Denon avr-688 My avr-688 will shut off out of the blue and will flash a red blinking light. The manual reads three possiblities---1. Overheated/My unit is cool to the touch of the hand 2. Wires are touching the back of the reciever/I double checked this and all the wires are in the proper terminals 3. The impedance of the speakers is too great/I have not changed the speakers since I first installed them and everything was working fine last night----PLESE HELP

There's an electrical problem! The unit shuts off to protect itself. the relay sound is normal and is part of the power supply - good quality amps have them. I suggest taking it to your local repair shop.

Sounds like you could have a bad speaker connection. Try disconnecting the speakers and see if it stays on. If so, connect one at at a time until it goes off to determine which one.

It sounds like you overloaded the Denon avr with too much resistence from the speakers. Please check the total resistence of the speakers before you connect them all. Also check that the speakers or their wires are not shorted!

This is a protection mode. The receiver protection circuit detects an internal problem like missing power supply voltage or blown channel and shuts down the receiver. You need to bring the unit to a repair facility.

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

SWITCH OFF THE UNIT..PUSH AND HOLD DOWN BOTH SPEAKER A AND SPEAKER B BUTTON WHILE HOLDING DOWN BUTTONS TURN ON MAIN POWER THE DISPLAY WILL FLASH WAIT FOR 3 FLASHES THEN RELEASE. THIS WILL RETURN EVERYTHING BACK TO RFACTORY DEFAULT

It sounds like it might be the overheat protection problem described in this thread. http://www.fixya.com/ThreadView.aspx?prdid=622921&thid=3736114 Your amp has a thermal protection circuit which shuts down the receiver to prevent damage from overheating. Most often this is due to using speakers with an incorrect ohm rating, such as using 4 ohm speakers in a system designed for 6 ohm . It can also occur from using 6 ohm speakers in both the A and B front channels at the same time. If you have speakers attached to both the A and B try removing one set and check if this makes the system stable.

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.

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

If you don't have a user guide, go to:
usa.denon.com From there, you can click on Support and search for archived info...you will find a pdf there.

Of your five plugs, a red and white next to each other will plug in to the audio in on your denon (Red is for Right) I would use something like the VCR-3 pair on the left side of the rear panel. The other three, Red Green and Blue are for Video Component In on the denon; Use either Video-1 or Video-2 in the component section on the right half of the rear panel.

At his point, it will be best to look at the manual, because you will have to pair the two items together in the menu system. It takes a little patience but isn't too hard.

Good luck.