Question about Yamaha RX-V420 Receiver

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Yamaha RX-V420 Will Not Power up

Last week I had the music nice and loud for a few hours and it shut down. I have unpluged everything and tryed to power it up and it only makes a clicking noise from a little red component just behind what looks to be the main power pack. I can only see one small fuse that i can see and it is fine other than that i dont know. Regards Daniel

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  • Anonymous May 12, 2009

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Hi Daniel if your set does not have a fan that trips on when the volume gets louder surely the audio output will damage. every working component generates heat and when the heat sore up to an uncontrolable level it cause damage.have a tech look on your set to repair it.good luck.

Posted on Apr 26, 2007

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Oct 21, 2008 | Yamaha RX-V420 Receiver

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Yamaha RX-V420 No power


If the standby voltage exists, the next step is to see whether or not the clock is working. Find the main micro chip. There should be a 3 legged crystal close by. You should see this oscillate (use a scope). No oscillation = no micro control = no turn on. It is possible that the micro is bad or the crysal is bad. Also, check to be sure that the output transistors are not shorted. It is also possible that these are preventing the system from turning on.
Dan

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