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How to reset power when failure for denon AVR-688

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  • 53 Answers

It is not resetable,

Posted on Dec 02, 2012

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Posted on Jan 02, 2017

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SOURCE: No video on Denon avr 688

After days of frustration the real problem was with the cable box. It needed a firmware update. Following forum advice I disconnected the cable box power cord for a few minutes, reconnected it, allowed the cable box to reinitialize. Turned off receiver and TV. Turned TV back on and set it to HDMI connection, turned on receiver and all worked fine. Great picture and sound.( Needed to buy an optical cable to go from the cable box to the receiver to get sound from the speaker system. )--the dirtybird

Posted on Apr 15, 2009

SOURCE: DENON AVR-1404 switch on problem

Maybe the audio amplifier IC´s are damaged that´s why go on the protection mode

Posted on Aug 22, 2008

  • 119 Answers

SOURCE: Denon AVR-688 Dolby Digital issues

IT IS ALWAYS BEST TO CONNECT ANALOG AUDIO IN ADDITION TO THE OPTICAL, COAXIAL OR HDMI AUDIO CONNECTION. IF USING OPTICAL OR COAXIAL CONNECTIONS BE SURE TO CONFIGURE IT IN THE RECEIVERS DIGITAL ASSIGNMENT AREA IN SETUP.
ALSO, ON THE FRONT OF THE RECEIVER IS AN INPUT MODE BUTTON, PRESS THIS BUTTON UNTIL AUTO IS DISPLAYED

Posted on Mar 03, 2009

  • 163 Answers

SOURCE: I have a Denon AVR-688

Try to reset the unit: hold "speaker A" and "Speaker B" buttons and power on the unit. Display will be flashing, release the buttons after 3 seconds. If the problem still there, most likely you have bad digital signal processing (DSP) board - send the unit to repair facility.

Posted on May 19, 2009

  • 1 Answer

SOURCE: Denon RC-980 subsitute remote for Denon AVR-3200

I have a remote left over from my denon ACR3200. the remote is RC-825. It is currently listed on Ebay.

Posted on Jan 10, 2010

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1 Answer

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http://www.avsforum.com/forum/90-receivers-amps-processors/1386123-help-denon-avr-1603-shuts-down.html
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Denon avr 688


check to see if there is audio from the headphone jack. These unit have a history of bad headphone jacks that cause the unit to think there are headphones plugged in even when there isn't. Sometimes plugging phones in and taking them out will fix the problem for a while.

Jul 23, 2013 | Audio Players & Recorders

1 Answer

I have a problem connecting my avr 688 into my tv, i dont vave the manual on how to connect so if possible, i want to have one


i guess you want tv sound coming out of you denon.you will need a red and white rca lead. one end into the back of the denon.either LD,AUX,OR VIDEO.then turn the selector on the denon to the input you plugged into.hope this makes sense

Oct 17, 2010 | Denon AVR688

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Denon avr-688


I have the same problem with my AVR-688, were you able to find a help?

Sep 18, 2009 | Denon AVR688

1 Answer

I am having trouble hooking up my xbox through my denon avr 688. I can get audio but no video. Help me, please.


Are you using an hdmi or a component vid from the xbox to the avr? and a hdmi from the avr to the tv? Some receivers only pass through not upscale the video. My xbox uses the component vid out to my avr so I have to also use component to my tv from my avr.

Aug 19, 2009 | Audio Players & Recorders

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Avr 688 shuts down immediately after powering on


Internal problem with power supply or one of the channels. Bring it to a repair facility.

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I have a Denon AVR-688 and recently I haven't been able to use any of the surround modes at all. The only mode that works, regardless of the component, is Direct mode. Any suggestions?


Try to reset the unit: hold "speaker A" and "Speaker B" buttons and power on the unit. Display will be flashing, release the buttons after 3 seconds. If the problem still there, most likely you have bad digital signal processing (DSP) board - send the unit to repair facility.

May 18, 2009 | Denon AVR688

1 Answer

No video on Denon avr 688


After days of frustration the real problem was with the cable box. It needed a firmware update. Following forum advice I disconnected the cable box power cord for a few minutes, reconnected it, allowed the cable box to reinitialize. Turned off receiver and TV. Turned TV back on and set it to HDMI connection, turned on receiver and all worked fine. Great picture and sound.( Needed to buy an optical cable to go from the cable box to the receiver to get sound from the speaker system. )--the dirtybird

Apr 14, 2009 | Denon AVR-3300 Receiver

1 Answer

Denon AVR-688 Dolby Digital issues


IT IS ALWAYS BEST TO CONNECT ANALOG AUDIO IN ADDITION TO THE OPTICAL, COAXIAL OR HDMI AUDIO CONNECTION. IF USING OPTICAL OR COAXIAL CONNECTIONS BE SURE TO CONFIGURE IT IN THE RECEIVERS DIGITAL ASSIGNMENT AREA IN SETUP.
ALSO, ON THE FRONT OF THE RECEIVER IS AN INPUT MODE BUTTON, PRESS THIS BUTTON UNTIL AUTO IS DISPLAYED

Jan 03, 2009 | Denon AVR688

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