Where do plug the fiber optic cable on a sharp 3d/led 60in. hdtv?

SOURCE: Vizio 42" LCD HDTV - sound went out

Same thing just happened to me contacted Vizio had me unplug the TV from the wall for about a minute and then replug and cut the TV back on and everything was fine. I have the television hooked into HDMI1.

SOURCE: No surround sound when attaching hdmi to TV

Try running the optical TOSLINK cable from the TV to the receiver. If the TV doen't have a digital optical output, then try going into the menu on your cable box and setting the audio output to the digital optical out. Also check your TV menu and make sure NETCOMMAND is diabled. Some of your newer HDTV have Netcommand that allows the TV to control other devices through the HDMI cable.

SOURCE: connecting external speakers with optical cable

Id say you DO NEED to adjust your TVs audio settings.

SOURCE: No Digital Audio From Sharp LC-37D64U

Try changing the the Audio Setup in the Digital Setup Menu.
If you have your manual, go to pg 11 and pg 28 for Digital Audio Output. If you need a copy of your manual, here's the link.
http://www.sharpusa.com/products/TypeManuals/0,1083,127,00.html
Page 11 has info on the problem and page 28 to solve it.
If that doesn't work, I would try downloading the latest software to fix is problem. Page 28
http://www.sharpusa.com/products/support/options/1,2310,,00.html?model_num=LC-37D64U&s_func_disp_id=27&x=42&y=11

SOURCE: WD-73837 73 in. HDTV TV: hook up the coaxial cable from the tv to the recei...

7.1 surround sound will not work with a coax connection OR Composite (yellow video with Red and White audio). You either need to use an HDMI cable or the Component connection (Red, Green, and Blue connection along with the Red and White audio or the optical audio connection).