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Re: Denon AVR 2802
If the display did not lit and power indicator is flashing rapidly------you will have short circuit in speakers cables -----turn it off and remove short circuit cable-------or you have block in ventilation holes---------turn power off and leave it to cool down and remove anything block ventilation holes---and turn it on again after cooling---------another solution-------on screen display is set to off on system setup------turn it to on in system setup.
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Try doing a factory reset by turning off main power switch.hold down speaker a and b buttons while turning on main power switch ,display will flash 3 time s then release buttons,this then returns unit to factory default settings.
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The way you describe you problem it seems more like poor solder connections somewhere on the board. Usually these are at the voltage regulators where there can be some heat. Also, look for any connections that appear to be grasiny or have rings and resolder them too.
Alternatively, suggest that you take it to the Denon service center closest to you.
check all speaker wires from the receiver end and the speaker ends. Just the smallest strand of copper could be touching something it should not be touching. Make sure all copper is in the speaker post and not hanging out. The receiver is getting a short and shutting off to protect it self. This could have happened since you were just plugging things in.