I have a 2-year old 17" NEC LCD Monitor (LCD1735NXM), which has
developed a faint buzzing sound, along with the screen going completely
pink intermittently. When I tap on the case, the sound changes slightly,
and the screen goes back to normal for a time.

I have an electrical background, but before opening the monitor, I thought
of getting some ideas whether this sounds like a bad soldering connection,
which may be fixable, or whether this could be the sign of something else,
and not worth fixing. Thanks for any feedback / experience someone may
have with these monitors. Ken