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Model AVR-688 7.1 CHANNEL HOME RECEIVER: UNIT WILL SHUT DOWN AND POWER INDICATOR WILL FLASH. UNIT SI NOT HOT NOR ANY WIRES TOUCHING. I CALLED CIRCUIT CITY AND THEY SAID I MUST CONTACT DENON. PRODUCT WAS PURCHASED MAY 24, 2008 AND WE PURCHASED "FIRE DOG" INSTALLATION FOR PROPER SET-UP.

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  • Anonymous Dec 06, 2008

    same thing on referb unit from Ecost

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5 Suggested Answers

DickCanFixIt
  • 948 Answers

SOURCE: i have the denon avr-688

Check your blu-ray connection. Is the HDMI cable going from the player to the receiver, then another HDMI cable going from the receiver to the television? What about your TV input? Is there a cable going from the cable converter box to the receiver's input?

Posted on Dec 29, 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

  • 1 Answer

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

  • 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

smarthome2
  • 1114 Answers

SOURCE: The Denopn avr 688 goes automatically into

The most common problem found on FixYa for Audio Video Receiver's is:

My receiver say's "Protect" or turns on then off. What's wrong? Seven times out of ten it is a shorted speaker or speaker wire2_bing.gif. To determine your exact problem, the first step is to disconnect all speaker wires "at your receiver" Next: Turn the receiver back on. If your receiver still says "protect" or turns off, it needs to be serviced. If your receiver stays on; reconnect your speakers one at a time and power back up after each speaker. You may find that after reconnecting all speaker wires it works! Most commonly the small braids of wire from the + to the - have touched and have caused the problem. In some instances, you noticed the problem only when turning the volume up. either way, make sure the exposed wires to your receiver are no longer than 1/2" long and are completely under the screw down terminal or slide in. When you've found the wire or speaker with the problem, your receiver will go back into "protect" At this point, disconnect the wire from the speaker at the speaker that may be causing the problem then test again.* Note* Make sure speaker wires do Not touch each other as this Will cause a short! If you turn the receiver back on and it stays on, you now know the problem is in your speaker itself. To test your speaker, you will need a multimeter. Set it to ohms resistance and touch the speaker terminals, if there is a short internally the meter will read "1......" If it's an analog meter, it will peg to the right. There's your problem. Now, within any speaker there are quite a few possibilities as to what could be causing the problem. Most common is a blown coil and the speaker needs to be replaced. Some speakers have internal crossovers (usually floor standing speakers2_bing.gif) and may have a shorted or burnt board (usually very visible brown burn marks on the board) and can possibly be repaired if your handy with a soldering iron. Now, if you disconnect the speaker wire at the speaker and it still says "protect" Check your wire for the obvious cut or nail thru the wire if possible. If your system has wiring that runs behind walls, you may need to use your meter again. Disconnect the wire at both ends, keep the ends separated, put your meter on ohms resistance and touch probes to the + and - wires at one side. If the meter pegs to the right or reads "1...." the wire is shorted and needs to be replaced or repaired at the short. Hope this helps.

Posted on Jun 17, 2010

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1 Answer

Standby indicator flashes


When the "Protection" indicator comes up the display panel of my receiver or the On/Standby LED is flashing, does that mean my receiver needs to be repaired?
The "Protection" light comes on when the receiver's current sensing and thermal monitors detect some unusual operating condition that, if left unchecked, might damage the amplifier. This can happen if there's a dead short in a speaker wire or if you're using very low impedance loudspeakers at high volume for an extended length of time. On older model AVRs you may see the word "Protect" on the receiver's display. More current models will indicate a flashing red light on the Standby LED when a Protection circuit trips
n thermal cases, the circuitry will automatically reset after a few minutes of cool down and the Protection indicator will go out and normal operation will resume. If the protection light came on due to a speaker wire short, low impedance condition or a bad speaker, the receiver's power will need to be turned off to reset it. Before turning the power back on, all speaker wire connections should be checked for their integrity at the receiver side and at the speaker side. If the protection light goes on immediately after you turn on the receiver, disconnect the speaker wires at the receiver side and retest. If the receiver's protection light goes off, then there would still seem to be a problem with one channel's speaker wires or speakers. Connecting them one by one and retesting should allow you to find the problem speaker or connection.
If after checking all your connections, the Protection indicator stays lit, you may need to "initialize the microprocessor (see the FAQ on that topic) or take your receiver to an authorized repair center for a diagnostic. The "Initialization of the Microprocessor" or "reset" procedure can be found in your owner's manual on current model AVR product. Please note, this will erase all setup configurations in the system and require the system to be setup again. You may want to mark down the settings before resetting your receiver to aid in the setup process. If you had an installer setup your system, you can contact them for assistance and any associated costs that may apply to setup the receiver again would be the responsibility of the owner.

Jul 17, 2016 | Sony DAV-FR1 System

1 Answer

Dennon gets hot shuts off


how are your four outside speakers hooked up? If you have four speakers hooked up to only two output channels on the receiver, the receiver is sensing a short and shutting down to avoid damage to the amp.

Jul 20, 2013 | Denon AVR-3806 Receiver

1 Answer

I have had my Denon AVR-1907 for about 20 months. About two months ago, it started shutting down and the On/Off button blinks red. Almost all the time it would clear by itself for no reason and then work...


You will have to check with a volt/ohm meter the + and - 15volt regulator ics in the power supply if they are off by more then 3 volts it will shut down as soon as it is turned on,and you still will have a flashing red light. also you may want to check the output transistors for shorts if your regulator ics are good.

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1 Answer

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 have an AVR2106 shuts down right after being turned on


You have a bad channel or power supply problem and need to send the unit for repair. You may send it to ebcelectronics here is a link.

Aug 13, 2009 | Denon AVR-2106 Receiver

2 Answers

Avr 688 shuts down immediately after powering on


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

Aug 09, 2009 | Denon AVR-685 6.1 Channels Receiver

1 Answer

Shuts off then red light indicator flashes, disconnected all speakers but still wont work


Hi, this is a power board issue. remove the cover and make sure that this unit doesn't have blow fuse. if the fuse is fine, you will then need to replace the integrated power/ main board.

May 21, 2009 | Denon AVR-1803 Receiver

1 Answer

AVR-589 Denon Receiver Keeps Shutting Off


even if the wires are not touching they can still arch. make sure there is no bare wire showing ie. cannot see any unshielde speaker wires. id unplug then replug back in

May 18, 2009 | Denon AVR-3805 Receiver

1 Answer

When I turn on my receiver, it automatically turns off and the power button flashes red. Prior to shut down, the receiver display notes "Tuner Ext. In" What's the problem? It has worked p


Protection circuit turns off the unit because of critical conditions- wrong power supply voltages or one of the power amplifier channels is bad. First, visual inspect the power amp board near the heat sink for burned resistors, test outputs for a short. If there are no problem you may try to turn the unit on and you have several second before it shuts down to check power supply voltages and power amp output voltages and bias, then ... Long story you'd better take it to a repair shop or repair at ebcelectronics.com

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2 Answers

Harmon kardon avr 125 shuts down


If you want to fix it:

It must be a contact problem arount the power switch, power cable, fuse or the condensator area.
Maybe you can se a black color on the board.
And checking the solderind points with a magnifyer can help too.

Thats all from that distence.

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