Question about Denon AVR-3805 Receiver

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Receiver turns off, display does not turn on

I have had my receiver for over 3 years and it has worked flawlessly. Recently tho, I am noticing 2 problems - the display on the receiver sometimes, does not light up on power up (sometimes it turns on after some play time).
The receiver also shuts off without notice and the power switch turns red (standby mode?). Are these problems related? Please help. Thanks in advance.

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Maybe, they are most likely related, but I can not be certain without troubleshooting it on my workbench.

These problems could be a fault of some solder connections being bad. Most of the time it is the power supply and amp circuit that have some very heat stressed solder joints and they need to be reflowed. The display problem may be the solder connections on the display board. You may see a pair of wires that go from the main power transformer to the display board, if I remember right, they are orange. That pair of wires should have an A/C voltage on it that powers the LCD of the unit. Where it plugs into the display board, it can have broken solder joints that need to be resoldered. It could be a problem with the power transformer, if you have a multimeter check to see if you have that A/C voltage when the display is out. See if it is the same as when it is on. That would help to determain what direction to take in troubleshooting it.

These unit are very difficult to take apart, the entire back panel must come off of it for you to take out the amp/power supply board. There are also a lot of screws in the board that hold it on the bottom chassis. Some screws go all the way to the bottom, and others go into a bracket of the chassis. The heat sink is also help on with screws that must be removed to get that board out. If you have any doubts about your skill level, you should just take it to an authorized Denon repair center as your first choice, if you have none near you, the best service center around would suffice. This is a very good receiver and it is well worth getting repaired. It would cost much more to replace it with a new one.

Let me know if I can be of further help to you.

Posted on Nov 09, 2008


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