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I have an ancient LG monitor, don't know the part number. Every so often the picture on the monitor shrinks. By shrink I mean like I have reduced the V-Size of the monitor to a value below 20. I know this is a hardware problem as this can be fixed by shaking the whole monitor a little.

While I would soon get a new monitor anyway, I would like to know why this happens.

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CRT or LCD? they are significantly different. –  Journeyman Geek Feb 18 '11 at 4:47
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Probably a failed connection. Before plugging in your soldering iron, write your will an put on clean underwear - when turned off, old CRT monitors store very high voltage lethal charges waiting for unsuspecting tinkerers.

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If shaking the monitor fixes it, then it's probably a loose part or wire inside.

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