No output, loud buzz, fried voltage selector switch.

When the door is open the safety switch turns off power.
1. low voltage transformer may be the culprit. Also a bad fan relay.
very carfully with door off off close safety switch with a insulated probe touch transformer and listen for the buzz.
2. with the transformers it can be a common problem. Check for loose mounting screws.
www.goodmancooling.com

It looks as though you have ripple noise that amplifies into the output. First of all check if the mains voltage is going down to produce the low voltage hum. If not you will have to check the DC filter capacitors , couple in parallel to confirm the capacitor. IF the buzz is still coming through then you will have to isolate the preamp and wait it the fault is coming in. If not connect the preamp output to another amp to hear the same buzz to confirm the preamp to be faulty. If so you will have to trace by a voltage check when the buzz occurs to confirm if the preamp IC or the selector Ic is faulty. Some logic IC's can also produce this noise on static switching. If teh noise is appearing on both the channels, then I would still bet on the power section. So check once again on the rectifier/ regulators and capacitors. Hope this advice helps. Good day

The light means NOTHING other than a small voltage is getting to the unit. Verify the power supply is putting out the required voltage...

BUT FIRST...

A common cause of this is we forget which side is input and output... happens ALL the time, so verify you have the in and the out cables to the right placee.

If the previous repair included the replacing of the final amplification stage (output transistors or output amp-pac), I would look at the speaker itself. Perhaps there is a worn spot in the coil that under a particularly heavy load (loud), shorts out that channel. If not that, then there is the possibility that there is a problem further back in the amp stages that the outputs mask up to a certain point. This is all speculation, because measurements taken inside the unit are required to narrow this down. Can you list the parts replaced the last time? That might give me a few ideas.

Thanks,
Dan

well this may not be that helpful, but if you decide to give up, you can always run the sound through your surround system or plain old stereo, and there are many ways of doing this

Blank screen sounds like a fried thermosat. Abrupt outages can affect certain types of thermostats. Make a jumper wire and jump across R and G. See if you get any action from anywhere. If a fan or compressor kicks in you know you have a burned out thermosat...

Use Deoxit on the switch. It is a contact cleaner available at Radio Shack and Fry's. Exercise the knob well. It worked for me on my newly acquired Onkyo A809.

You have fried some of the circuitry take it to a service dealer and have what ever is fried up replaced...

As per the instruction manual the overload is there because of high volume condidtions and your over heating the unit. They recomend to turn down the volume shut off the reciver wait a few minutes and turn back on the unit with lower volumes. Second it states that the peaker wires or speakers could be shorted so make sure the speakers are good and the wires when you connected them to the reciver are not shorted. If all is hooked up properly then you have a problem in the output stage of the amp and its gonna need service unless you know how to replace the defective output devices? If not Go online at the addy I give you to find about service parts or service manuals.. Good Luck http://www.jvcservice.com