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Try to unplug the powe cable from electric current for half or an hour then replug,
Does ur tv have a reset button hidden somewhere? Press it , sometimes some machines need to push this button to restart working fine again Incase ther was a shortage or something.
What's your brand name and model no.
The protection feature on these units will shut off the receiver when there is too much power draw or when a speaker wire is touching another wire. First, check all of your speaker connections and make sure the wires are nicely twisted and inserted into the speaker and receiver with no stray wires touching. Secondly, if this doesn't correct the problem, try going into your speaker settings menu on your receiver and select "small" for each speaker. Let your sub handle the bass. The sub cable should have no effect on the protection feature of the receiver. The speaker wires, however, are the most common culprit of a receiver turning off (protector). Hope this helps.
Plug the TV to an open channel on your receiver via this output: *Rear, 1 x Digital audio output (coaxial) ( TOSLINK ) This will look like a single RCA output plug. Set that input channel on your receiver to some sort of virtual surround mode because it doesn't look like your HDTV has a decoder in it (meaning it will come out stereo and the receiver will have to fake it). Turn the volume all the way down on the TV and use the receiver to control TV volume just as you do with DVDs.
*Substitute this with the digital audio output on your set top box if you are sending video only to the TV from the set top box (component, DVI or s-video connections). So video goes to the TV, audio to the receiver.
I have a sr605 Onkyo receiver and just hooked it up to a new Mitsubishi 73" and I could not get the picture to work, sound did though. Here is the problem the Onkyo is HDMI 1.3 but TV calls for HDMI 1.3a. There is a big difference between the 2 and the Onkyo will not work with TV. The newer model TV'S say in the manual Category 2 V 1.3a. You need to make sure that all your parts are compatable. It makes a big difference.
If you had the Speakers Set to A (not B) and no headphones connected when you pressed the TEST TONE button on the Onkyo HT-R540 (also known as the HTS-790) remote, and you had no sound from the Center Speaker then try the following steps.
1) Check the Center Speaker wiring at both ends under a bright light and make sure that there is not a strand of wire touching the Receiver Chassis or another speaker post. Check both + and - .
If that looks okay,
2) unscrew the Center Speaker Post connections on the Receiver and verify that the bare stripped wire is making contact. Often, the insulation is too far into the connector. When screwed down, the wire's insulation is crushed and keeps the bare wire from making contact.
If this looks okay and the unit is under Warranty, your last test is to:
3) temporarily swap the wires from the Center Speaker with the Right Front Speaker. Turn the volume down low and try the TEST TONE button again.
If you now hear sound from the Center Speaker box itself and none from the Right Speaker box, then the Receiver is the problem.
If you still do not hear sound from the Center Speaker box, then the Center speaker itself is defective.