So I tried various techniques to try reproducing the problem today,
all to no avail.

I don't mean to be overly critical, but I think I see a problem. You
remind me of something I had to deal with when training technicians
in a past life. I referred to it as "Circle the wagons. The Indians are
attacking". This was in reference to the tendency for some techs to
march around the problem area, gain a little more insight, but burn
huge amounts of time going literally in circles. The Indians never
had a chance, after tiring their horses, by going in circles around
the wagons. Both you and the attacking Indians would be far more
effective with a direct assault on the problem. At some point, you
will need to dive into the LCD monitor and get your hands dirty. No
amount of additional insight or diagnostics are going to prevent this
from happening. Even if you isolate the problem to a single capacitor
and totally undestand the failure mechanism, you'll still need to
crack the case and do the necessary parts replacement. Might
as well get it over with now (before your horse gets tired).
http://www.ccl-la.com/blog/index.php...ng-214t-repair


Excellent points, that need to be repeated often.

They're related to the issue of whether you're trying to figure out exactly
what's wrong, or simply getting the unit working again. Often (too often),
you have to abandon the analysis, and "dig in".

My guess is that this problem is related to the power-supply voltages for
the video driver circuits. Second guess would be a bad video driver. (I
don't know whether it's a board or a single chip in this unit.)