No sound with comcast box and suround sound - LG 47LC7DF 47 in. LCD HDTV

it depends on the model #, and where your tv gets its feed source.( dish network, comcast, ant, vcr, dvd player, etc)I have a sony surround with no manual and set it up my self. look on the back where the components hookup to if there is a yellow, white, and red on the input, that is where your feed should hookup to, and there should be a monitor out to your tv,( a yellow video plug ). if your surround does not have a yellow on the input it will bypass the surround and go to tv video in

Maybe the cable signal is defective not your tv.the other channel is ok.if you tv has a defect all channel has affected.

Get the TV-related audio from the same place the TV gets it - the cable box. TV's aren't known for their great audio capabilites and usually only pass stereo audio.

look at the back of your tv does it have a audio out RCA jack?
it should do plug in the surround sound into that using RCA cables

if your tv does not have audio out RCA jack then you can

get a adapter which makes scart connectors turn into RCA jacks get that off ebay

plug the yellow line to the tv and connect the red and white to suround sound
but with this there are a few problems sound will only come out when surround sound is turned on and skys sound will never play out the tv
if you switch to a PS3 or something it will not play suround sound

yuo best option is the RCA plugs in the back of the tv

because you have not written the model number of the tv or the suround sound i cant help any further

do you wan the suround sound to play sound for what the tv is displaying or just the ps3

for just ps3

connect hdmi to ps3 and tv
connect optical to ps3 and suround sound
change video settings to hdmi
change sound settings to optical
it asks to set settings automatically you have tyo doo it manually

if you want to play every thing that tv displays then
connect ps3 to tv with hdmi
connect suround sound with hdmi to tv
(this might not work)
if it dont work then

connect ps3 to tv with hdmi
and your tv should have sound out or something along those lines it should be two phono plugs in the back of the tv connect that to the suround sound

got it to work off the cable box.

You will need a DVD player with an optical output, as the sky engineer said. A Co-axial S/PDIF output could also work if your surround sound has that input, however not all units transmit surround encoded sound through the Co-Axial output. Only option really is to upgrade if that doesn't work

I had the exact same problem on a brand new Insignia 26 " LCD with DVD. Comcast tech was able to fix it by changing the Comcast box diagnostics. Here is what he did. Using the Comcast remote with the TV on - press power, cable, menu in that order. A comcast diagnostic srceen will appear. Select Additional HDMI options, then audio options. Change the audio options to L-PCM. Press power again to exit the diagnostics. That will fix it and you get to use the HDMI cable.

the reciever you have is a dolby prolodgic system. the rear channel is monoral, that is that both rear speackers have the same infomation to it (and not much of it). the new suround sound systems are dolby digital/DTS suround sound. there is a major differance to the sound and the information presented. all channels are discreat and information provided by you digital outputs of your equipment provide the channel info (tv via optical digital out, DVD also optial or coaxal digital out, cable box also optical.)

I have a Motorola DVR from Comcast. Code 051 will make all the cable functions work. Haven't figured out how to do anything with the DVR bits,