Question about Yamaha RX-V420 Receiver

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Yamaha RX-V420 No power

This receiver died on day. I have checked the fuses and they are fine. There is power to the power supply board. The standby transformer has the correct voltage, the main transformer has no voltage on the output. But when you press the power button, nothing. No lights, no clicks nothing. Anyone with any ideas? Any checks i can do?

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  • bambang_wid2 Nov 06, 2008

    I have the same problem and same indication with my Yamaha RX-V2090.

  • Anonymous Nov 22, 2008

    liugygçliuglboihç;o

  • dude998866 May 11, 2010

    I have the same unit with the same issue. I checked the voltage across the small trans former on the power board (which I assume is the standby power feed) and on the side with two terminals I could only read 0.5 volts accross them Is this within spec? if not what should I check next?

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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

Posted on May 12, 2008

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