20 Most Recent Yamaha RX-V459 Receiver Questions & Answers

Disconnect the speaker one at a time, you may have a shorted voice coil, the message was indicated a short in the speaker wiring. If no joy then you may have burned out the power transistors.

hai risolto?

Thermal sensor is going to be a small 3-pin transistor-looking part that is attached to the power supply board and is pressed against the heatsink. Could be something as simple as bad solder connections on this sensor or the sensor might need to be replaced.

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.

I used to get noise as well. It turned out to be that one of the cables to the speakers was loose. Try tightening the cable connections to the Yamaha and to the speakers.

Yes, the cable box should/could be treated as any other digital audio device. The video could also be run directly to the TV as it doesn't actually improve from being routed to/through the Yamaha, does it?

The labeling on a given input is irrelevant (except for "PHONO", which is literal and exclusively for a turntable).

No, why? It's more hype than actual improvement.

http://forums.audioholics.com/forums/archive/index.php/t-1223.html

6.1 stands for six speakers and one sub-woofer - a total of seven actual speakers giving you the surround sound effect. Before it can play a surround sound environment, the media - a CD or DVD must have it encoded on the disc, like a movie that has 6.1 surround sound recorded on it or a music CD with recorded surround sound. Otherwise, it will just play stereo audio - two speakers and the others are redundant. And yes, it does sound better as if you are in the actual area it was produced - like if you were there.

If it won't turn on with NO speaker wires attached, it will probably need a technician to look at it.