Denon AVR-X2400H Intermittent Protection Mode on startup
Apologies for the incoming wall of text.
Whenever my Denon AVR-X2400H receiver has been off for several hours most regularly in the morning, it will often go into protection mode on start. This has been happening for months.
After anywhere from a minute to 20 minutes, after many restarts/moving the unit around/swearing, it will start normally and function without issue for hours until the next long period of being off.
It is the dreaded PRT: DC. During this period of protection mode, it will fail to start even if I disconnect everything but power. I have swapped the power cables, tried different outlets, and let it get plenty of airflow though if it were temp related it would be a different code / not happen on first startup.
I even opened up the unit, disassembled it and looked for moisture/scorch marks/loose cables before re-assembling. I have performed a couple factory resets over the last couple months.
I assume the intermittent startup nature hints at a failing but not failed part, but am not sure what to replace. I have access to an engineer friend / multimeter if helpful.
It is well out of warranty, but there's a part of me that wants to believe it can be salvaged, especially given current AVR prices.
Other things I have tried include leaving it in ECO/network standby. There was a period where spinning the source wheel on startup would cause the AVR to lock up but not trigger protection, after which unplugging/replugging would allow it to start normally. Not exactly scientific.
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This is a protection mode. The receiver protection circuit detects an internal problem like missing power supply voltage or blown channel and shuts down the receiver. You need to bring the unit to a repair facility.
Not familiar with this model but seems like the protection circuit is kicking in, this could be caused by an imbalance of Ohms between channels or a short. remove & check all speakers and cables for continuity or shorts, does the unit power on without speakers or in a different mode (surround off).
always add speakers in pairs (L&R) before testing to prevent possible protection circuit, test main speaker pair first then add surrounds (all according to the allowable Ohms range for the amp of course)
Remove all speakers cables or wires and check all from behind the Receiver. if there are any loose terminals or any metal object in between the terminals.
though it might be a coincidence that you have a problem in the Receiver.
unplug the power cable from the wall socket and remove all cables.
after you remove the cables plug the power cable in the wall socket and try if you see the protection displayed , the receiver needs service.
Probably some speaker wires got shorted or the output stages freaked out and the cpu went into protect mode. Normally plugging it out of and in to the wall socket should/could reset it.
First check all wiring at the speaker outputs and on the speakers then if it still wont startup you could try the avr-1500 method with some trial and error pressing of buttons.
avr-1500 reset method: Unplug the unit from the wall, hold down both video select and audio
select at the same time, plug it back in. Keep holding both buttons for
2 secs, unit will reboot. As you have no audio select button on your avr-1100 you might try pressing video select and another key to see if this will reboot it.
I am a Tech in Michigan and have worked on lots and Lots of Denon AV Receivers. These units have Protection circuits for Overcurrent, Dc Protect, 15v Regulator inbalance, Rail Voltage Inbalance, Low Ac Voltage, Low Standby Voltage and Thermal Protection just to name the ones I remember. My guess is you Probably have either Poor Intermittent solder connections or Amp is not Ventillating Properly. Make sure you leave room above Receiver to Vent and You are using no Less then 6 ohm speaker Impedance per ch. Refer to Speaker Impedance chart on back panel . [email protected]