tom - I've been discussing this with Moonchilde (obviously thanks to your original suggestions on this topic), but wanted to follow up with my current attempts on my 50 inch ST60 (I'm seeing pink blobbing in a couple areas of the screen). I'm using the following multimeter:
I've got it set to DCV (the first position to the right of "off", which is what the main amazon picture shows), which seems like what I should be using, but the readings don't seem to fall into the range I was expecting, and they don't seem to stay consistent when I check every few minutes (which may be normal, I don't know). Moreover, when I tweak the pot (which appears as a white screw a couple of inches below the vsus cap), the reading doesn't change...
I'm doing readings on the wires coming out of the capacitor labeled vsus, and I'm getting readings around 1.2 (the screen says mV, which has me confused as that's not a lot of power, unless I'm reading it wrong, perhaps "mV" is indicating the greatest resolution of the reading; nevertheless if it's in volts, then 1.2 is nowhere near the 140-200v you've discussed we would expect).
As a side note, I already tried the service menu adjustment from low to high vsus, but that didn't do anything, so I left it on low. Also, to your previous post, I do not see any dead pixels on my screen, so I guess that would point towards a possible vsus issue only.
Pictures of the board and close up of the vsus area: