I was listening to my receiver one day and I heard I loud pop sound. The receiver then blinked PROTECT through the LCD reader. I unplugged it and all of the speakers and plugged them back in. It's still in the PROTECT mode. What could be the problem?
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Yes that is why. The receiver is protecting itself from an un-stable load impedance which causes current/voltage spikes through the final amplifier components and proportionally through the input where the protection relay is (click),. Do not continue using the amp until you have repaired or replaced the blown speakers. A rule of thumb is to maintain 8 ohms on each speaker wire plugged into the amp. Keep that in mind or eventually you will damage it.
Sounds as if you may have a bad speaker component that is causing the unit to go into a protection mode to protect the unit from shorted speakers/outputs. Try to unplug the speakers entirely and then turn on the unit...If it still does this and goes into standby with the speakers disconnected then there is a problem probably in the audio amplifier circuit that will need servicing by a technician. If the unit stays on..then I would try to put different speakers on the unit to see if it works..if so, then suspect your speakers...if not , then suspect the receiver
Firstly i suggest going into the Onkyo setup menu. Make sure that in "source settings" i think that's the menu option) that the input e.g. dvd is set to receive HDMI. then go into the settings for DVD and ensure that resolution is set to auto, then go into the monitor out settings (option 1 on main seyup menu) and make sure that main monitor out is set to HDMI and auto resolution.