Just bought a new HDTV, a Phillips to be exact. While swaping between the guide screen and the actual channel your watching, the screen size keeps adjusting. Is this due to a specific setting on the tv, or is it the cable company? This is just really distracting while your watching, and is starting to **** me off.

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your select button on your remote, then you just go to exspand.

you likely have the "screen size" option set to allow the TV determine the best size (3:4 , 16:9, ...). Set it manually to 16:9 for HD channels or 3:4 for low-def channels.

The line should go away. This is a common problem on Samsung, Sony (Green line right side) and Phillips (yellow line left side).

In most cases the screen resolution and the actual video size have different dimensions, therefore video controls will change their size in fullscreen. To avoid this behavior a common practice is to use the screen resolution as fullScreenSourceRect, keep the scale of the controls and scale the video object to match the full screen dimensions. This can impact the performance of the video, especially on larger screens and with HD content.

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I believe your TV is in "ZOOM" mode for the screen. This will make a 4x3 picture come up closer to fill in the 16x9 screen, but this cuts off the top and the bottom.
Keep pressing the WIDE button on your remote until the picture looks best.
If you have HD channels, the screen mode should be on NORMAL. HD channels will have the 16x9 screen format.

The non-HD channels will have 4x3 screen format. When the screen mode is on NORMAL, you will have the cut off picture on the sides because the 4x3 format will not fill in a 16x9 screen.

i solved this by enlarging the picture size through setup, or the V-position.

are you watching with using time warner cable or an HDTV converter box? because if you are....on the bottom of your cable remote..on mine its the # button..above it says aspect...press that a couple of times and there are different zooms and stuff.

I notice this was made in 2008 and I hope you have found the answer. But if you or others have not here is my answer. Are using the RCA cable from the output on the DVD Player and you have plugged it into the RCA in ports then you need to use the remote to move through the on screen menu. My INSIGNIA has a Source List menu on the remote that shows on screen. I can scope through the MENU for TV, Composite Side, S-Video Rear, S-Video Side, Composite 1, Composite 2, VCR, HDMI 1, HDMI 2, HDMI 3. That is found using either the INPUT button on the upper left on the remote or the buttons; VIDEO, COMP, HDMI, AND TV across the top of the remote. Hope this helps.

That is what is called BURN IN or as the manufactures call it "IMAGE RETENTION". Basicly what this means it that you have been putting more hours on the part that is darker the smaller part, or the 4x3 picture or the square part. And, basicly the part that appears to be lighter is "LESS" worn out than the other part of the plasma tv. There is no fix for the problem, But if you go into the menu and select "BURN-IN" OR "Pattern sweep" or WHITE Screen than you will see exactly what i mean. Now, you can keep it on this pattern overnight if you would like, but i suspect it will not cure the problem, but lessen the effects of it. But keep in mind, you are reducing the life of the complete panel when you do this. Not that it is bad to do this. If you have anymore questions don't hesitate to ask anymore questions. The better fix is to Switch over to the "Dish Network and than you can format the screen on any channel in any mode. Superior product to cable. Have a great day. And watch out for the snow storm coming. GURU JAY

Try your setting on your cable box (Screen position)
also maybe wide mode try switching to wide zoom good luck