Question about Yamaha RX-V1500 Receiver

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Receiver shutdown Yamaha RX-V1500 shuts down after a few seconds. I followed troubleshooting guide to point of removing everything from the receiver except the power cord and it still shuts down. Bad power supply? I noticed I'm not the only on experiencing this, but there were no solutions given to the posted problem. Can you help?

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  • J R SMETHERS Jun 07, 2007

    Snakehead and Techman, I really appreciate your inputs. It is intuitive to me that this unit is defective by design and I should have "bewared" more. Would a thorough dusting or vacuuming do any harm or possibly help? The nearest Yamaha repair depot is 127 miles from here. Thanks

  • J R SMETHERS Jun 07, 2007

    I'm not electronics "savvy". I don't know what a power regulator is nor how to find one. I hoped to discover a simple solution such as a thorough cleaning. The machine is young and not oft used, and in my opinion should not be broke in an expensive machine like this.

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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:

http://www.avsforum.com/t/689793/help-yamaha-rx-v1500-avr-shuts-down-after-on-for-3-seconds
(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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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

Posted on Jun 07, 2007

  • Larry  Dillon
    Larry Dillon Jun 07, 2007

    Thanks for the poor rating my friend, you will still need to take, or send the unit into repair shop. It needs to be serviced, and unless you have any solid state repair knowledge and know how these amp circuits work, you can not do this repair, as there is also equipment you will need to troubleshoot this receiver. There is no magic wand I'm afraid to fix your problem. And no, dusting is perioticly will not help. Good Luck

  • Larry  Dillon
    Larry Dillon Jun 07, 2007

    Like I said before, These are solid state receivers and you cannot repair this unless you know how the power supply and the protection circuit works. I am sorry but there is no simple fix for this unit, and I have had, many times, a defective unit right out of the box. it does not make a differance if you used the receiver 2 times, or 100 times my friend, there is no time limet on how long these will last. I'm afraid there is no other options unless you take a quicki course in electronics and that would not be feasable. Maybe try contacting the manufacturer and see what they charge for a factory repair. good Luck

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Change your power regulator it is leaky and there are some diodes around the regulator change them also check the caps and some of the resistors some also can be faulty.good luck.

Posted on Jun 07, 2007

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Between the ground and the "PRD" pin of the CPU, there are three diodes: D503, D504 and D505. The first two seem to be useful to protect the CPU itself against any over-current. In case of short circuit or similar, these 2 diodes can easily blow out, and force to "0" the pin 139 voltage of the CPU ("PRD" pin, dedicated to detect any abnormal DC voltage from output transistors)
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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.

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