Sony model number KDS-50A2000 green haze

If a colour wheel goes slightly out of sync would that lead to an overall and consistent colour cast?

I think that what you may be referring to is an indexing problem with the color wheel. I believe it that were to occur it would be more likely to cause a sort of "shadow" in the picture rather than an overall haze. This is a pretty well known problem with these sets. Sony has been sued and forced to make restitution however millions of people still got left holding the bag. Lenny

I think we need a think check here. I looked up that model on Google and found this :

"3 SXRD chips (R/G/B), Over 2 Million Pixels each. "

Now that seems to indicate that it is an LCD, but could actually be a three chip DLP, I didn't get that far. However in either case that means that there is no color wheel.

Obviously then there are dichroics to separate the colors. If it is a three chip DLP there is a good chance of maybe fixing the light engine because you might find one in scrap somewhere that was canned for another on many possible problems.

However from what I've seen polarizing filters go bad in LCD units, probably partly due to heat, but maybe just due to the sheer volume of light passing through. In either case I have been through the possibility of actually replacing a polarizing filter. The problem is the orientation.

Here is the main question, can it modulate the green ? Let me clarify, does it look like a set with an HK short in the green with a weak green gun ? i.e., if you turn the brightness all the way down it is green and if you turn it up it goes magenta ? If that is the case it is probably the green polarizing filter.

However if the white is actually white, it might be somethng else. The set is said to use SXRD chips. I am not sure if that is DLP or LCD really. There is no reason they can't use three DLP chips, although the only reason I can see is for better response time. And that set has it, 2.5mS. However it does seem that a three chip DLP would be even better.

If it is a polarizing filter, you can buy that material. However you must have at least a little piece of it from the original intact to determine the orientation as it is impossible to do it by trial and error. A thread a few years old outlines this, pertaining to a Zenith D something WLCD. Eithr D60WLCD or D52WLCD, something like that.

One day I will tear into one, but not until someone is wiling to pay for it. If I spend a day on somethng like this and can't pull in at least $300 the boss will have a heart attack. And it would take time for sure.

Alot of this is supposition, but one thing is for sure, the set is a three chip, therefore there is no color wheel. And anyone who wants to tear into me pointing out that it might be LCOS, I remind you that LCOS IS LCD.

I've done some further investigating of this problem and have found that it occurs due to a poor design of the optical block. The heat causes the filters to distort and dust that gets into the assembly because it's not sealed gets burned into the plastic as well. Your basic shit design. This is 300.00 to the trade for the rebuild, and since the original problem was never really resolved, after the repair one can expect to repeat it again after 2 or 3 years. And this information comes right from a light engine rebuilder. I can hear this dog barking from a long way off. Lenny

My comment is, that series had such a bad track record, you probably would be doing everyone a favor and point the customer to the nearest Best Buy.

I have one of those Mits dlp's on it's 3rd and final light engine. It's the same vintage (05/06) and it's just crap engineering.

I thought though on the SXRD's, the greenish tint was more in the form of blotches rather than a uniform tint.

I just can't see a reason to put any money into it, taking a quick look around Craigslist, if they were in love with that model for whatever reason, seems like a working, good condition exact model is only $400-$450.

-bruce snipped-for-privacy@ripco.com

he

on,

My 25 inch 1985 Sylvania still has a great picture and I don't have to replace lamps, or filters...Lenny