Question about Denon AVR-3805 Receiver
I have been using this receiver for the past 2.5 years connected to DVD, STB, Foxtel and satellite to watch movies etc and to a projector using component. Last week, I could not get the video from all these components, although I got the audio from all the units. I tried various connections in the receiver (component, S Video, composite), but no picture output.
Also, is it necessary to upgrade firmware and if so, could you please let me know how I could get this firware and upgrade
Some of these Denons do require a firmware upgrade, but it is a very complicated process and you use your computer to do it thru the RS-232 port if this model has one. I can check on Monday to see if there are any for this model. I work at a authorized Denon repair center and fix lots of Denon receivers including this model. I just can't remember the specific details of every model of receiver I work on.
The only end user procedure you can try is the reset. If you try this reset procedure please be aware that all the settings you have made will be cleared and the unit will go back to the factory settings. You will need to input all of your custom settings.
This is no guarantee that it will solve your problem, but it may be worth trying. Sometimes the microprocessor software gets corrupted for unknown reasons, and a reset will clear out that type of problem.
With the power off you need to press and hold the "Pure Direct" and the "Direct" buttons on the front of the receiver and keep holding them in at the same time, then you would turn the power on while still holding those two buttons in. Once the unit turns on and you see and hear it turn on you can let go of the two buttons you have been holding in. Your receiver should now be reset, go ahead and make sure you assign the proper video inputs to the source you are using for the TV. Your owners manual should explain this. If you need help with it let me know and Monday I can look it up.
If this does not help you probably have a problem on the video input board, it has several IC's for switching and a buffer IC as well. It is controlled by the main system microprocessor also. The actual problem could be any one of those or even a bad voltage regualtor or transistor. It is not anything that the end user can repair unless they have experience in electronic trouble shooting. it also requires the proper equipment to troubleshoot with.
If you have found this information to be valid and useful, a "FixYa" ratings would be appreciated. That is the only reward I get for the help I offer here.
Posted on Jun 28, 2008
seems like i have the same problem. where can i get the firmware? is it only available via denon repair centers?
Posted on Jan 20, 2010
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Posted on Jan 02, 2017
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