Poor picture quality on a HDTV.

TV itself.

Contact RCA, apparently this model has problems.

https://www.youtube.com/watch?v=7w-Vc5CNYH8

I would suggest to leave your directtv hd/dvr box connected the way It is.
The HD Colorstream 1input on your TV should work just fine.
This TV does not have an HDMI input but you can buy an adapter and connect to DVI/HDCP IN and that might be able to get 1080i video resolution on your TV.

The curving is caused by bad digital convergencr chips (2) located on large signal board. They need replaced along with blown pico fuses and the convergence resistors. Chips are huge compared to a regular IC. 2" x 1.5" and they will be bolted on fairly large heatsinks. Cloudy picture is most likely the coolant needs replaced in the picture tubes. This needs to be done approximately every 5 years.

to C_LATKA:
Hi, I recently bought a 47" LCD LG the latest model and I read that you had purchased it previously and I wanted to know how you found the quality of picture on the LCD? At the moment ours is a bit blurry. I hope it was worth buying. Do you think we just need to tune the picture quality?

if all channels poor quality TV problem
if just one or tow channels bad quality not tv problem....

it indicates that the problem is aspect ratio or pixel settings for thescreen
bring up the on screen menu and adjust the pixel setting to fit the screen or the apsect ratio to fit the screen
read the operators manual to see how the adjustments are made

Are you just using the yellow cable at this point, because the quality would in fact be awful? Using the green, red & blue cables (component cables) would not improve quality much, seeing as the yellow video cable has a resolution of 480i and component cables are set at 480p. Your TV (if it is in fact high definition) would either run at 720p or 1080p depending on what the manual says and what the native resolution is. I would say try and buy and upconvert DVD player and make sure to get an HDMI cable to go from the DVD player to the HDTV (some DVD players come with this cable, but you'll have to look around for them, otherwise look on buy.com or something for some cheap ones). HDMI connection and the upconvert DVD player will improve picture quality significantly.

I also have a Samsung 46 inch HDTV and have the same problem. I reported it to Samsung. They sent out a repair man who replaced the entire audio system... I did not help at all. Sound quality still very bad. Hard to understand audio voice on most movies. Is there a solution short of installing an additional home theatre system?

What kind of cables are you using? I had poor picture quality until I upgraded to HDMI, the picture's great now.