My NAD T763 turns on but no sound comes out of any speakers
My wife said kids were watching a DVD movie when all of a sudden they heard a loud "pop" sound and the NAD receiver went out. Later on, I turned the off/on button on back of receiver on, and the unit turned on. Power to the unit seems to be o.k. now, but now there is no sound coming out of any of my speakers ( 2 fronts, center, 2 surround rear, and one subwoofer). A similar incident occured like this approximately 2 weeks prior. I came home from work turned the unit on and everything was fine. This time no sound coming out of speakers.
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Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'nekkid'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.
Check for loose speaker connections at the speaker as another possible root cause for intermittent shutdown.
probably one of your speakers has blown.. disconnect them all. turn the reciever on. if this works turn it off connect one speaker and turn it on.. keep going until it goes red... when you find the speaker discennect all the other speakers keep this one connected and confirm that it is this speaker giving issues.
if the amp doesn't come on with all speakers disconnected, remove the visual outs and start it with nothing connected. isolate the issue if this works. otherwise it might be your amp.
sounds like you have the polairity reversed on the speakers
and yes it does make a difference
check polairity also make sure unit is well ventelated
you wouldnt use your compouter if it was inside a card board box
so make sure the reciever can breath also
recievers get too hot and they start blowing chips off the board
This happens to many of those model. The problem is usually on the power board (if looking down into with the control panel facing your belly... it's the cluster of boards to the left, front of the unit. Look in the top, under the connectors. YOu sometimes have to dissassemble the thing alot to gety to it. Also, on the main board, under all the "cards" (the input/video circuit boards) and near the front (at the back of the cards) tere are heat sink mounted regulators that often need to be re-soldered.
The whole process is a pain, and can take a few hours to do properly, so most repair companies will charge accordingly. Yeah, it's a shame they made them like they did. If it's working, it's a good unit. Aside from these common failures.
Looks like you've got the best connection available - initially I thought it might have something to do with decoding the prologic signal from the analog input, but obviously not! And since you've got the audio separate from the video it is unlikely there is any interference from the video signal in the cable. Have you tried a different DVD player (I reckon that is most likely)? Also try connecting the video signal DIRECTLY from DVD to the TV if you aren't already doing so (you are anyway aren't you - the HTR 5660 doesn't have HDMI out does it?) Finally, if you have some spare cables around, try changing them - see if you get the same response when using component video cable instead of HDMI.
Hi there. Are you familiar with board level repair for such products ? Your problem is most likely hardware. Either some of the final output transistors are fried, or it's a dsp problem, a regulator, a diode, a transistor in the circuit.. it could be a lot of things. But if everything was working fine and it quit someday without a change in the system's setup, it really looks like an hardware issue !
Do you have a way in the manual, that sets factory defaults, a kind of reset ? A lot of such units do have that. Try to unplug/interchange speakers as well, a shorted speaker could make the amp go nuts as well, but i wouldn't bet on it. Still, i'd check that out.
Hope that helps ! cheebster.