Lg 8500 tv and hursk 18 rear speaker kit. I have connect using optical cable. TV will not pair with transmitter. It does a search but doesn't find it

You have to go to setting and change the audio output to TV speakers for the TV speakers to work,, but, if you use a sound bar with optical connection...you have to set it also .. mine works the same way,,

I suspect that the TV you have does not support the ARC function that the sound bar has. What you may have to do is use the Optical In from the sound bar to the TV and you should be good to go. You may have to change the TV's settings to use the Optical In though. So you should end up with the BluRay Player connected to the TV via an HDMI cable, the sound bar connected to the TV via the Optical In using a fiber optic cable. Hope this helps.

You can use stantard audio cables or a optical audio cable either way you must have a reciever

Ensure that you have an audio connection to your LG theater system from the TV, that is labeled as "audio out" or similar to "variable out" to an audio input on the LG system. You may use a pair of RCA type cables or sometimes known as composite audio cables. Then on the LG system, select the input to use that you connected your audio cables from the TV into. Disable the TV speakers. Decrease volume on the LG system, then increase the volume on the TV all the way up. You now can use the LG system as the master volume for TV.

There are many options here. Most HDTVs today have analog audio and digital audio output jacks. You can use RCA audio cables or a 3.5mm connector, whichever your HDTV has to connect the analog stereo output of the TV to any number of devices such as a stereo/amp which has speakers attached. You could also connect an FM transmitter to the TV and send the audio wirelessly to a nearby FM radio, boombox, portable etc. Most HDTVs today have a digital audio output, typically optical, which uses a digital audio cable ($15) to connect to a surround sound receiver. You can also connect the stereo analog output jack on the TV to a 2.4GHz transmitter and receiver speaker combo to get wireless audio outside, in a swimming pool and so forth, all around the house using wireless speakers. These setups usually cost around $150 or so. Look for the jack on the TV labeled AUDIO OUT and see if it is the white and red 2 jack ports or the smaller 3.5mm single jack port. Adapter cables are available at Radio Shack for around $10 should you need them. So you see the options are almost endless.

if the Comcast cable box has an HDMI output, it should connect directly to one of the TV HDMI inputs. Then connect the LG DVD unit HDMI output to the second HDMI input of the TV. Use two HDMI cables. Do not buy the expensive Monster HDMI cables. If you have already done so, I recommend you take it back for a refund, then buy the low cost HDMI cables which will work just as good and then you can bank the savings toward a new Porsche Boxter!! Now we have the video connected from both the cable box and the LG system.

Now--what do you do if the cable box does not have an HDMI output--just use its component output and your component cable (red, blue and green) to connect to the TV component input. This will still get the video to the TV and good HD pictures. Hum--do you have an HD cable box? You did not say and I just assumed that you did since you got the HDTV. If not, let me know with a follow up question and I will assist in that area further.

Now for the audio connections--The DVD player will not need any connections since it in the LG unit. The sound will come out the speakers when you start playing the DVD. The cable box is where we get the TV audio to feed the LG unit. If the cable box has an optical output, use an optical cable (again the low cost one)and connect to the optical input on the LG.
This will get the TV audio to the surround system. If no optical output, use the red and white (left/right) audio connections and connect to one of the two the LG audio inputs. To hear TV audio on the LG speakers, just switch to that input or the input associated with the optical input.

To watch DVDs, switch the TV to the HDMI input to which you connected the LG unit. For TV, go to the other HDMI input (or component input).
Switch the LG to the audio input to which you connected the cable box to get TV sound.

Hope this gives you food for thought. If so, and you have more questions, just come back in with a follow up.

I have an almost exact set-up and you will only get sound out of your rear speakers when the TV channel is broadcasting in 5.1 Ch Stereo. Otherwise the sound is limited to your front, center, and woofer speakers.

optical cable connection in tv is only input and same in receiver it is both inputs.you need to find the right encoding in your receiver mode/set-up

Yes,
depending on how many speaker you intend to run will determine the type of amp you will need.  Set the output on the source unit to optical out.   Connect the optical cable to the amp.  Connect the speakers to amp.  turn them all on and select the iput of the source unit on the amp and enjoy.
good luck
chachig

I can't imagine your setup. Box, tv and pc speakers?
Typical setup would be box, tv and some kind audio system with optical IN. Correct wiring would be connect box to tv via scart and connect optical cable from BOX to audio system. You have to go from box not from TV since scart connection doesn't carry audio signal. To have TV to output optical audio out you would have to connect it to box via hdmi.