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I have a Onkyo HT780 that is overheating?

  • Thread starter Thread starter Deleted member 4644
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Deleted member 4644

Note: system is connected to my computer using radio shack 1/8" to RCA cables.

So I noticed my system ran hot and had very thin wires, so I tried replacing them with 16ga wire. Got that all hooked up a few weeks ago...

Unfortunately, it still runs EXTREMELY hot. So hot that it could burn my hand if I left it there for 20 seconds or more. Is it the wire I'm using? The computer hook up? Defective unit? I have a 3 yr frys return policy on this thing.. maybe I'll be glad I got that... 🙁

Short of rigging an air-cooling system for this, what can I do?

edit: there is also a LOT of static that randomly "pops" out of the speakers, esp if nothing else is playing on them. I should have mentioned that.
 
Do you have some airflow going around it or is it closed inside something / has something on top of it?
 
Originally posted by: YOyoYOhowsDAjello
Do you have some airflow going around it or is it closed inside something / has something on top of it?
Click to expand...


It is 100% unrestricted airflow. The room is warmish (~70 F) but nothing out of the ordinary. It gets damn hot even if the room is cooled down too.

Oh, there is also a LOT of static that randomly "pops" out of the speakers, esp if nothing else is playing on them. I should have mentioned that.
 
Originally posted by: YOyoYOhowsDAjello
Check your speaker wire connections. You might have a short somewhere.
Click to expand...

Looked at them, they seem fine. I did try tightening the wire posts, a couple of em were fairly loose, but should have been a "normal" connection. No change from what I can tell.
 
Originally posted by: YOyoYOhowsDAjello
Have the pops and crackles always been there?
Click to expand...


No, to be honest I think they got worse/started when I started using the new wire, although I seem to remember that maybe they had started the day before -- one of the reasons I went to get the new wire.. that and the heat.

Also, cracking is only on the side speakers, the fronts and center is ok.
 
Yes, check for shorts at your connection points. You also don't want to overload the amplifer by hooking up too many speakers to one channel. The lowest ohms rating that is safe for many home receivers is 4 ohms. Anything lower and it's drawing way too much current and causing the excess heat.
 
Maybe try disconnecting your side and rear speakers. Play stuff on just the fronts and center for a while and see if the amp gets really hot still or if it's cool.
 
Originally posted by: YOyoYOhowsDAjello
Maybe try disconnecting your side and rear speakers. Play stuff on just the fronts and center for a while and see if the amp gets really hot still or if it's cool.
Click to expand...

Do I have to "tell" the amp I've disc the speakers, or will it know?
 
Originally posted by: LordSegan
Originally posted by: YOyoYOhowsDAjello
Maybe try disconnecting your side and rear speakers. Play stuff on just the fronts and center for a while and see if the amp gets really hot still or if it's cool.
Click to expand...

Do I have to "tell" the amp I've disc the speakers, or will it know?
Click to expand...

I'm just trying to narrow down shorting out problems / defective speakers. If the system works normally with only 3 speakers attached, then it's probably an issue with something in the surrounds and rears. If it's still hot as hell with only 3 speakers attached, then it's probably something generally wrong with it.

You don't need to tell it you disconnected them.

Has the receiver ever shut down from being too hot / driven too hard?
 
Originally posted by: YOyoYOhowsDAjello
Originally posted by: LordSegan
Originally posted by: YOyoYOhowsDAjello
Maybe try disconnecting your side and rear speakers. Play stuff on just the fronts and center for a while and see if the amp gets really hot still or if it's cool.
Click to expand...

Do I have to "tell" the amp I've disc the speakers, or will it know?
Click to expand...

I'm just trying to narrow down shorting out problems / defective speakers. If the system works normally with only 3 speakers attached, then it's probably an issue with something in the surrounds and rears. If it's still hot as hell with only 3 speakers attached, then it's probably something generally wrong with it.

You don't need to tell it you disconnected them.

Has the receiver ever shut down from being too hot / driven too hard?
Click to expand...

No shut down.. maybe I am just being paranoid, but this is about 100x hotter than a 600W Sony I used to have. Also, the static issue kind of sucks. I might just RMA it to Frys if I cant figure it out soon.
 
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