Question about Yamaha RX-V420 Receiver
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?
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.
Posted on May 12, 2008
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