The rectangular components that seem to fail are wound with copper wire, or are in the case of the 17" equivalent to your unit. I am klutz enough not to know what the components are called. On some units, there appears to be a sticker on top reading "High Voltage."

Some good pics of the 17" screen, which seems particularly susceptible to this problem, here, down the page a smidgeon.

Note the presence of electrolytic capacitors on the board. I have occasionally wondered ....