Question about Panasonic PT-AE900U Multimedia Projector
There is a blurry spot about three ft. in diam. in the middle of my picture on a 120 in. screen. Also discolored in the same area. What can i do to fix this problem? The projector is only about 6 months old with only about 300 hrs.
I have this projector (out of warranty) and it had the same problem. I traced the problem to the green polarizer which is a glass sandwich assembly right in front of and attached to the green LCD panel frame, though I suppose it could happen to the red or blue. There is a plastic membrane laminated to the glass on both sides of one panel or slide which is the actual polarising element. The element that faces the opposite panel in the sandwich was melted in a 1/4 inch circle in the center of the polarizer. It looked like wavy ripples on a puddle when viewed under a stereo microscope or 10X loupe. With the LCD block removed you can hold the assembly up at an angle to a light and inspect each polarizer for damage. I can only speculate about the cause of this condition. My best guess is a very light paused signal left for an extended period that heat stresses the plastic layer like the sun through a magnifying glass. Anyway, I carefully removed the polarizer per instructions in the service manual, pages 63 & 66(available online), and replaced it with a new one (part #TKGP0029) at a cost of $75 and my time which was about 3 hrs. This procedure isn't for the faint at heart or the clumsy! You need a steady, meticulous hand, patience, and very good mechanical and preferably also electronic abilities to attempt this. The defective polarizer must be carefully and slowly pried away from the small strips of double sided tape that secure it to the LCD frame with an exacto blade or fine jewelers screwdriver, and the new one replaced with fine tweezers and gently and firmly pressed onto the tape. A stereo microscope or 10 power loupe really helps with the process. Make note of the orientation of the two colored dots on the polarizer, green in this case, before removing. Otherwise, send it to an authorized repair facility or remove the bulb and find a used "good" projector on eBay or craigslist that needs a bulb. The cost might be the same, occasionally $300 if you're lucky.
This symptom may also be caused by other related problems, but that's my story and I'm stickin' to it! Hope this experience helps in some way.
Posted on Apr 06, 2008
Clean lens-adjust colour and tint from main menu.
Posted on Mar 16, 2008
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