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I'm sure Comcast will be more then happy to direct you on phone step by step on how to do this... I'm sure you pay them every month.. don't you. Best way I'd hook up is through the 5 RCA jacks monster cable. 3 for picture... green red and blue. then the 2 red and white for sound. match colors cable box TV. if asking to connect direct cable to box.. your tv will pick up either some or nothing. you still need the Comcast cable box.
I was just reviewing the specifications on this particular model and I see that it is a 720P unit. If you already have HDTV's and they are 1080P units then you are definetly going to notice a difference. Also keep in mind if this is your first venture into HDTV older programming that is not in HD will not look good on an HD set. Try and find a HD channel and see how it looks if you havent tried this already.
get the remote... go to menu...roll through to you come to picture / set up here you should see zoom1, zoom 2, normal, wide and panaramic... (note that some shows broadcast in wide screen) top & bottom is cut off...and in hi def the box (picture is showing like a box) all around is black out...don't feel bad I have 56 inch hi def and get mad.... i have 4inches all around all black out if i wanted a 48 .....
It depens on what the cable box outputs are, you need to see if it has RF Coaxial jack (use CH3 or CH 4 on the TV), composite video out (Yellow RCA jack) with red and white RCA for audio, component video outputs (Red, Green, and Blue RCA jacks), or HDMI output jacks. HDMI and component video are for HI-DEF if you subscribe to the HI-def package. The cable company should provide you with the owner manual. Please post back with more info.
Make sure that the cable box set set up menu has the sound selection as HDMI. This is needed especially if it is a Scientific Atlantic Cable Box.
If this does not correct the problem, call LG Customer Service to get a local Service Facility to take a look at it.
Hope this helps,
Some CATV hi-def receivers are known to have issues keeping up with the datastream. Symptoms from the picture going solid black to other unpredictable video have been seen. Ask your CATV provider if they can switch your brand to another manufacturer. If your cable box has component video jacks in addition to HDMI, try that too. Some boxes will output RGB perfectly but bomb out with HDMI.
I have a Sharp Aquos 46" and go a Comcast HD receiver as well, and had the same problem turning off the Closed Captioning. I order to turn it off you need to go into the box user setting by (starting w/ the cable box and tv on) pressing the power button for the cable box then the menu button for the cable box. This will open up the user settings menu. Just toggle CLOSED CAPTION to DISABLED.