DENON AVR-2800 No sound from any channel.

mrfix90 · 31st August 2009, 09:09 AM

Denon amp that I am trying to repair. It was working fine suddenly it stopped. No more sound. Once in a while comes on , if the receiver is on for sometimes. I am not sure what to change. I guess it is in output stage. Do I have to change the output transistor or it just some kind of relay?

when I turn the receiver on, the power/standby light blinks 7 or 8 times and ralay clicks. But no sound. Please give some input so that I can fix the amp. I am really into it. Any help would be appreciated.

audioDIYer · 31st August 2009, 01:38 PM

Check for DC on outputs.
One of the channels has DC due to some faulty component.
AV receivers tend to get very hot and some resistors get open-circuit.

mrfix90 · 2nd September 2009, 05:47 AM

Quote:

Originally Posted by audioDIYer

Check for DC on outputs.
One of the channels has DC due to some faulty component.
AV receivers tend to get very hot and some resistors get open-circuit.

mrfix90 · 2nd September 2009, 05:49 AM

so problem might be because of resistor? The thing it is just intermittent. Sometimes if I keep it on for a while sound comes back. And than sound becomes scratchy...like skipping cd and than cuts off ..no sound.

audioDIYer · 2nd September 2009, 08:38 AM

I learned to always check potentially faulty resistors and capacitors...
You may also have problems with any transistor..

Can you measure the voltage at output? Ant DC present?

Try this:
use a 'spare' speaker with a >20 Ohm resistor and a large bipolar capacitor in series. this way any DC will be blocked to the speaker.
If possible, get an cold air spray and put a little of it on each transistor. If there is no difference, spray on resistors starting from output.

Another thing to check: connect a working amplifier to the input of the amp modules of your AVR. If the sound is there and clean, the problem is the module, if not, you can have problems with other part: digital volume control.. maybe not

If you have the service manual, send me a copy and I'll show where to start.

unclejed613 · 2nd September 2009, 11:17 AM

does the display stay lit? if so, have you tried changing surround modes. if you want to bypass the DSP, put it in EXT IN mode and feed signal in through the EXT INPUT jacks on the back. if it works fine that way, you probably have a problem with the DSP board or one of the power supplies feeding it. +/-15V regulators are a common failure item in Denons

31st August 2009, 09:09 AM	#1
mrfix90 diyAudio Member Join Date: Mar 2009	DENON AVR-2800 No sound from any channel. Denon amp that I am trying to repair. It was working fine suddenly it stopped. No more sound. Once in a while comes on , if the receiver is on for sometimes. I am not sure what to change. I guess it is in output stage. Do I have to change the output transistor or it just some kind of relay? when I turn the receiver on, the power/standby light blinks 7 or 8 times and ralay clicks. But no sound. Please give some input so that I can fix the amp. I am really into it. Any help would be appreciated.

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31st August 2009, 01:38 PM	#2
audioDIYer diyAudio Member Join Date: Dec 2005 Location: At work	Check for DC on outputs. One of the channels has DC due to some faulty component. AV receivers tend to get very hot and some resistors get open-circuit.

2nd September 2009, 05:49 AM	#4
mrfix90 diyAudio Member Join Date: Mar 2009	so problem might be because of resistor? The thing it is just intermittent. Sometimes if I keep it on for a while sound comes back. And than sound becomes scratchy...like skipping cd and than cuts off ..no sound.

2nd September 2009, 08:38 AM	#5
audioDIYer diyAudio Member Join Date: Dec 2005 Location: At work	I learned to always check potentially faulty resistors and capacitors... You may also have problems with any transistor.. Can you measure the voltage at output? Ant DC present? Try this: use a 'spare' speaker with a >20 Ohm resistor and a large bipolar capacitor in series. this way any DC will be blocked to the speaker. If possible, get an cold air spray and put a little of it on each transistor. If there is no difference, spray on resistors starting from output. Another thing to check: connect a working amplifier to the input of the amp modules of your AVR. If the sound is there and clean, the problem is the module, if not, you can have problems with other part: digital volume control.. maybe not If you have the service manual, send me a copy and I'll show where to start.

2nd September 2009, 11:17 AM	#6
unclejed613 diyAudio Member Join Date: Dec 2006	does the display stay lit? if so, have you tried changing surround modes. if you want to bypass the DSP, put it in EXT IN mode and feed signal in through the EXT INPUT jacks on the back. if it works fine that way, you probably have a problem with the DSP board or one of the power supplies feeding it. +/-15V regulators are a common failure item in Denons