I have a LC-52LE810UN sharp aqous tv an i am trying to use the optical port to run the sound through my receiver system but the optical cable will not stay int he optical port of the tv. It will fall out when i move the tv to face the center of the room. should it snap in to place when i plug the cable into the port. i am using a ultra optical digital cable, toslink to toslink.

Sounds like a preamp circuit might be blown on the Sharp.

If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

Connecting to the Internet
To connect your TV to the Internet, you must have a broadband Internet connection.
Use an ETHERNET cable (commercially available) to connect the ETHERNET terminal on the TV to your
broadband router (commercially available).
If you do not have a broadband Internet connection, consult the store where you purchased your TV or ask your
Internet service provider or telephone company.

you need to have a cable connected to the ETHERNET port and then you will get more options. You need to connect it to your router ports. hopefully you have DHCP enabled on the router and then all will program automatically

Connect the optical audio out of your tv to the the optical in port of your receiver(under the digital in section at the back). It will give you the best quality sound and will vastly simplify the setup as you do not have too hook-up each device to the receiver independently as with this hook up, what ever plays on the tv will be output through the amplifier/HT system.

You need to complete an INIT first and then if that doesn't work get the unit serviced. Call 877-332-7867

you willprobavblyfind in the menu of the tv or dvd somewhere to turn on sound for hdmi

I have a similar problem. The Sharp TV aquos appears to be shutting down my blue ray player and dvd recorder when connected via HDMI. They work fine and never close down when I connect them via the rca cables either single video connection or a composite 3 cable rca lead. I have 3 HDMI inputs on the tv and the problem occurs on all 3. Any suggestions?

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

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.

This is basically a message for no signal on the tv, make sure the tv itself is on the correct input for the type of cable used. The inputs are labled by numbers on the back of the tv. The input can be changed by the button on the side panel of the tv.