SOURCE: My Hitachi 60fx20b rear projection
Your tv is a CRT projection one - one in which the image is generated by 3 small tv tubes. In them the image appears when a beam is moved across the screen by deflection coils - one horizontal and one vertical for each tube. These coils are powered by the deflection units.
If the image shrinks vertically uniformly then that signals that the defect is in the vertical deflection unit: you either have a bad soldering that when heated by the current that passes thru it breaks the contact and the size of the deflection goes smaller, or the vertical amplifier circuit (the one that creates the deflection signal) is failing and it will have to be replaced.
To fix that you will need at least a basic experience in electronics, a magnifying glass , a soldering iron and some time - open the tv, locate the vertical deflection circuit by following the wires attached to the coils then look with the glass for the broken solder: find it and redo it.
if that doesn't fix it the circuit will have to be replaced - good soldering skills are required for that: the 18 pins are very close together.
If you don't think you can do the job properly then call a repairman, it will cost you around $200.
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