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Some TV's have a zoom function others do not. The program you're watching controls whether the top and bottom of the screen have black bars and is not the fault of the TV. Widening the picture cuts off a lot of the viewable picture and distorts the image. Circles tend to be oval. If your TV has a zoom function, use it.
Check the main output voltage (B+) from its SMPS regulator side. If this voltage is lesser than normal, picture won't fill the entire screen. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. http://electronicshelponline.blogspot.com/ Pull up older posts.
Disconnect the monitor from the computer, unplug and then replug it in. See if the entire screen lights, if only for a second. That will tell you whether it is the monitor itself that is bad, or the signal it gets from the computer. If the former, there is not much you can do but check the settings manually on the side or back of the monitor. If it is the latter, check the cable (s) and the plug connection. Check all pins on the connector. Do not know from your question, whether this is a vga, dvi or hdmi connection to computer. Good luck
Right click on your desktop and click screen resolution. Increase your resolution. If you are not able to then you need to download your display driver. Search for device manager and go down to your display. If it has a broken or missing driver then go to hps website download and install the driver.
there should be a button on your remote that adjusts the picture to fit your screen. They have that on most tv's. Are you using a cable box? your cable box also has settings depending on what your using. 1080i, 720p? does it do the same thing with a dvd player or game console hooked up?
This is common issue of the channels that use 4:3 format while TV is designed for 16:9. To get it disappear, you just go to picture option, choose WIDE FIT, this fuction will widen the picture to whole screen. Of course, you have to accept the picture is blur a bit.
you might be getting more supply from regulated power supply if you get wide pictureor width have to be adjusted by width control.
but if it stretchs out & lose some of the picture on the right and left edges it might be due to horizontal output section.
1 loose contact in connector.
2 some capacitor might be defective in h/section
please do not open the set unless you know about high voltage in tv set.