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RCA Model STAV-3870 Receiver

I was playing loudly and after about an hour, it shut off. It will not come back on, only the standby light turns on, the relay clicks but nothing comes on, no display or sound. I checked the internal fuses and the 2 main rectifiers and they are good. I tested and it seems as if the main transformer may be the problem. Not getting any dc current output to the boards. Any ideas what can be done? Repair costs etc?

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Very likely that the internal thermal fuse opened on the main power transformer. With the power cord unplugged, Check the resistance on the ac input of the transformer should read less than 10 ohms. Contact me when you know. I might be able to find one.

Posted on Jan 20, 2009

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My onkyo HT RC330 will not power up at all. Have had problems past couple of months with starting it but if you played around with swith it would start. Now nothing.


Try resetting the AV receiver To reset the AV receiver to its factory defaults, turn it on and, while holding down VCR/DVR, press 8 ON/STANDBY. "Clear" will appear on the display and the AV receiver will enter Standby mode.

It is possible that the protection circuitry has been activated. Remove the power cord from the wall.. Disconnect all speaker cables and input sources, and then leave the AV receiver with its power cord disconnected for 1 hour. After that, reconnect only the power cord and set the volume to maximum. If the AV receiver stays on, set then the volume to minimum, disconnect the power cord, and reconnect your speakers and input sources. If the AV receiver turns off when you set the volume to maximum, disconnect the power cord, and contact your dealer.

If the standby light is lit it and the unit will not boot it is most likely that the protection circuit has been activated. If there is no standby light then check the fuses. These units check that the power supplies are operating near specification. If a capacitor or resistor in the circuit, or a broken solder connection the unit will shut down. Because of the temperature the thermal cycling around the power supplies a broken solder joint can occur. This will make for an intermittent operation.

Hope this helps.
26289825-owoa52fq3dbvw0lom3ojbzgr-3-0.jpg Failed resistor or capacitor


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26289825-owoa52fq3dbvw0lom3ojbzgr-3-5.jpg

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There are many issues that may be at play here. Most likely, you are experiencing DC Offset(meaning you have a damaged amplifier). For more information, please visit my website at audioserviceclinic.com. Thank you.

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Hi I'm George. my yamaha rx-v795ards after an hours playing or when a loud sound comes, it turns off. you turn it on and then goes off again


Hi George,

Here is something that you can do , or have someone to assist you.

Disconnect all speakers.

Power it On, If it turns On completely , Be glad.

Put back speaker one at a time to find the cause.

If for instance , it doesnt work ....


It may need servicing.

Let us know what you find out or post back if you feel you can DIY.

Good luck!

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