Question about Yamaha RX-V1500 Receiver
Hey all, I have a particular issue. I'd used a Yamaha RX-V1500 in my living room for about a year & one day it stopped working. The unit would turn on, but then immediately click off. I figured I had a short in one of the speaker wires or sub, and tested the unit without anything plugged in - same issue. On, 2 seconds, click off. I set the unit aside, and brought down my second RX-V1500 from my bedroom to try in the living room. This unit worked for about a week, then THE SAME THING HAPPENED - and it has been like that since. So I think I fried too amps. Any ideas? It is not hot in where the receiver is, and all the speakers tone fine. I understand how to fix things generally, but before I open these guys up, anyone know where to focus? Thanks.
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.
Posted on Jun 17, 2007
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.
Posted on Jun 06, 2007
I had a similar frustrating problem, the RX V1500 would simply turn off within a couple of seconds. Unplugged it for a full day, tried disconnecting all cables & inputs. Nothing made any difference. Just as I had resigned to write off this AVR with a heavy heart, I came across this site:
(Wish to deeply thank Daniel Campbell who has discovered this CPR remedy)
The solution given here has worked spot on for me. Like a new lease of life, almost a miraculous resurrection !! Do try it before sending your set for repairs or dumping it, hope it might work for you too.
Posted on Sep 16, 2013
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Jun 17, 2011 | Yamaha Audio & Video Receivers
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.
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