On my flat screen tv I only have full screen coverage on certain channels. Why not all of them.

hi try going into the samsung menu go picture setting select aspect ratio set to auto hope it helps

regards
shaun

Turn on the TV and grab the remote. In most cases, you will need the original remote to unlock the TV if you aren't sure of the unlock code. If you don't have the original remote, you will need to purchase one.
Look at the screen. If you see a blank screen with a red key on the bottom of the screen, press 'Function' and 'Mute' at the same time. This should unlock the channel. This is an option for people who want the TV to stay locked but, want to be able to bypass the lock to watch a certain show or channel. All other channels will remain locked and the TV will fully lock when it is turned off.
Unlock all of the channels on the TV by entering the factory reset code. There are three main reset codes that TV manufacturers set. These are 0711, 6688 and 3308. Try each one until you find the one that works. This will reset the TV to original factory settings. When you do this, you will loose any information that you have stored in the TV, such as favorite channels, automatic timers and the clock. You will have to go through the full initial set up.
Call the technical support service number in your owner's manual if none of those codes work. A technician can help you troubleshoot the television because the problem may not be the locking control. When you call, make sure that you have the model number and serial number of the TV.

Take your television to a TV repair shop. In some cases, a professional who access to wiring diagrams for your television set may have to rewire certain components in order for the television to unlock. This is usually the case when the TV locks by itself while it is on.

I AM NOT AN EXPERT ON TV'S BUT ARE YOU AWARE SOME STATIONS PLAY MOVIES WITH THE SCREEN SHORTENED? ITS DUMB IF YOU ASK ME.

Hi, hit the cc button on your remote control untill the close caption display says off, this should eliminate the box from your screen

you have to take in affect on how old is the tv if you have had it a few years then the screen is going out and will only be a matter of time before it goes all the way out and you will be buying a new one if it not old and its one of the newer flat panels then its the signal that the tv is receiving if its hooked to a digital antena then you only get max of 720 from it on certain channels no matter if the channel or channels are showing hd with out a hd source your tv will not show better then that i have a 42 inch hd flat panel and use a antena and the best i get from my hd broadcast channels certain times will i get true hd like when the news is showing or when one of the series that was filmed in hd is on other then that i only get a 720 picture instead of a 1080 most commercals are not film in 1080 but in 720 max and i dont know why makes no since

Do a full channel scan again. It should solve that problem.

i want full screen on my tv

Your format is wrong. Make sure that your tv is in full mode and your direct tv is in 1080i stretch mode. This should correct the problem. Also, WB is having problems. This is common on their channel. If it is happening on any other channel, try the above. Hope this helps. JOHN

I've seen this problem before. Try to adjust the horizontal settings in the tv. you should be able to adjust the picture up just a bit and it will get rid of the lines. also if you are hooked up thru component or hdmi you should be able to press the # button on your time warner remote to fill the screen. Hope this helps.