20 Most Recent Yamaha RX-V1500 Receiver Questions & Answers


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)
This is the reason why the protection circuit shuts-off the unit, even if the faulty power transistors have been replaced

Diodes are normal surface-mounted 1SS355: I've replaced them with two 1N4146, and everything works perfectly now.
Diodes are located in the "Function" board, at the left side of the unit: they are easily accessible

I've realized that the problems seems to be extremely common for this model, so I hope that this hint will be useful in several cases

Yamaha RX-V1500... | Answered on Dec 19, 2017


your set needs a tech due to excessive voltage the regulator got very hot causing it to damage when opperating systems a fan is needed to cool it off.goodluck.

Yamaha RX-V1500... | Answered on Jan 17, 2014


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.

Yamaha RX-V1500... | Answered on Sep 16, 2013


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.

Yamaha RX-V1500... | Answered on Sep 16, 2013


Read this procedure to possibly fix the remote:
http://remotes.com/remotes/servlet/rs?a=Display&contents=help_deadremote&uuid=A12963989782821
They also sell replacement remotes.
Zoom in on the picture of the original remote provided on the site (or look at your own) and get the actual remote model number.

or check eBay: search for "(model of the device or the remote) remote", check the 'include description' box. Usually cheaper than the vendors.

Yamaha RX-V1500... | Answered on Sep 20, 2011


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.

Yamaha RX-V1500... | Answered on Apr 12, 2011


Generally speaking, an amp protects itself from heat, shorts and overloads.


Overloads can be from excessive periods of high output 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 hands-on tech.

Yamaha RX-V1500... | Answered on Jan 30, 2011


Yes that is very possible! the wires and speakers need to be checked very carefully for any shorts. The wire should be inspected for any cracks or breaks that would expose the wire, the speakers need to be checked with a multimeter one by one for any odd readings, and last they should be checked for sound quality with a test amp to see if there is any distortion. If the technician has repaired the unit three times I'am surprised he has not looked at the other items. I think you should take the wires and speakers and request he do a load test to rule them out.

Yamaha RX-V1500... | Answered on Jan 19, 2011


Check ALL connections as this sounds like an open circuit. check cables to and from all units and speakers.

Yamaha RX-V1500... | Answered on Jul 26, 2010


open casing, check fuse in power circuits block

Yamaha RX-V1500... | Answered on Jul 02, 2010


Your Yamaha RX-V1600 has an audio output transistors are mounted to a large heat sink which keeps them cool during operation. They are electrically isolated from touching the heat sink 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).

You need to check or replace the transistor that's on the heat sink. Or you may contact a pro to replace it for you.

Good luck!

Yamaha RX-V1500... | Answered on Mar 14, 2010


When the unit functions correctly, you should hear 2 clicks. The first is the power relay that "starts" the unit. The second is the speaker protection relay that will kick in the speaker connection. If you do not hear the second click, the unit is in protect mode. This means that a problem was detected in the amp section and the unit is prevented from connecting the speakers. This is done to prevent further damage. Typically the output transistors fail and cause this. Expect a parts cost in the $25-$50 range for this repair.

Dan

Yamaha RX-V1500... | Answered on Sep 30, 2009


Replace the filter capacitors of the power supply

Yamaha RX-V1500... | Answered on Aug 29, 2009

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