Once the Denon amp has been for 15-30 mins horizontal purple bars appear on the screen. These tend to oscilate up or down slowly. Sometimes they stop, other times just continue throughout the whole usage. Sometimes a light tap on the amp stops them, temporarily.I was wondering if it was to do with heat build up on the heat sink from a incorrectly operating fan?
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Re: Horizontal Purple bars appear on monitor
Heat sinks get hot....thats what they are there for. Are you using the composite, S, or Component video ?
Composite or S :.....The board for these is right next to the heatsink. It may very well be that the heatsink has "cooked" the solder on this board, and now it is intermittant. More likely is that there is a suspect solder connection that was there from the factory from day 1. I would get a shop to look at it, unless you are very handy with a screwdriver and a low wattage soldering iron. Be forewarned, the connectors for these boards that connect them to the main circuit board on the bottom of the unit are SUPER FLAKY and taking it apart might cause more problems.
Component Video:...THe component video is on the power side of the unit and if very easily accessable. Again, IF you are handy with a soldering iron and a screwdriver, I would unplug the unit, remove the top cover and re-solder the component video board, starting with the connections on the RCA jacks where the component cables plug in. If you dont feel comfortable doing that, leave it to a shop...in any casem the bill should be minimal......good luck....rob
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I had this same issue. I think I finally resolved the issue by turning off HDMI Control (HDMI-CEC) on my Blu-Ray player. I had the Blu-Ray player plugged into a Yamaha RX-V375 (almost an identical receiver). I think the source of the issue was that my TV does not not support HDMI-CEC. Turning off HDMI-CEC on the Blu-Ray player fixed the issue. The Yamaha receiver already had HDMI Control disabled, and all the other HDMI devices appeared to have HDMI-CEC disabled or not supported.
In my case, the symptoms of the issue were that I would see the correct picture for a second on power up, then the picture would go away. For the Blu-Ray HDMI input selected on the receiver, I would see a solid purple screen and a blank screen for the rest of the inputs. Sometimes switching inputs fixed the issue, sometimes power cycling would fix it, but it was getting very annoying.
Try connecting to the yellow RCA monitor output on the amp and corresponding input on the TV. This works for me. You could also try the composite outputs on the amp. This is one flaw the amp has that the setup screen will not display through the HDMI connection.
replace all the electrolytic capacitors in the power supply. i had the
exact same problem with mine and once i replaced the capacitors it
powered up and stayed on and worked perfect. these capacitors tend to fail as they're of poor quality. this fault is very common on denon receivers, especially the later models.
The Denon AVR-2801 receiver outputs the "on-screen" menu and interface with priority to the S-VIDEO output of the unit.
If you have any S-VIDEO cables plugged in, you will need to navigate to the appropriate S-VIDEO input on your television/monitor to be able to see the on-screen menus.
If you need additional help, please feel free to leave a message here and here is a link to the manual that explains the menu and on-screen functions in more depth. Especially see the "notes" section on page 14. I have had several of these Denon amps and the only input I could get the "on-screen" menu was the S-VIDEO MONITOR input.