How to get the display glas off of the LCD?

You can do it with the right equipment if you want to, but it will take more time for an individual display? Nobody is going to try this as a DIYer unless you have some guts and can risk it. The only people crazy enough to do "glass-only" is a repair shop due to scale justifying the high risk. For an individual, the risk makes no sense.

This is truly such a job that the average person WILL MESS UP and ruin the attempt. I could probably do it without damage (or at least, to be able to recover a good display from bad glass), but my skillset isn't average. It's non-zero, but if I can get a high-end 4K LG IPS LCD by taking a chance on a free display with broken glass I'll take the chance I will botch it.

Anyway, if you want to do it you need a glass separator machine (this will cost you a few thousand bucks), bright UV lights, and UV LOCA glue to re-bond it to the new glass. If you get this wrong, the LOCA glue will penetrate and ruin the display. So yes, it is possible. It just doesn't make sense for most people to gamble on a losing battle.

One advice: don't do it.

The glass is bonded to the LCD. you have to cut it off using some wire. Putting it back on is not possible without expensive equipment.

The glass is just a square order of double Dimond clear float glass, A glass shop cut height and width for me. (cost $30)

laid it on the iMac and traced the corners with a very fine felt pen.

Then bought a glass cutter and cut the corners just a bit larger than they should be.

Used a belt sander with an extremely fine grit belt, and had had someone spay water at the contact points between the glass and the belt sander as I slowly wore it down to the felt pen marks.

cleaned the glass well with non ammonia glass cleaner.

Placed it back on the iMac and marked the black put areas. Used a quality frogger masking tape to cover the centre screen viewing area that was not to be painted, used a small round sticker to cover the spot for the top camera lens. Lightly just touched the areas to be painted with 240 grit sandpaper. cleaned glass again with soft no lint rag and no glass cleaner. Used ceramic black spray paint from 2 feet away, making 3 light coats, placed in a pre heated oven at 250 f, then turned it off so it would heat fast but cool slow. This bakes on the ceramic paint

Cut the glass off the screen with floss is the best way, twist a few stands together, but it will take a lot, do not use heat at all.

Do not use UV fluid, it is a horrific toxic substance that your bring into your home.

I am using just clear non acid based high quality silicone (fish tank silicone) to glue the glass back to the screen. Just a thin even coat that I dropped 1 corner on first and slow laid the rest down. moved the glass in different directions to work out the extra chalking. Final positioning, wiped off the extra oozed out chalking with vinegar then let it dry over night. Then reinstalled the screen, Note that it takes 2 weeks for the silicone smell to go away and would not leave it in my house for the first few days anyways, a garage is best, cold will not affect the bond or the cure. I want to try wild colours instead of black, but it has to be ceramic paint, for all other types will loose bond with the glass after a short while, really is a low cost fix.

Where can I buy a machine to handle A1418 and A1419 screen separation ??

I just completed the process of separating a nearly demolished glass panel from the LCD. It was a tedious task involving a lot of cussing and convoluted facial expressions over the course of about two hours. I started with a separator tool (you know the one with the flimsy tip on one end and a cute but worthless thin circle of plastic on the other. That was a waste of about 20 minutes. I changed to a metal ruler (with a cork backing facing the LCD) and a hairdryer. I figured that I was already looking at having to pay for the entire LCD glass assembly if I failed and only the glass with some double sided tape if I pulled it off (literally).

I spent nearly an hour and a half heating the screen just enough to loosen up the glue and wedge the ruler a little deeper into the void. Once I pulled off the last of the glass, I scraped the LCD face with an old credit card until I got the big lumps off. I pulled out the goo gone and lightly spritzed it on the screen (careful not to get too close to the sides). I tried to wipe the goo gone off with an old wash cloth but it was only getting stuck and sucking the goo gone off the screen before working it into the glue. I went up to my bathroom and stole some of my wife’s make up cotton circle things. They are just the right combination of sturdy and gentle. I used them to work in the goo gone and a new dry one to sop up the mess. I used a total of maybe six or seven of them and the screen is completely glue free.

Would I do this again? Heck no. There were some light scratches on the LCD when I was done and the cleanup was awful. It has been a little more than an hour and I still have sticky forearms despite vigorously washing several times with soap, glass cleaner, goo gone, and a host of other cleaning and grease busting products.

You can do this but is it really worth saving $150-250?

Why bother putting back a glass ? The LCD works fine and even better without it. https://www.pizzaundervolt.com/2020/12/2...