LCD projector convergence HELP?!?!

The alignment may well be in the way the panels are made, hence the different part numbers. If you'd like to verify, try installing a different green panel and a red panel instead and see which one makes the convergence change. If the panels are indeed identical then the convergence is adjusted in software, if there's no service menu then you'd need a custom alignment rig. Given the cost of a new blue panel is probably prohibitive you haven't got much to loose, you may be able to file the holes a bit larger and adjust the panel that way to make it acceptable.

Did, as the green in Q had three or four pixels out. I'm now left with a ferpect picture, however the convergence is now out two ways. The part # is therefore not part of the alignment.

I think I will do this. Setting up a test rig should not be too hard as the normal state of them appears off. With the spare parts/lense etc and a 250W mercury vapour lamp, should be able to do it to something usable for TV viewing.

I've put in a call to see what the panels cost, if they are cheap I'll make an effort to repair as many as I can.

Many thanks.

It's not? If changing to a different color panel changed the alignment then I suspect the panels *are* different.

Sorry, I might not have been very clear there. I swapped a green _as well_ as the blue to make a comparison. The green was swapped with the same part # (ALT2) from the other projector, blue got red from the other one (ALT2 going into the ALT1 slot).

There is more to it than just the part number. I suspect this has a lot to do with how the panel is cast into it's plastic housing.

The plastic housing is then screwed in a non adjustable way on a plate that is soldered to the prism assembly at four points. Comparing panels, the soldering positioning varies (ie: there are larger tags on the prism than that of the plate the panel screws to), some of these solder points are on centre and some slightly off centre.

I'm yet to work out the difference between the LCX031ALT1 and LCX031ALT2 though. Of the 4 projectors I have, one ALT1 (blue) was totally burnt out in that had incinerated the colour filter, another the ALT1 was totally dead, however had not damaged anything. The remaining two still work, however are developing a blue smear in the picture. IIRC they are all much the same age.

After finding the ALT2 panel works in blue possie, I'm left to the conclusion the ALT1 is the same, however perhaps a superceeded part # that had "issues". Interestingly, it is the one closer to the lamp, however would be surprised if it is different because it is warmer there and there are cooling issues, however that does not make sense to me.