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I'm having the same problem with my Wii output. The manual for the Denon AVR-1312 says that analog video signals (i.e. component/composite outputs from the Wii) are not converted to digital video signals (i.e. HDMI output from the rcvr). I'm running only HDMI to a projector, so the video signal is essentially lost. The fix appears to be to run an additional composite cable all the way to the projector. Sounds like your fix is the same. No Wii tonight! :(
Are you using HDMI output? if so then there might be an issue with the reciever itself but try hooking a standard a/v cable to the output of your reciever and see if the wii comes up on that screen, then we can go from there.
At first consideration, the question appears a little vague. Any sound amplifier other than a simple two channel stereo system requires the appropriate driver signal(5.1, 6.1 et al ) in order to output sound to all speaker ports. If a stereo signal is fed in you will not get 5.1 or 6.1 or any other of the multiple speaker channel outputs from the speakers. The 5.1 or 6.1 etc. source signal must be provided on the medium you are playing or receiving for you to be able to hear it outputted on all speaker channels. If on the other hand you mean that "There is no sound whatever coming through any of the speaker ports no matter what you play into the amp" then the whole thing would need to be checked from input to output by a Technician to determine at which point the source signal is being lost on its way through the entire circuitry. In this case I would recommend you arrange for an fixed fee inspection which might include a minor repair up to that amount if that is what is found to be necessary.
connect your right speaker cable to the left output, if the sound comes out then the problem is on the left speaker ( the cable or the speaker itself ), but if still no sound, then the problem is on the power output of the unit, need to repair them
The main issue is to determine where the distortion is coming from. Does it start in the front and and get amplified or does it appear in the output section only? This will require a fixed signal and an oscilloscope to trace. Check for leaky coupling caps or leaky transistors in at the diff-amp section.
With the initial price of this being as high as it is, it is probably worth saving.
If you haven't checked all outputs, I would advise doing so since that would help localize a potential point of failure.
If NO outputs are still alive, it may be a failure of the main power supply of the unit; if this is the case, the repair may not be that costly.
If some outputs are still active, it could still be a power supply failure since it is probably not servicing all channels from a single supply.
Alternatively, it may be a failed output module with two channels in a shared housing.
Unit is going into protection mode because the amplifier output stage is shorted. Measure output voltage of the speaker lines coming out of each output channel...front/center/rear...take measurement before the channel speaker line protection relay. If any voltage is present then that is the output channel that is at fault. Replacement parts are available to the consumer through tritronicsinc.com. If you have experience with a volt meter\checking transistors\soldering it is something you can do. If not it should be left to a service shop. Have a great day!!
It's quite possible one of the relays is failing that is part of the switch between audio output choices. Do you notice any output difference between a certain output (i.e. dvd, tape etc)or is that point arbitrary?