Our Zenith C27A24T has always had a problem where the top and bottom edges are too high and low, respectively, to be seen on the screen. It wouldn't be a problem, except that we frequently can't read scores or other text banners when they're being run high or low on the image.
We've looked through the menus for some sort of picture adjustment control, but can't find any. Is there anything we can do ourselves, or do we need to call in a repair person?
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Get the remote control and press the MENU key repeatedly until you see the Video menu at the bottom of the list of options you will see EZ Picture. Use the up/down arrow keys to select EZ Picture and use the left/right arrow keys to select your preference. Set the preference to Preset not custom. Press Enter, Quit or Menu to exit. See if resetting the TV's Picture settings resolves the problem.
If you have a bar at the top of the screen as well then it could be in letterbox viewing mode. Again just go into the Video menu and turn it off.
Dark picture? hmm. meaning there is no brightness variation, assuming this is the fault I think U might be having low screen voltage. Check for high value ( around 2W) resistor, preferably from 100K to 680K on the "C" board or neck board. Post back Rifaa
If there is no other problem, he probably touched the focus adjustment in the back of the set. Open up the back and locate the flyback transformer (part with large red wire coming out the top). There will be 2 adjustment controls on it. One should be labeled screen, the other focus. Adjust the focus until crisp.
If the line goes across the screen you have a loose solder joint on the vertical output IC.
I've seen this happen many times in Zeniths and a lot of other sets. If the IC is not loose then there is a loose solder joint somewhere else in the vertical circuit. These IC's are 10 - 13 pin chips that operate the vertical deflection on your set. I feel like a drop of solder in the right place will fix it!