I had the same problem. It's a voltage regulator (maybe 7812 or 7912) problem. In my case the problem was cracked soldering joints on the little PCB where the IC was soldered. Try this: open the case; on the sides of the big heatsink are attacched 2 IC Voltage Regulators. Check these ones for properly solder. After that I can power up my amp without problems.
I have another problem: now my surround speaker and sub are very very low volume even at 100%. Can someone help me?
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The amp protection circuit has been activated. Remove the power cord from the wall outlet immediately. Disconnect all speaker cables and input sources, and leave the AV receiver with its power cord disconnected for 1 hour. After that, reconnect the power cord and reconnect an input and a pair of speaker wires onto the unit. If the receiver still does not turn on than you will have to bring it in for service. Turn up the volume and if the receiver doesn't shut down, power off the receiver and add another pair of speakers. Power up the unit again and turn up the volume. If it doesn't shut down, power off the unit again. Now connect all your input sources and turn on your receiver. If the unit shuts down again, your unit will need to be further serviced at an authorized Onkyo service center.
Sounds like either a blown mainpower fuse or the thermal fuse for the power transformer. If the protect circuit was kicking in, the display would light up, but then turn off with a red blinking light. the green light with no display means the transformer is not getting power.
If there is no standby light. Open the top cover and check the fuse on the primary power side. MAKE SURE THE POWER CORD IS UNPLUGGED.There are two transformers in this model. A small one for standby and a large one for the main section.A relay clicks when you touch the power button and switches on the large transformer and the display comes on. If there is any problem in the output stage the the relay will click and the system will go into standby again.
Disconnect the speakers and see what happens. Carefully examine the speaker cables for unwanted connections (shorts).
Take a clue from when the power problem appeared. Something was moved and made the buzz a (probable) dead short.
the unit has sensed an internal fault and shut down or the start up relay has failed in pin #3 inside the unit you will need a service tech to help, if its new the unit is under warranty, the other common cause can be a speaker short in the back, in the wiring or worse at one of the speakers, my new unit had the same problem twice, once for the relay and once because the unit error self test did not like the unit in 6.1 configuration with the left rear surround speaker, holding the power knob down on start up for 10seconds kicks in the auto self diagnostics mode good luck
There is or seems to be a bad or cold solder connection on that Printed circuit board that is going to need to be resoldered or it can cause more damage to the unit. And on this model, the fan will start at power up but shut down untill the output section heat sinks get hot.