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I am having the same issue as well. If you press "clear" "exit" and "surround mode" all at the same time, it will come back on. It seems to be an overheating issue. If you put a fan on it, it helps, but does not fix permanently. Anyone have any ideas for a permanent fix?
Given the heat/cold cycles of the storage area along with humidity, I would first suspect poor solder connections. This is not unusual for units of this age. A general overhaul should restore this to operation. This should be a labor only repair unless the output STK is bad. These units are known for having poor connections at the voltage regulators which cause a DC voltage offset triggering the protection circuit. The overhaul should address this as well.
the power supply in your DVD player may not have the proper voltage to the electronic switch and therefore the processor is in standby to protect the device. Or you may have a remote that has left the unit in standby mode. check the user manual to see if this is the fact. Checking manufacturers site in knowledge base usually has the solution for a "stand by mode" issue. Or call and talk to a technical support rep.
Unit is in protect mode there are a few problems that can trigger protect mode the most common is blown channel (shorted outputs). Sometimes one of the 15v regulators may go bad causing imbalance of supplys triggering protect mode. Also sometimes a bad solder connection could cause unit to go into protect also. I work for Denon authorzied repair center in Michigan if your nearby and Shipping to Michigan is economical let me know [email protected]
Bad caps in the power supply is causing this. C17 (10v,470uf), C17,c14 (10v,1000uf) and C18 (10v,470uf). Replace with same capacitance values but 25 volt rating 85 C. Just fixed mine half hour ago works great.