Question about Denon AVR-4800 Receiver

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In the past, I occasionally got no sound from my 4800. Then it would pop on after the unit had been switched on for a few minutes. This past weekend, the sound just wouldn't come on at all. I even tried to reboot the unit as it says to do in the manual with no success. I use as a 5.1 home theater unit and only run the audio from the cable through it. The cable and DVD video feeds go directly to the monitor. It's been set up this way for years with no failure, until now.

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Protection circuit (audio delay between the time you turn the unit on and actually hearing sound) is engaging because....check your speaker wiring for frays or poor connection at rear of Denon and at the individual speaker connections. If you don't find problems there you may have a noisy transistor or capacitor inside the Denon that is creating static and/or DC leakage which will keep the protection circuit from connecting the speakers to the amplifier. If it's the latter start looking for a repair shop or replacement.

Posted on Nov 08, 2010


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No home theater sound

Protect mode will kick in whenever a fault is detected.

You get the unit not powering up, and sometimes you hear a clicking noise, that is the protection switch that keeps shutting down the unit.

Causes that can start protect mode are:

Electrostatic harges on internal circuits.
Leave the unit unplugged for power for one hour or so, this will allow discharge.

Bad speaker wiring.
Check speaker wiring, try unplugging and plugging back, or start after removing one speaker at the time.

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Internal fault is the natural cause for protect mode. If all the above did not work, then the problem is a blown component or an internal fault. In this case the unit must be taken apart , tested and repaired by an experienced person.
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