Question about Denon AVR-681 Receiver

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Protection mode after about 3 seconds

I'm having the same problem as everyone else. My receiver goes into protection mode about 4 seconds after I turn it on. I disconnected everything as per several suggestions, testing the result after each connection was removed. Even with nothing connected, I experience the same problem. I really don't want to to deal with sending the unit away. Is there any way to avoid this?

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  • Anonymous Nov 01, 2007

    I have bought Denon products for over 15 years and never had a problem until which time they shifted manufacturing from Japan to China. As far as I am concerned, the Chinese made products are inferior to the older products manufactured in Japan.

    Last year I bought my 15 year old son an entry level AVR-587 from Circuit City. Likewise, the receiver went into protection mode within seconds of turning on the unit. After several hours of troubleshooting, I finally took it back to Circuit City. The technician hooked up the unit in the store and within minutes informed me the receiver was defective. They gave me a brand new unit as a replacement. Within weeks, I started having a problem with the new unit when the volume was turned up beyond -15db, the unit shuts down and there is no sound. I know for a fact this unit should be able to handle the Polk RM6750 surround sound system (4 satellite speaker sand subwoofer). Unfortunately, I haven't had the time to send this to a Denon repair center at my expense.

    In short, 2 brand new Denon products and 2 major problems. Unfortunately, I believe Denon made a huge mistake shifting production to China and that the new Denon products are inferior. I won't make the same mistake again and will never purchase another Denon product!

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  • 20 Answers

The protection is most likely being triggered by an internal fault. Typically the power amp section. The receiver will need professional service.

Posted on Sep 19, 2007

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Posted on Jan 02, 2017

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1 Answer

I have owned an NAD 705 Receiver for many years, and am just now having problems (probably over 20 years old). I'm getting a message on the screen of the receiver that says 'protection' .


if the receiver turns on and operates then eventually turns off due to protection mode its because a wire is shorting out the receiver.if it doesn't turn on or goes straight into protection mode then its probably time for repairs or a new receiver.

Jan 06, 2018 | NAD Audio Players & Recorders

1 Answer

What's your problem?powerprotection mode unlock


If the protect function works and causes hindrance to trouble shoot, cancel the protection function as described below, and it will be possible to enter the self-diagnostic function mode. (The protection functions other than the excess current dtect function will be disabled.)

While pressing the "Tone Control" and "Info" keys, press the "Power" key to turn on the power and keep pressing those 2 keys for 3 seconds longer.

The seld-diagnostic function mode is activated with the protection functions disabled.

In this mode, the "Sleep" segment of the Flourescent Display flashes to indicate that the mode is self-diagnostic function mode with the protection functions disabled.

Caution!!!! Usiong this product with the protection function disabled may cause further damage to your unit, so use special care when using this mode.

Apr 18, 2012 | Yamaha RX-V671 7 Channel AV Receiver -...

1 Answer

To fix cpu on protection mode


I am highly skeptical that the CPU is the problem; protection mode is designed for protection of the amplifiers.

Use an artists brush to remove any dust and grime off the voltage rails and heat sinks. Reinstall the CPU and the chassis cover. Turn your attention to the rear connector panel; check for any broken or loose speaker terminals. If your speaker wires are still connected look for any stray wire strands and pull them off or bend them away from the connector panel. Check the connection for tightness, or simply disconnect any corroded wiring that you may not be using a banana or spade connector with and clip and redress it. Perform the same inspecting and maintaining procedures on all of your speaker channels.

When placing the receiver it must also have adequate air flow around it. Anything you can imagine that would allow the unit to retain heat increases the chance of it getting it into protect mode for thermal protection. Out in open air is best.
When the receiver is properly positioned and all connections are secure, power it up; it will likely still be in protect mode. If so, press and hold the power button down until the unit "clicks" inside the chassis; this takes approximately 15 seconds. Protection circuit is reset and you can now operate the receiver.

Feb 21, 2012 | Sony STR-DE597 Receiver

1 Answer

My denon avr1200 receiver once it is turned on goes into Protection mode. How do you reset or make work?


The reciever will go into protection mode when there is a short in the speaker wires or the amplifier was overloaded. What I would do first is verify that none of the speaker wire connections are loose at the back of the reciever or at each speaker. And verify that none of the wires are making contact with each other. Then label each speaker wire as you remove them from the reciever so you can re-install them correctly. After you have disconnected the speaker wires try unplugging the reciever for 10 to 15 minutes. Most recievers have a self-resetting overload protection switch and this should reset it back to normal. Now try plugging the reciever back in and turn it on without the speaker wires connected. It should be out of protection mode now. If it is still in protection mode verify that there is not a reset switch somewhere on the back of the reciever. If it is not in protection mode now then proceed to connect one speaker set at a time and turn on the reciever to see if it goes into protection mode. If it goes into that mode after connecting a speaker then that speaker is the cause of the problem. If it does not go into the mode after all speakers are connected then try turning the volume up. If it goes into protection mode then there could be an internal short on the amplifier or a incorrect OHM rated speakers connected to reciever. Verify that the speakers are rated the correct OHMS.

Feb 22, 2010 | Denon AVR-1200 Receiver

1 Answer

Sound goes off in a few seconds


p mean protection mode, something is not right to send the reciever into protect mode, check wiring

May 05, 2009 | Audio Players & Recorders

1 Answer

Reciever power


It is going into protection mode. If you feel comfortable with directions look for the service manual and get the codes that are causing the protection error then you can find out how to fix it.

Nov 08, 2008 | Yamaha HTR-5730 Receiver

1 Answer

Turns off after 4 secs or so....From Green to Red,


probably one of the surround channels is blown, thats why it goes into protection, meassure output transistors with a ohm/diode meter if thers no shortcut in the base to collector
pauliesbouth

Aug 25, 2008 | Denon AVR-1905 Receiver

4 Answers

Amp comes on and goes right into protection mode


Turn the reciever on for a second or two and then off before the protect mode shows up on the monitor. Repeat this step about five times and check to see if the reciever does not go into protect mode. If it does go into protect mode try it again. Dont know if this is the proper way to fix the reciever but it worked for me. Good Luck

Mar 09, 2008 | Audio Players & Recorders

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