I have a question for all the Rear Projection folks out there. I have recently inherited a Sony KP-46WT500 with a manufactureing date of 2003. The TV is in excellent shape except for a yellowish burn-in square caused by watching all the programs in a 4:3 ratio and not turning on the gray bars on the sides. In full screen its not real noticable until you watch a black & white program or when the sky is in the back ground. I have found a source for the screen parts, I just don't know which one to replace. The screen is actually three layers. The outter screen, the middle (lenicular) and the inner (fresnel). I'm guessing that the middle screen is what I need to replace, but I'm just guessing.
Has anyone out there done this before and am I assumeing correctly?
Thanks, New Guy
The problem is not the screen !!! -- it is the crt's if the discoloration is yellow your blue tube is what is burnt, also check your green tube, look down into the tube with a white raster being displayed, you will beagle to see the tubes that are affected, blue being number one, and possible green being number 2.
You are absolutely right. I finally got around to removing the top cover to clean the mirror and the fresnel. As I was looking into the focus lens I noticed some dust particals under the lens and looking through the lens the particals looked large enough to cause some distortion. I removed the focal lens and used a lens brush to clean away the particals and low and behold on the blue CRT I saw the same yellowish square I was seeing on the screen.
Is replacing the CRT the only way to correct this?
Are the CRT's difficult to replace?
I was afraid to use any cleaner on the CRT. I have the sercive manual and the CRT from Parts Store is going to run about $277.46
Thanks for the help.
Cougar
That sounds correct, the only way to fix it is to replace the blue tube, and possiably the green. but the blue should get most of it. Tube replacement is not too trickey. but you have to be carefull.
CRT replacement in a projection set is not for a novice. Besides the difficulty of the job you'll have geometry issues to deal with along with having to do a complete convergence.
Honestly, for what it's going to cost you to have a qualified service shop do the job you could just as easily go out and buy a new HD, 42" Sony LCOS rear projector which will provide you with a better picture on top of being HD ready.