I had a setup using Yamaha RX-V775 receiver w/surround sound 7.1 that integrated a large TV, DVD player, integral Radio and a FireStick for stream-based video. It was working beautifully for over a year. I could access everything quite seamlessly without issue. A click of one button on my FireStick controller would turn on all required devices and bring the FireTV graphical user interface on my TV. It was working great until about 5 days ago when the power went down in the neighborhood for a couple hours. Now, I am not getting any audio out from my receiver and the devices don't turn on automatically as before.
Note that this outage did not occur during a storm or high winds.
I have played around with the configuration on the TV and receiver and nothing has fixed the loss of the audio output.
Any ideas?
Thanks
Unfortunately when the power goes out you get a big voltage spike. The physics of this is back EMF. This happens because the power comes from an inductive circuit, which is the transformers in the system, especially the one nearest your house. Also the transformers in the substation, but there is usually a voltage regulator between the substation and your local transformer.
Now the issue is that an inductive circuit always resists a sudden change in voltage. This is called back Electro Motive Force, or back EMF. In a big inductor like a your local transformer this back EMF is a very considerable voltage spike.
This is enough to damage equipment that has delicate micro processors and other ICs.
So if you value your equipment, I recommend whole house surge protection, which in a case like yours would probably not activate, but would in storms. Then powering fragile equipment from a fast acting UPS that controls under and under voltage and instantly switches to battery for events like yours and does a gentle power down. This would almost certainly have prevented your problem.
As recommended try a soft reset first. If this does not work do a hard reset back to factory defaults. You will have to do a set up from scratch after this.
If this fails then unfortunately some items of your equipment have likely suffered irreparable damage, most likely your receiver and may be the firestick.