I just bought this TV 3 days ago. My parents have the same TV and their HD channels and DVD images are crystal clear. I have messed with the picture settings a million times already, but I can't get rid of reddish splotches on darker background colors. People's faces also have weird pixel problems with shadows.
I don't think the problem is from my cable provider because I have the same problems with watching DVDs and playing Wii. I have an upconvert DVD player with HDMI cord and my Wii has component cables.
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Long story short, it is not your fault. Your provider will blame you, TNT, will blame your provider, and both are wrong.
The most likely cause is HD TNT is not a "real" HD channel. It is probably an SD recording TNT is upscaling from SD to HD. This can occasional create a dirty HD signal being broadcasted. Some TVs have trouble decoding this signal and end up with pixelated images because the image has been pre-stretched to fix the format.
Temporary solution would be to change the resolution of you TV for just the TNT channel. Some TV will let you select a preferred mode for a channel. If you can do this, set it to 720p instead of 1080p or try 1080i for TNT to see if this improves the image.
Also make sure that only one tuner is altering the images you are receiving if you have a FIOS box. If it is processing the image image in any way (color correct, resolution, etc.) turn those features off and let the TV do it.
A broadcaster will transmit an HD channel in 1 format. This may be 720p or 1080i, both of which are HDTV formats. HDTV formats have an aspect ratio of 16:9. SDTV or standard definition broadcast have an aspect ratio of 4:3. Because not all content is record in an HD format (ex: Judy Judy), the broadcast is faced with 2 options. #1, stretch the 4:3 picture do that it fills the 16:9 canvas. #2, simple place black side bars on each side of the 4:3 image. What you are seeing is the latter of the 2 options. You will notice a change during the evening programming. The bars are only there when the content is not HD. You can use the WIDE feature of your TV to stretch the picture so that it fills the screen, just like broadcaster option #1 above.
yes its a cable box problem, find the channel you are having more problems with,press guide in the cable box remote and you will see how the box where the video is will still have the problem and the guide with channels info its going to be clean,
100% weak signal
Do you have a HIGH DEFINITION satellite / cable SERVICE? Unless you are specifically set up to receive HD - your picture will still be back around 400 lines - and both LCD and Plasma HD units are notorious for looking WORSE when viewing NON-HD PROGRAMMING.
Unless your DVD is capable up converting up to (pseudo) HD, don't expect much there either.
Not sure how the INSIGNIA is set up for inputs, but good old Wal*Mart sells a FANTASTIC UNIVERSAL REMOTE called AVEX that is an absolute JOY to program and work with - and it's only about $20!
Put a DVD in your player and turn it on and let it play. I doubt that you are actually looking for a "CHANNEL" - but instead an *input* that is electronically controlled by your tv.
Go to the "TV" position on your remote and find the "INPUT" button. Pressing it should bring up a menu of different inputs that your tv has. Use your center UP/DOWN button to switch inputs until you see your DVD playing through one of them.
I am leaning towards scanning on this problem but you should have a schematic and the proper equipment to rtest this problem, I would suggest taking it to a TV repair shop of look for one on FixYa that can look at your system.
The best way is to contact your service provider and ask them to trouble shoot guide you, there should be a way to reset or diagnose the receiver or if you prefer go back to the place you bought it and ask for a replacement, You should still have the manufacturer's warranty, check that as well.