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This problems u are having it is not the causes by the tv,because ur tv it is a analoge CRT tv,don't have this functions zooming in or out or the problems just causes only 8% cutting off edges of the tv pictures only.If the problem it is happening to ur analoge tv it will have no vertical hold at all.The devices u are connected to the tv and using have zoomming in or out buttons or ajustment buttons of the sizes of the picture on the screen.Used the devices remotes controls to readjust ur zooming or pictures sizes adjutment.
If the image on screen is zoomed both in vertical and horizontal direction, your TVs power regulator inside it is faulty. [Overvoltage]. If it is zoomed in vertical direction only, that is only the height of the picture is zoomed, you can adjust it with the remote control button directly on going through menu and get in to the function menu. Normally all TV remote has a special button marked as "Zoom" which on pressing it once the picture get zoomed, again another press the picture gets wide and again an another press picture will come to normal mode. You should select normal mode to retify the problem.
If you go to 4:3 mode and the picture is still cutoff then i would assume the tv has a problem with the horizontal or the pinchusion correction circuit . This would be the only two areas that would cause this problem . Check the format section of your menu to make sure it is not in zoom mode or otherwise if it is not then you have a problem with one of two above mentioned circuit problems . Good luck