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]> 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]> on behalf of Tom Blum < > [email protected]> > *Sent:* Friday, August 16, 2024 9:17 AM > *To:* [email protected] <[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]> wrote: > > The screen is NOT clean. You are seeing clean streaks on a very dirty > glass. > > > > Jeff Birt > > > > *From:* M100 <[email protected]> *On Behalf Of *Tom Blum > *Sent:* Thursday, August 15, 2024 7:14 PM > *To:* [email protected] > *Subject:* Re: [M100] Restoring LCD screen > > > > Here's the photo: > > > > > On Thu, Aug 15, 2024, 8:12 PM Tom Blum <[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]> 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]> on behalf of Tom Blum < > [email protected]> > *Sent:* Thursday, August 15, 2024 3:48 PM > *To:* [email protected] <[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 > > > > > >
