Originally Posted by jakemir
I was working with a KDF-50WE655 and a KDF-42WE655. The LCD panel numbers do not match at all, but they all look identical. I first used a green panel from the 42 TV and installed it in place of the Blue on the 50. After replaceing the blue dots were gone, but the convergence was off by about an inch. I removed everything, and tried again in the 42 using the 50 inch green in place of the 42 blue. On this set the tv has small (1/2) blue squares horizontally across the screen. There were about 25 rows. Here are the label part numbers for each TV:KDF-50WE655
Let me know if anyone can explain the BR vs BL, GR vs GL, and RL vs RR and also, if I did use the 50 inch TV, can the convergence be digitally adjusted.
On your tvs, in my opinion the LCX043ATs are interchangeable no matter what color path they are in, and the LCX043AUs are interchangeable. I have not been able to figure out what the B2/B4/B5 numbers mean. Ignore the 44.. numbers, they are probably some kind of date/batch codes.
Convergence is the big challenge when swapping panels. If you haven't already found out, simply removing a panel and putting it back in the same place is enough to mess up convergence.
I assume you have found a decent picture of some kind to do convergence, like a grid of white lines on a black background. Measure the delta physically on the screen, vertically and horizontally. Figure out the size of one pixel on the screen. (Knowing the dimension of the display area of the panel, the pixels by pixels, etc.) On the last 55" I worked on the pixels on the screen were .037" x .037", for instance. (Ignore overscan loss) Calculate how much the bare panel then has to be moved to eliminate the error, v and h.
Most panels mount with countersunk flathead screws. Get some screws the right length that are round head and some matching flat washers. Bore out the mounting holes in the LCD panel the appropriate dimension to allow you to move it the right amount. Hold the drill bit in a small vise-grip, not in an electric drill, and drill by hand. Cover the panel glass with a piece of cardboard and masking tape and watch the chips.
Boltdepot dot com is good, most of these screws are 2.0mm dia and 0.4mm pitch.
Make some visual aid like a scribed line on the panel mounting plane as a reference. Get out your car feeler gauge for a handy reference re what .XXX" looks like. On all three panels up is up; on the red and blue left and right are reversed because they go through one more reflection than the green. You also have to deal with 'rotational' convergence, because after you put the panel back on you have to get the line it generates on the convergence screen parallel to the others, as well as overlapping.
In the service menu you should find an electronic convergence buried somewhere. It will only be good for a few pixels though, nowhere near as many as you need to get 1/2". Use it for a final fine tuning. Probably in a different location in every model's SM unfortunately. Some models might not even have this.
Be very careful how you handle the glass prism block. When you undo screws, hold the piece of metal under the panel, not the body of the prism. Ditto when refastening. Get good at taking your tv apart and putting it back together, learn shortcuts and what you can do without, because there's a lot of trial and error here.