon's suffer dsp failures on their hdmi boards like some Onkyo's ? You could try blasting that board with heat to see if the sound comes back.

[ggil44]

Re: Denon AVR-4311CI No Sound

Thanks for the suggestions, I will take your advice and check voltages.

"You could try blasting that board with heat to see if the sound comes back. If I were to try that, how much heat (what temperature) would you recommend? Are you thinking cold solder joints?

[mmartell]

Re: Denon AVR-4311CI No Sound

To this day I still don't know if the bga joints were failing or the ic itself had manufacturing issues not unlike the nvidia chips perhaps. Just blast it with a hair dryer for 30 seconds or so - no need to reflow just to test out the theory.

[ggil44]

Re: Denon AVR-4311CI No Sound

Thanks, Tried it, not a peep. Tried with a heat gun till it was hot to the touch but didn't cook anything. I had it set up with a Blu-ray player hooked up to DVD (HDMI 2) and L & R stereo speaker hooked up to main. Video played on the monitor but no sound. I navigated the menu to test tone but still nothing.

[mmartell]

Re: Denon AVR-4311CI No Sound

Get hold of the service manual perhaps there are some troubleshooting charts in it.

[ggil44]

Re: Denon AVR-4311CI No Sound

Thanks for the suggestions. Will give it a try.

Regards

[williakz]

Re: Denon AVR-4311CI No Sound

Sure nobody's been in there before? Sounds like a connection either broke loose or wasn't reconnected last time it was worked on. I've found both on units I've worked on (and I've been the culprit more often than not!).

Also, can you inject signal (of appropriate freq and level) to test all your amps channels? If they're good, you need to determine where the unit is losing signal. Good luck.

[Longbow]

Re: Denon AVR-4311CI No Sound

First, I would do a system reset (detailed in owner's manual). Somewhere in the vast menu system is the option "set to factory defaults". Do that. Next, perform a system update after establishing a network connection. You should get lots of on-screen information during the system update process that might help.

[Agent24]

Re: Denon AVR-4311CI No Sound

Hook up an audio source and start tracing the signal through the circuitry, find where it stops...