I've been playing with a broken LG 566 LM LCD screen I got my hands on. I
posted about it about a week ago, and I've since replaced all of the caps on
the main board with no change in the symptoms.
I started poking around on the board checking voltages as best I could by
following traces from the power input lines, and I noticed that there are a
few caps near the two ribbon connectors that run to the actual LCD panel
that have voltages written next to them in the silkscreen. The voltages
written are 9.2, 3.3, 18, and -6 volts. The caps themselves are rated well
above these values.

Measuring between the positive side of these caps and ground with the unit
powered on, I get nothing above 4.5 volts -- does that seem odd, or is there
something about the way I'm measuring that would give me false readings?
I do have good voltages at the input from the power supply, 2x5v and a
single 12v, but since the one visibly bad cap that I replaced in the power
supply was on the 12v line, I'm wondering if there is some component on the
12v line of the main board that shorted or went open and is causing
problems.

If anyone knew where I might be able to find a schematic for this unit that
might help me out, I'm by no means a professional tech but I like to learn
what I can by tinkering with broken gear... especially when there's nothing
to lose, as in this case! All I have is a DMM and some spare time once in a
while, but I'm hoping I might get lucky and find one bad part that is the
culprit.

Thanks in advance for any help!