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Re: Power will not stay on longer than 3 or 4 seconds
This unit is on protect mode meaning that a problem was detected in the final output stage. Try removing the speaker connections. If it still behaves the same way, the output transistors are most likely defective and will need to be replaced. The parts cost should be around $15-$25. Add in the local labor rate for the complete repair cost.
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Are you getting a standby light at all? Is it flashing? Do you here a click when you plug the unit in? If the answer is no to all of these then you blew a fuse. If you do have soome sort of standby light, then your set is in protect mode. More than likely for a blown channel. If no lights, but you ar egetting a click, you could have a bad transformer. Use a DVM and see if it is open or not. Good luck
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.
Did you try to reset the unit? Resetting the unit has fixed every problem I have ever had......turn off unit.....hold down A+B at the same time then turn the unit back on...hold buttons for roughly 3 seconds....Let me know if it works.
Try this, turn off the unit and remove the AC power cord from the electrical outlet, Hold the AUTO button and PCM button and plug the unit back into the electrical outlet, if the display starts flashing with 1 second intervals then release the 2 buttons, this initialized the microprocessor
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.