I don't think they do, but if I recall correctly, all the sheets I've ordered from 3DLens are polarized in the same direction. You can hold them next to each other before you install them to get a sense for how much light is passing through. Good luck!
//Ken ________________________________ From: M100 <[email protected]> on behalf of Tom Blum <[email protected]> Sent: Friday, August 16, 2024 1:26 PM To: [email protected] <[email protected]> Subject: Re: [M100] Restoring LCD screen Thanks for this guidance. The back glass is clean. Both the reflective and polarizing materials have been removed and I just need to remove a bit of leftover adhesive. The issue is with the front polarizer. I'll remove that and see if I can eliminate the streaks. As for the 90-degree offset between the two polarizing sheets, I can give it a go -- it's my first time getting this deep into LCD electronics. Do the polarizing sheets from 3DLens come with markings that help tell which axis the sheet is oriented: vertical versus horizontal ? Tom On Fri, Aug 16, 2024 at 10:58 AM Ken St. Cyr <[email protected]<mailto:[email protected]>> wrote: Hi Tom - It's a little difficult to tell from the photo, but double check that you removed both the reflective paper and the polarizer from the back. The entire piece of glass should be completely smooth - don't be afraid to use IPA and a razor blade to remove any leftover adhesive - just be careful not to cut the zebra strips. If you've completely removed the rear polarizer, and the streaks are still there, then they're under the front polarizer, so you're going to need to remove that and replace that as well. For the replacement rear polarizer, you'll want a sheet of reflective polarizing film with the adhesive already applied (sorry, I said transflective earlier, but I wasn't thinking - a transflective sheet is semi-transparent to allow a backlight through). For the front polarizer, you'll want just a standard polarizer sheet with the adhesive (no reflective material added). For the video, I used this for the rear polarizer: https://3dlens.com/reflective-polarizer-film-200x250mm-with-adhesive.php And for the front polarizer, you can use something like this: https://3dlens.com/linear-polarizer-film-200x250mm-with-adhesive.php So, you'll need to sandwich the glass between the two polarizers. When you do, you'll want to offset the polarizing film at 90-degrees from one another for maximum visibility. Just make sure the glass is completely clean - it should be smooth and streak-free on both sides. //Ken ________________________________ From: M100 <[email protected]<mailto:[email protected]>> on behalf of Tom Blum <[email protected]<mailto:[email protected]>> Sent: Friday, August 16, 2024 9:17 AM To: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> Subject: Re: [M100] Restoring LCD screen Jeff, Thanks for this. The streaks and ridges are on the front-facing glass. Is the next step to scrape/pull away the material on that glass? What will I replace it with when done? From Ken's video, I understand how the transreflactive/polarizer sheet is installed on the back glass. Just unclear about what happens on the front-facing glass. Tom On Fri, Aug 16, 2024, 8:30 AM <[email protected]<mailto:[email protected]>> wrote: The screen is NOT clean. You are seeing clean streaks on a very dirty glass. Jeff Birt From: M100 <[email protected]<mailto:[email protected]>> On Behalf Of Tom Blum Sent: Thursday, August 15, 2024 7:14 PM To: [email protected]<mailto:[email protected]> Subject: Re: [M100] Restoring LCD screen Here's the photo: On Thu, Aug 15, 2024, 8:12 PM Tom Blum <[email protected]<mailto:[email protected]>> wrote: Hi Ken, I've watched your very helpful video multiple times. The attached image shows the diagonal striations on the outward-facing glass of the lcd assembly. You can feel the malformation when running a finger across the glass but there is no physical issue on the back glass panel on which the replacement reflector/polarizer will be mounted. No heat was used to lift the transreflective polarizer. It actually peeled away beautifully (the old polarizer and reflector) with minimal glue left on the back glass. Tom On Thu, Aug 15, 2024, 4:09 PM Ken St. Cyr <[email protected]<mailto:[email protected]>> wrote: Can you share a photo of the diagonal waves? Did you heat the screen while removing the transflective polarizer? FWIW, I did a polarizer replacement on an M200 screen in this video and it worked out great - https://youtu.be/eBRtDURtw00 //Ken ________________________________ From: M100 <[email protected]<mailto:[email protected]>> on behalf of Tom Blum <[email protected]<mailto:[email protected]>> Sent: Thursday, August 15, 2024 3:48 PM To: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> Subject: [M100] Restoring LCD screen Looking for some guidance regarding repair of Model 200 LCD..... Purchased a junk M200 for parts. About 3/4 of the LCD's reflective layer is burnt. Was able to peel off the reflective layer and back polarizer. What I notice now is that the LCD glass has a few, random diagonal waves in it, as if the LCD glass was heated, became fluid and then resolidified. I was thinking of purchasing and installing a new combo polarizer/reflective sheet but am wondering if the imperfections in the glass makes restoration of the LCD a lost cause. Anyone handle this before? Tom
