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Vertical or frame rolling indicates adjustment of the frame hold is required or perhaps there is a synchronisation fault.
Breaking of the picture in the horizontal plane is caused by the line hold requiring adjustment though the symptom can be connected with interior or exterior signal problems or perhaps a power supply fault, especially where both the line and frame are affected together.
It is probably a task for an engineer or at least someone with access to the servicing instructions.
This is caused by too high g2 voltage on the picture tube. Most likely the voltage divider (built in the flybakc trafo) has drifted . Or, someone turned up the voltage, using the adjustment potmeter located on the flyback trafo. In general there are two adjusters. The top one adjusts the focus, the bottom one adjusts the g2 voltage. Try to turn this on a bit lower, until the white lines disappear. This voltage determines (also) the cutoff point from the CRT. If it does not help, then there might be a problem with the horizontal or vertical blanking signal. This is not so easy to cure. You need the schematic, oscilloscope and technical understanding of how it should work.
If you are using a DTV coverter box, you may have changed the aspect ratio with your remote control. look for a button marked "aspect" or "picture size" use that to change size.
If you have a cable box, you may have a similar button.
Or you may find a picture size adjustment on your TV remote.
If you do not have "aspect" button on your remote try going to set up menu and look for picture size.
Older TVs used to have a vertical size adjustment at the back. look in the manual.
If none of the above, you have a biiger problem with the TV internal parts needing attention
There is a sevice menu but it is something a repair man has to adjust. Even to get to that menu is a matter of procedure. If the picture is not always squeezed down then adjustment is not the problem. If it is intermitant it could be a bad solder connection on the main board.Sometimes a bad vertical ic and leakey capacitors can be the problem..
Bottom line is there is not much you can do to correct the problem. You are going to need a service man
Sounds like you may have caps going bad . Adjusting may tend to only stretch the the picture too much . Also when you say horizontal are you saying the top and bottom are closing in ? If yes then your problem is in the vertical section . If side to side then check the horizontal section . Good luck