btokars -- Convergence adjustments are not possible, except by a factory repair facility - it requires complete disassembly of the PJ and remounting and allignment testing of the panels (they are not adjustable and it cannot be done in the "home"). Generally they are "in spec" (+/- 1/2 pixel) or better on most of them (occasionally, some units are delivered at or out of spec or have defective panels). They do not shift, unless the PJ has been dropped (or damaged in shipping).
For old PJs, some AVS members have attempted reallignment, but you do need the complete service and assembly manual. It is a big risk, and should not be done (at home) except as a last resort. For a new PJ, it's a lot cheaper to send it back to the factory for repair/replacement.
CRT PJs are a lot easier to adjust, but even those are not easy if a single tube is replaced. Re-tubing is usually done as a 3-tube assembly - already factory aligned tubes, which only require magnetic (minor) adjustment. That's a different set of parameters altogether.
Another way of saying it is that the CRT R, G, & B pictures are developed by beam positioning - LCD (or any 3 panel digital technology) develop the picture from the fixed allignment of physical picture elements (pixels) which do not depend on electrically controlled positioning.
For old PJs, some AVS members have attempted reallignment, but you do need the complete service and assembly manual. It is a big risk, and should not be done (at home) except as a last resort. For a new PJ, it's a lot cheaper to send it back to the factory for repair/replacement.
CRT PJs are a lot easier to adjust, but even those are not easy if a single tube is replaced. Re-tubing is usually done as a 3-tube assembly - already factory aligned tubes, which only require magnetic (minor) adjustment. That's a different set of parameters altogether.
Another way of saying it is that the CRT R, G, & B pictures are developed by beam positioning - LCD (or any 3 panel digital technology) develop the picture from the fixed allignment of physical picture elements (pixels) which do not depend on electrically controlled positioning.
















not my best week on this board.... 
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