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The receiver's out put sections are grouped in pairs. Front left and right in one output, rear left and right in second output, and center channel and sub output on the third. Sounds like a semiconductor or semiconductors have gone bad in the center & sub output.
You have an internal short in your receiver could be power supply or most likely a output transister. There is a code to the blinking red light check your manual it may list the number of blinks with problem. However its not a simple fix. plus make sure HDMI cable is unplugged when reseting receiver if this cable has a short it may cause it to. Sorry to hear the bad news, nice receiver
The problem is not likely to be the switch itself. The unit is rpobably going into "protect" mode because of a problem internally. Try removing all the cables and try to turn on the unit. If the behavior remains the same, the output section requires repair. The most common failure is the output transistors. Expect a parts cost in the $40-$60 range.
The manual suggests disconnecting inputs and outputs and power, letting it sit for an hour, then plugging it back in and turning volume to max to see if it still shuts off. If it does, the problem is with the unit. If it doesn't, the problem is elsewhere.
Judging from some other sites, this is a common problem. If you take it to a dealer, suggest they check the AC input. Before anything else, make sure that there are no stray wires on your speakers connecting the positive and negative clips, which will cause a short and activate the amp protection.
I had the same problem with an Onky502 and replaced it today with an Onkyo606. It worked fine for an hour then started shutting off automatically. I'm following the manual and letting it cool off now for an hour, and meantime I'll check my speakers.
You might have a short somewhere behind the back of your receiver.Maybe a speaker wire sticks out and it is touching the back of the metal panel,or an RCA connection to a wrong input or output. It is common because when you are behind the receiver for so long,carelessness will cause you. A professional A/V troubleshoot expert could pin point certain connection to fix it for you,but in your case,it will be the best to unplug everything first,turn on the receiver by itself and see if there is anymore shut off;if it doesn't shut off after you have nothing that is connect to but only the power cord,i prove my point! Let me know, solutiondoct
Turn the power off. Wait about 10 seconds,then power up again get close to the reciever and listen for a click-not from the speakers ,fromthe recievers itself.If you hear a click,you can assume that the power supply is ok for that cercuit.This does'nt eliminate the power supply,but it will do for now.Put the speakers close to the reciever,what you will do now is to power up the reciever while listening to the speakers with the volume off.In about 3-5 seconds you should a hear a slight click from the speakers. Try this with both speakers if you don't plug in a pair of headphones to the headphone jack and play the source . If you still no sound with headphones you at least now know that the output transistors are not the problem or the only problem.The power amp., section are defected also.Message whatever happens.
This means that something is seriously wrong with the unit(blown amp, shorts, opens, etc.) however, you can reset the unit by unplugging the unit, holding the A and B channel buttons on the face of the unit and plugging in the reciever. the display should flash at 1 second intervals. if it doesn't stop flashing on its own then unplug and replug and you should be good to go! good luck.