Samsung s7 Edge - Non-working touch after separation of LCD from glass

Hello. My problem is as follows.
I bought a cryogenic separator, I have already separated a few glasses, everything is going smoothly but there is a problem with the touch. In a few cases, after separation, there was a touch at the bottom of the screen.

The first pieces were fine, but I cleaned them hot, rolling the glue with my finger with practically no chemicals. Subsequent pieces were cleaned with spirit, were overflowed quite heavily, and scratched with plastic tools. do you think this could be it?

The strangest thing is that the touches fall at the bottom of the screen.

I am asking for an opinion from people who deal with such repairs.

Today I noticed that on the display that I put on the previous day, there were some internal cracks, scratches in the depths of the screen. It was the same with the earlier display. At the time, I thought that I had simply not noticed them before, but now I know that the cracks do not show up until the second day after unsticking.

During my first play, I cracked the digitizer in the S Advance, the display showed without any problems and the touch did not work. I suspect you are damaging the digitizer, a delicate matter.

Gentlemen, what I will write may seem illogical, but we had such a case with s5 neo that the touch after cutting the glass was freaking out, it started working properly after replacing ... the polarizer. We had only one such case, but still.

Certainly damaged digitizers. It's just strange that the cracks don't show up until the second day.

As for the s5, it does not surprise me at all. The touch is adapted to work with glass and a polarizer. And although I did not have such a problem in the s5, there are a lot of displays which, despite the fact that they have a built-in touch in the display, react to touch only with the glass. Ignoring this argument, note that the glued glass pane presses against the contact point of the tape and the display.

luklas944 wrote:

they were shed quite heavily, and scratched with plastic tools. do you think this could be it?

It could be the cause

Hello, does anyone have a similar no-touch problem on the top or bottom of the s7 edge after peeling off the glue with a remover?

and how do you separate fast? Do you detach the display from the frame or do you freeze with the body?

I separated the last 4 pieces in the cryo, first the body, then the display. When the separated displays reached room temperature, I checked them and the touch worked on the entire surface. Only after washing off the glue with loca pro remover and long scraping of the oca residue did the touch disappear on the upper or lower part of the display. The question was, what was the reason for this? I will add that I secure the upper part of the tape so that the remover does not damage it. Could the touch be damaged in the cryo separator?

ok, when I still had a separator, I noticed that it is better to freeze the display together with the body, thanks to which I did not have to stick with sharp tools between the display and the glass, it was enough to bend the whole module with a quick movement, the glass often came off after a few such bends. By doing my touch like this, it didn't rain.

You will probably say that the touch falls after cleaning, not after separation. My theory is that in order to start separating on the display detached from the body, you have to stick something between the LCD and the glass. This can cause the display to leak, and solvent will get into it when cleaning.

It's just a theory, I can't explain it, but in my case it worked, the touches didn't fall.
If you check it, let me know if it helped.

I gave up. I had a frequent problem with a vertical green stripe after peeling off the tape.

The LCD LED strip repair guy told me that Samsung in the S7 edge specially made the display so that it was difficult to regenerate. He also told me that when the display gets too much moisture, the touches fall. Tomorrow I will carry out another test on the s7 edge in which the body will be separated on a traditional separator, the display will be separated into a cryo and the glue will be removed with a wire or with my finger on the heater without overflowing with the remover. Have you had experience with s7 edge digitizer replacement http://allegro.pl/dotyk-digitizer-samsung-galaxy-s7-edge-g935f-i7121107117.html. The video shows the entire procedure of the touch replacement: https://www.youtube.com/watch?v=dyFdLXGUpCw. I have 2 copies in which I need to perform a touch replacement. best regards

This guy didn't tell you anything new at all. This has been the case since Samsung S2.

As for the moisture itself, I did some tests. I put the separated S7 edge LCD into a zip-bag and poured it heavily with alcohol. After two days it was the same. If the display is separated non-invasively, you will not damage it with any solvent.

When I was learning to repair flat amoled displays, I also thought that they were damaged by chemicals. Now such displays are not terrible to me, and I use chemistry even more than when studying.

As for the touch swap, I haven't done it, but I know the guy who does it and he says he will come out once and then not. Not profitable in my opinion. You will buy such a digitizer, you do not even know if it is functional, and after welding the tapes, no one will refund your money.

Yes, the glue can be rolled, preferably on a vacuum separator. After a few cleanings, your fingers are kneaded so that you will stir the scrambled eggs with your finger and you will not burn yourself

luklas944 wrote:

After a few cleanings, your fingers are kneaded so that you will stir the scrambled eggs with your finger and you will not burn yourself

I confirm, in fact, I also gave up on edge after losing a few thousand. but I clean the usual samsungi and the skin on my fingers is like a horse's hoof.
In my opinion, edge is fun for people with strong nerves and deep wallets, the miracles that come out in these devices are nothing compared to the regeneration of flat ones, and if someone masters the technique, he does not want to share knowledge and I am not surprised at all because this knowledge cost a lot .