WAS SOUND - NOW NO SOUND AT ALL - NO OUTPUT.
SOUND WAS OK THEN I WENT AND PURCHASED NEW RCA CABLES AND INSTALLED THEM.
WORKED GREAT !!!
TURNED UNIT OFF.
NEXT DAY WENT TO TURN ON AND NOW I HAVE NO SOUND AT ALL.
I PUT OLD CABLES BACK ON AND STILL NOTHING.
We found that the protector came on and we searched for a solution, however we could not find anything that fixed it. Finally we found that some of the wires for one of our speakers were touching and adjusting those wires solved the problem.
On 5.1 receivers, some inputs can be switched to Digital/Optical/Coaxial instead of Analog (RCA cables) - look for an Input Mode button.
If this doesn't help, turn the unit off, then power it on. If you don't hear a click 3 to 7 seconds after turning it on, it may be in Protect mode, and simply be a coincedence that it failed after installing the new cables. This can be caused by several things, most of which require in-shop service.
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Without knowing more about the subwoofer (powered, passive, what kind(s) of input it takes, I have to take a wild guess. Most powered subwoofers use the old standard RCA cable. I there are two jacks on the sub for Left and Right input you just get an adapter to make the cable plug into two jacks.
If I remember this model correctly, there is only 1 direct input. The remainder of the inputs are bufferred through a switching IC. It is likely that this IC is defective. Are there any other symptoms at all?