The picture shrinks intermittently, mostly when the tv gets moved or bumped. It goes to the bottom of the screen and shows several different colored horizontal lines which then kind of flicker. After about a minute or two the picture eventually restores to normal. If the side of the TV gets bumped again it restores the normal picture. It seems to be worse of a problem when the back is on the TV and once the TV is on for awhile it turns on and off fine without the problem. All other functions work perfectly.
You have a bad solder connection in the vertical circuit. This will require you to resolder these bad connections before it blows out the vertical output IC or other parts in the circuit. Do this ASAP before you make a small repair into a large one. If you have no solid state printed circuit board experience, please play it safe and take the set into a pro to do this for you. Good Luck
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