I thought I'd share my Onkyo heat issues and how I've resolved it, eventually ending up with a TX NR809.
I started out with a TX NR708 - after about 18 months started having issues, ie. no sound when on BD/DVD, tried factory resets and powering on and off etc - some luck sometimes and eventually did not resolve it at all. Sent it back to the NZ distributor and they refloated the solder on the HDMI board - which means gently heating the board from underneath to resettle the solder for the processor and ensure its soldered connections are good. It turns out this is common with Onkyo receivers.
Got the receiver back and after about 2 months the issue came back. Sent it back again and the distributor said they'd contact Onkyo in Japan to get a replacement HDMI board. They could not get an ETA from Onkyo Japan on the board and offered to upgrade me to the TX NR809 for a price; and they'd eventually fix and sell the TX NR708. I took them up on the offer.
So ... the TX NR809 as any owner will know generates a lot of heat
, much like most Onkyo receivers. Even when in standby it still puts out a lot of heat. I've built a very nice cabinet for the audio-video equipment - it has no back, but has doors with cloth fronts. The receiver sits on one side of the cabinet with about 20cm space above it and about 10cm space around the sides. It still got scarily hot when on.
So .... I bought the fan below for $10 (NZ)
from our local trademe site, plugged it into the USB port and proped it up at one end - see pic. No elegant I know, but the door is always closed. I found that if you lie it flat on the top of the receiver the fan speed lowered as clearly it was struggling a bit to move the air. But if prop it up and probably because there is no back on the cabinet, it works perfectly. You can't hear it and after hours of use, the receiver remains cool. Oh - the fan has a built-in blue light that goes when its on. Not keen on it, its a bit naff, I might see if I can disconnect it maybe when I'm in the mood; and perhaps find a more elegant way of propping up the fan too.
However, the USB ports on the NR809 are "always powered" so to help save its life and the life of the receiver I found the device below - Clever Watts easy-off socket - while the socket is RF controlled, the pack comes with a small battery powered IR receiver that means you can use your Onkyo or any remote to operate the Easy Off IR receiver which communicates with the easy-off socket by RF. I had to search hi and low to find something like this - as didn't want to have another remote just to power the receiver on and off. So I've used the macro feature in the Onkyo remote to put the receiver into stanby before mains powering it off with the clever watts thing.
All works well - except I will say the Easy Off IR receiver unit is a bit poopy from time to time - it doesn't react to the remote sometimes - which is annoying when you have a macro set up to power all your stuff off and on. I was nearly going to return the thing - except I can't find anything else here in wee NZ or Australia that does the same thing. It must forget that its supposed to react to my remote control and switch the receiver off or on.
Hope this is useful as I've read a lot of forum messages about Onkyo heat issues and not all of us want to have the equipment on display in the open - I like to have it all hidden. So if someone finds a similar product I'd be interested and ditch the Easy Off thing. Cheers.
Have just learnt I cant add links yet and understand why - its those turdy poopy spammers. So:
Search amazon dot com for "Notebook Cooler 184mm"
Then for the IR controlled plug search:
jaycar dot co dot nz for "ir controlled wireless mains sockets"
or for those outside Australia and NZ I found the product on
www dot latestbuy dot com
Search for "easy off wireless mains sockets"