Question about Denon AVR-3805 Receiver

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Lights Out!!! A while ago, my Denon AVR-3805 display went blank. If not for my remote, I could not figure out what it is doing. How can I fix the lighted disply on the face of the receiver? My wife, who does not like the remote and cannot operate it fully, is a frustrated puppy as she cannot look at the receiver to set it in the proper mode for TV, CD, DVD or Karaoke, and we all know what happens if the wife is not happy! LivingtheDream stb.

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We certainly do not want the wife upset. Been married over 27 years and I know what thats like!!!

You will need a multimeter to measure a few things to determain just what is causing this. It could be the flourescent display thats bad or it could be it is not getting the voltage supply to the display.

This display is supplied A/C from the main power transformer. If you look at the unit with the top off, you will see a set of wires that goes form the transformer to the smaller board on the display. It is should be 2 white and 2 brown.In the number 1 and 2 position you have the supply you are looking for, it should be the white wires. It should be an A/C voltage but I am not sure how much. I don't remember and the schematics don't say. I have seen A/C voltages as low as 5 or 6 volts and as high as 30 to 40 volts. Measure across the two white wires at the connector on the board and if you get anything more than just 3 or 4 volts A/C it is probably the right voltage. If you have no voltage there, you need the power transformer replaced. That is an exspensive part, normally well over $100 for Denon's.
If you have that voltage there, you need to check some components of the small square display board. Before I spend a lot of time telling you what and how to check these things, let me know if you have the proper tools to do the job. If you don't, you need to take it in to be checked by a professional technician.

You need a multimeter, soldering iron with solder and solder wick to remove solder form the board. You will most likely be replacing a part or two.

I hope you keep on living the dream, and this Denon doesn't turn into a nightmare for you.

Let me know if you want to really dig into this thing. I will help.

Dave

p.s. If you found this information helpful, a good rating of "FixYa" or "Helpful" would be appreciated. The other two ratings are bad ratings and only pulls the rating of an expert down.

Posted on Jul 04, 2008

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