No audio output device installed and the screen goes off when connected to a projector

1) Check that the plug is tightened into the device and projector. 2) check the prongs on the plug. Are any bent or missing? If so, get a new cable.

Tip: If you can move up to the next plug level, that could help too. So if you are using RGB, try a DVI cable if your projector takes it and your device outputs it. Other connections include are the Display Port and HDMI. They are on par with DVI, but they can deliver audio. Again that is only if the projector accepts it and sound can be played through the projector.

from the back of the tv player it will connect to the projector on the big screen usig rca leads

What you would have to do is connect the video output of the wii directly to the video input of the bug projector. Also connect the audio cables to it as well. Then connect an audio cable to the projector's audio out or otherwise labeled as "variable out" then connect the other end of that to the matching input terminal, found often labeled as "audio in" on the receiver's grouping of input selections for TV.
Then, on the projector, select the video mode you connected the wii cables to.

Semantics maybe, but sources are INputs. OUTputs are speakers, audio to other devices.

A DVD is always an INPUT.

So what's different? IOW, how are the DVD and Projector (Really? It uses a video OUTput) connected for audio? Have you looked at the manuals? Digital sources must be assigned, for example.

connect the TV monitor composite output (yellow rca socket) to the yellow video2 socket on the projector.

connect the TV red and white audio outputs to a stereo to mono adapter and take the single lead from the adapter mono output to the audio in on the projector

The trigger has nothing to do with audio and is to activate another device with a 12v signal, for example the screen. If you run the trigger into an audio device you'll probably kill it.

There are NO audio capabilities in this unit.

Page EN-7, EN-11, EN-24

http://www.retrevo.com/support/Mitsubishi-HC5000-Projectors-manual/id/599ag205/t/2/

Caution:

Do not use the signal output from the TRIGGER terminal as a power for other devices.

Do not link the TRIGGER terminal with an audio terminal of other device because that device may

be damaged.

The rated current for the TRIGGER terminal is 200 mA. If you use a current exceeding this rating,

a failure may occur.

For information about electric screens, please contact screen manufacturers.

Goof information. Have you eliminated or proven the Onkyo as a cause by going direct to the projector? Try another Input and/or Output. It's best to know which component is broken and if it's limited to a specific subset of its function.

Settings are also indicated. Run through the video setup again. If it just stopped, what preceded it?

A TV is meant as a video display device, not a source. As such, it might have an audio output to run to something like a home theater amplifier, but it would be a truly rare TV that has a video output as well.

What you should do is connect another device such as a VCR that can act as a TV tuner. You can run the VCR's video and audio outputs to the projector, tune in the channel you want to watch with the VCR's tuner, and you're all set. If you're on a digital cable system and have a converter box, you can use the outputs from the converter box instead of bothering with the VCR.

1. Connect your set-top box HDMI output to the Xbox One HDMI input.
2. Connect the Xbox One HDMI output to your A/V HDMI input.
3. Connect your A/V HDMI output to the HDMI input on your TV.
4. Notes
   
5. This option requires that all devices support audio over HDMI.
6. Surround sound from your set-top box will not be passed through the Xbox One.
7. When you perform this kind of basic setup with an A/V receiver, you're passing both audio and video through another device. Depending on your equipment, there's a small risk of audio or video lag.
8. Connect your set-top box HDMI output to the Xbox One HDMI input.
9. Connect the Xbox One HDMI output to the HDMI input on your TV.
10. Connect the audio output from the TV to the audio input on the sound bar using either HDMI or optical S/PDIF cables.

Laptops with a VGA output on the back shouldn?t need any type of ?device? for the projector to work. If its displaying an image with odd colors I would suspect a problem with the projector or the cable that connects them. The easiest way to determine if it?s the projector/cable or the laptop is try connecting it to another PC or laptop.