20 Most Recent Denon AVR-687 Questions & Answers

Need to check on the power supply to the output drivers, if there is no response on the speakers it is possible that the output replay is under protection. You need to remove power plug and leave aside for an hour before the amplifier is plugged back. If all functions show on display but there is no sound check the PREAMP output- audio out. If there is audio then the fault is with a non switching of the power amp or a power amp protection. Since these are mounted boards with little access to testing you need to be skilled to go further to probe and proceed. Also Denon might refuse to service if the amp is tampered which also can be expensive.

Connect the Subwoofer Trigger Output for each subwoofer to thecorresponding trigger input on its amplifier. This enables the subwoofer toturn on or off together with the HK 3490. To further conserve energy,when the trigger connection is made, turn the Subwoofer Link Switch onto turn the subwoofer off when the corresponding pair of main speakersare not being used, such as during muting, when headphones are beingused, or when the main speakers are turned off using the Speaker 1/2 switch

Well, you didn't offer a whole lote of info, so I imagine that is why responses have been slow. It isn't clear at all to me what the symptom is, but perhaps it is a PiP issue, either hardware based, or a setting accessed through menus.What is the video source? For example a Dish Network HDDVR will most likely have a pip function, which splits the screen. Not knowing what is being split, or how it is very difficult to say.

check your connections again and ensure you have the audio going out. With many tv's you need to change a setting in the menu, double check that as well.

First find out if your Dish HD box has an optical or coaxial digital audio out.
Connect this digital out to to the Denon's optical or coaxial input. On the back of the receiver the digital inputs are labeled as DVD or CD/CBL . Remember to select the front input selector of the Receiver according to what ever input you have connected your HD box.
On all TV channels your 5.1 speakers may not work. You can make them work by choosing some of the DSP functions on the Denon remote. Just press the surround button and select Dolby Pro Logic II movies / music. This will convert 2 channel audio to 5.1.

the finals are burnt out.
the output transistor are blown out because they have probably been locked up in a cabinet and have not received enough air.
or if it is fairly new check your speaker connections

Hi,

your receiver is having a power problem. One or more component(s) on the power board of your receiver is defective, that's why its turning off.

This problem may have occurred as a result of power surge or excess power entering into the unit or irregular power supply.

If you know about electronic repairs, get a meter, use a screwdriver to open the receiver so that you can gain access to the power board. Use the meter to read the power board and replace any bad component detected.

Once this is done, your receiver will stay on and function normally again.

Good luck.

Check the main power switch next to the large power button. It is a small push button. If it is pressed in and you still have no light around the power button then very likely you have a dead power supply.