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A surge protector may not be able to react fast enough to prevent damaging spikes from reaching the sensitive circuitry . You think of using Isolation stages for power. as for the amp plug in headphones to check if the audio DSP stages are intact.
You said you tried hooking the HDMI up directly from the TV to each component, and that worked. How is it usually hooked up - through some kind of switch? I'm not completely understanding your setup here.
Hi, Please reset Onkyo receiver that will solve noisy sound problem, to reset the receiver, press and hold Video-1 button on unit and press Speaker-A button. Display will show *Clear* that means receiver has been restore on default settings, turn it On and check sound. Hope this will help. Thanks.
If the protector is working the fault can vary from a very simple failure like a fuse in the power section to a major failure of the boards being cooked up.
so take a look into the set and replace the fuse or a surge protector in the mains or maybe the primary of the transformer.
If not there are many sides to this isssue.
If your receiver was connected to any power source and that power source was not a surge protector strip there may be damage to the receiver as lighting travels. Another thing to consider is the fact that many people will put their equipment on surge protectors but the cable is still connected to the TV etc...This is just another avenue for the lightning to get into the home and blow up your system. I always disconnect any cable from my computer and TV. The power source from the wall is also unplugged when there is a storm just to be sure. Surge protectors are limited in their use as well. I don't believe they can take too many lightning hits. It is best to change them out.