I finally had some time for research. These may be of interest:

http://www.barco.com/projection_systems/downloads/moca.pdf

http://store.mcsinet.com/kore/catalog/Pr...SF/product.html

So it seems that at least some multi chip LCDs have external or motorized convergence adjustments. And, as I said before, I suspect even (at least some of) those who don't expose it still have a set of screws buried deep inside their guts for a service tech or assembly tech to fiddle with.

Have a good one.