Yamaha RX-v1500 intermittent power problem

SOURCE: receiver shutdown

There is whats called a protection circuit inside this receiver. This is what is supose to happen when the receiver detects a short in one or both of the output stages of the amp. Unless you have a service manual or have the know how to work on solid state receivers, my best advice is to take the unit into an authorized Yamaha repair depot and have them take a look at it, as they can hook up the receiver to a set of load resistors and run the amp to max capacity and see when the amp section of this receiver starts to clip and that will give them an idea of where your problem is. I'm afraid there is no fix that an end user of this receiver can do. Good Luck

SOURCE: Yamaha RX-V1500 Shuts down after 2 seconds

Asouth, I'm curious if you have solved the problem with your receivers? It sounds like the same problem that I am having with my RX-V1500. I would appreciate any response that you would have to this inquiry.

SOURCE: Yamaha RX-V1500 Shuts down after 2 seconds

This set is getting old and is in the Archives section of the Yamaha consumer guide area. But, you can still download the owners manual if you need one. If it is going into protection mode even when there are no speakers connected OR when the sound level is very, very low or zero it is not good news. Yes, unplugging the line cord will cause the protection system to reset itself. But, if it shuts itself off again soon after rebooting it is a sign of bad grease in the output stages -- in all probability. Let me explain: The audio output transistors are mounted to a large heatsink which keeps them cool during operation. They are electrically isolated from touching the heatsink by an electrical insulating washer. But, in order to keep them cool and allow for good thermal conductivity of the heat generated by the output transistors the washers are treated with a heat conducting grease. Over time this grease will dry out and lose its heat conductivity ability allowing the temperature of the transistors to rise; as the heat goes up they conduct more current and cause the protection system to activate and shut the set down (in order to avoid damage to the set). That is the most common cause of your symptoms. However, there are several other possibilities, but I give this explanation a 90% probability based on my experience.

SOURCE: RX-V1500- front panel lights not working

The display on an amp has two components.
A small Lamp (light bulb)
A LCD display with a color filter.
Normally when the display goes out the problem is with the lamp
The lamp on my RXV 870 died after about 9 years of use.
I called Yamaha and was able to by a replacement.
The lamp is an odd voltage 14.5 if I recall.

Looking at the receipt i should have bought 3 for the cost of shipping. It cost about 10.00 cnd,

SOURCE: My RX-V1500 Yamaha receiver shuts-off

Generally speaking, an amp protects 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 'naked'. 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.