ONKYO HT-S790B - the receiver shuts off at high volume?

Question

I have an ONKYO HT-S790B receiver and the speakers that came with it for more than a year now. I have been very happy with its performance. But recently it has started to trip (powers off) while we are watching movie and have noticed this happeneing when there is a loud sound in the movie. We have to wait a while and then set the volume down before we can power it back and continue with the movie.

It has always worked fine at these volume levels before but only recently this problem has started. - Any ideas - what can be wrong - something that we can fix at our end?

Answer 1

It's shutting itself off, because the output current to the speaker is too high. One of a few things can be happening.

1. This is quite possibly it. Make sure that the speaker wires are connected well. Make sure they are inserted all the way. Also make sure that the bare metal is not touching each other. Also check for cracks in the speaker insulation that could cause a short.

2. It's also possible that the receiver is not working correctly.

Answer 2

ditto the other answers, but also, check the speaker boxes and make sure they are still tightly sealed and 100% sealed, years ago I purchased cheap speakers with crummy cabinets, this exact thing happened to me, I resealed the entire box and that was that.

Answer 3

Check to make sure your speaker Impedance ratings are not too low for your receiver, usually 6 -8 ohm, can handle 4ohm but will eventually overheat and shut itself down.

Answer 4

Receivers can shut down for various reasons.

-Heat. Ensure you have adequate ventilation and nothing is on top or preventing airflow around the unit.

-Short circuits. Check your wiring, Make sure all connections are tight and not touching, especially if you have recently moved or changed connections. Speakers can go bad also causing that specific channel to short out.

-Over driving the Amp. At very high volume levels receivers can "protect" themselves by temporally shutting down.

Answer 5

I agree with the other answers. The problem is probably caused by either a short or overdriving the amp. If this happens often, you should stop turning the receiver up too loud, as it can damage it. I blew out the output transistor and all 3 fuses on one of my receivers (it was 10 years old though). As was said before, check all the speaker connections on both ends, and don't turn the receiver up too loud.

Answer 6

I agree with both answers. Back track to things you may have done. Did you recently put it into a cabinet, or Put a DVD player or something on top? If you have a particularly dusty environment check inside to make sure the heat sinks are not all covered in dust. That will reduce their cooling ability. Vacuum them off or use canned air to blow the dust out. Check all your connections thoroughly as mentioned by the other guys.