Broken protective glass is not just an aesthetic defect, but also a potential threat to the performance of your device. Sharp fragments can damage the skin of your fingers, and over time, cracks can grow, completely blocking your view or disrupting the operation of the touchscreen. Many users are wondering whether it is possible to do glass replacement themselves, without resorting to the services of expensive service centers. The answer is clear: yes, it is real, but it requires care and the presence of a specific tool.
The screen restoration process involves separating the damaged outer layer from display module (matrix). This is radically different from simply replacing the entire screen assembly, as it allows you to save a significant amount by buying only glass, and not an expensive matrix. However, the procedure requires patience, since the glue that holds the glass is very strong, and the matrix itself is fragile. In this article we will analyze all stages of work, from preparing the workplace to the final assembly of the case.
Before starting work, you need to mentally prepare for the fact that the risk of damaging the matrix always exists, especially if you have no experience in microelectronics. If the crack extends from the very edge and touches the cables, or if spots and streaks have already appeared on the screen, the matrix may already be damaged. In this case, replacing one glass will not help, and you will have to change the entire module. But if the display shows the picture perfectly, and the sensor responds to clicks in all zones, then self-repair is an excellent solution for saving your budget.
Preparation of the workplace and selection of tools
The success of the operation depends 80% on the correct organization of the space. You will need a flat surface, good lighting and no drafts to prevent dust from getting between the layers of the screen. The main tool for separating glass and matrix is separator a device that heats the screen to a certain temperature and creates a vacuum. However, for a one-time repair, buying a professional separator is impractical, so we will consider a method using improvised means.
You will need a hair dryer (preferably a construction hair dryer, but a powerful household one can also be used), a thin string (you can use a guitar string or fishing line), plastic picks or special paddles. Also critical is high-quality glue LOCA (Liquid Optical Clear Adhesive) or ready-made double-sided adhesive tapes cut to fit the model of your smartphone. Don't forget about isopropyl alcohol for cleaning and an ultraviolet lamp if you use liquid glue.
- 🛠️ Tools: a set of screwdrivers (Torx, Phillips), tweezers, suction cup, scalpel or thin knife.
- 🧴 Consumables: isopropyl alcohol, lint-free wipes, masking tape, adhesive remover.
- 🛡️ Protection: antistatic gloves, safety glasses (glass shards may fly into your eyes).
⚠️ Attention: Never use a metal knife or blade to pry glass directly above matrix. Metal easily cuts through the polarizer or the matrix itself, which will lead to the appearance of black spots and irreversible damage to the screen.
Before starting disassembly, be sure to back up all data and turn off your smartphone completely. Working with the device turned on can lead to a short circuit if the cables are accidentally damaged.
Dismantling the smartphone and removing broken glass
The first stage is to carefully disassemble the case. Most modern smartphones have access to the internals through the back cover. Heat the perimeter of the back panel with a hairdryer to soften the adhesive and carefully pry the cover open with a plastic card or pick. After removing the cover, immediately disconnect the battery by finding the battery connector on the board and disconnecting it with a plastic spatula.
Next, you need to remove all the elements that interfere with access to the screen: the motherboard, speakers, vibration motor and additional boards. In some models, the screen is attached to the frame with screws around the perimeter, in others - only with glue. Your task is to remove the frame and screen assembly. If the screen is glued to the frame, it also needs to be heated with a hairdryer and carefully separated, trying not to damage the cables going to the board.
The most crucial moment is separating the broken glass from the matrix. Secure the module on a flat surface (you can use double-sided tape around the edges without gluing the work area). Heat the surface of the screen with a hairdryer to a temperature of 60-80 degrees for 2-3 minutes. The glue will become softer. Pass a string or thin fishing line into the corner of the crack and, holding the ends taut, move the string along the entire screen with smooth sawing movements, separating the glass from the matrix.
☑️ Preparing to split the screen
During the separation process, constantly pour a little isopropyl alcohol into the cut to wet the glue and make it easier for the string to slide. If you feel a lot of resistance, stop and warm up the area again. Haste is unacceptable here: one wrong movement of the string can split the matrix under pressure. After the glass is removed, a layer of old glue will remain on the matrix, which will need to be removed.
Cleaning the matrix from old glue and dirt
Cleaning the matrix is the most painstaking stage on which the quality of the final picture depends. Remains of glue LOCA or double-sided tape are removed in different ways. If tape was used, its remains are rolled off with a finger or a special rubber roller. If liquid glue was used, chemical cleaning will be required.
To remove liquid glue, use a special solvent or high-concentration isopropyl alcohol. Apply the liquid to a lint-free cloth and gently wipe the surface of the matrix. Movements should be light, without strong pressure. Often the glue collects in lumps that need to be removed with tweezers. It is important to prevent liquid from getting inside the matrix or on the cables.
| Type of contamination | Cleaning agent | Tool | Features |
|---|---|---|---|
| Remains of double-sided tape | Mechanical cleaning | Rubber roller, finger | Rolls into pellets, easily removed |
| Hardened LOCA glue | Special. solvent / Alcohol | Lint-free cloth | Takes time to dissolve, do not rub too hard |
| Dust and microparticles | Compressed air | Can of with air | Blow off before final assembly |
| Grease stains | Glass cleaner | Microfiber | Use only on new glass |
After mechanical and chemical cleaning, be sure to blow out the matrix with compressed air. Even one speck of dust under new glass will look like a black dot or bubble that cannot be removed without repeated disassembly. Inspect the matrix under bright light from different angles to make sure the surface is perfectly clean.
What to do if the glue does not come off?
If the LOCA glue has polymerized and does not dissolve with alcohol, you can try to carefully shave it with a blade at a minimal angle, but this is extremely risky. It is better to use specialized liquids such as "LOCA Glue Remover", which are guaranteed to dissolve the polymer without harming the polarizer.
Applying new glue and installing glass
When the matrix is perfectly clean and the new glass is prepared (the protective film on the inside has been removed), you can begin gluing. There are two main methods of fixation: using a ready-made adhesive frame (double-sided tape cut along the contour) or applying liquid glue LOCA. The frame is easier to use and forgives mistakes for beginners, while liquid glue provides better optical transparency and adhesion.
When using the frame: stick it exactly along the perimeter of the matrix, remove the top protective layer and carefully attach the new glass, aligning the holes for the speaker and camera. When using liquid glue: apply a few drops or a strip of glue to the center of the matrix or along the perimeter (depending on the instructions for the specific glue), attach the glass and evenly distribute the glue by pressing, squeezing out excess and air bubbles.
If you use LOCA glue, after gluing the glass, you must place the smartphone under an ultraviolet lamp for polymerization. Drying time usually ranges from 3 to 10 minutes depending on the lamp power and type of adhesive. It is important to ensure that the glue does not leak onto the sides of the phone or into the connectors, since once it has hardened it will be extremely difficult to remove.
⚠️ Attention: When applying liquid glue, do not overdo the amount. Excess glue may leak under the volume buttons or into the charging port, causing them to jam. Always have a napkin on hand to quickly remove leaked glue before it dries.
Final assembly and performance check
After the glue has dried (or the frame has set), you can begin reassembling the device. Install the frame with the screen on the case, connect the display and touchscreen cables to the motherboard. At this stage do not glue it the screen is final and do not close the back cover. First you need to check the functionality of the smartphone.
Connect the battery and turn on the device. Carefully inspect the screen for air bubbles, dust particles, or uneven backlighting. Check the operation of the touch layer: open any application and swipe your finger across all areas of the screen, including the corners. Make sure there are no “dead zones” or false positives (so-called “ghost clicks”).
If all tests are successful, turn off the phone, disconnect the battery and finally fix the screen in the case by applying glue around the perimeter of the frame or installing the back cover with new tape. Reassemble all screws in reverse order. Turn on the smartphone again for final control.
The main difficulty in replacing glass is not the gluing itself, but the perfect cleaning of the matrix from old glue and dust removal. It is cleanliness that determines the visual quality of the result.
Possible problems and ways to solve them
Even if you strictly follow the instructions, unexpected difficulties may arise. One of the common problems is the appearance of rainbow stains or uneven color rendition after gluing. This usually indicates that the adhesive layer is applied unevenly or that there is air between the glass and the matrix. In some cases, additional heating and pressing the screen helps, but often re-gluing is required.
Another common problem is the glass peeling off at the edges after some time. This occurs due to poor degreasing of surfaces before gluing or the use of low-quality glue. It is also possible that the touchscreen will malfunction if the cable or touch layer controller was damaged during disassembly. In such cases, it may be necessary to replace the touchscreen separately or the entire module.
- 🌈 Rainbow spots: a sign of an uneven layer of adhesive or moisture ingress. Requires disassembly and re-gluing.
- 📱 The sensor does not work: check the tightness of the cable connection. If this does not help, the cable may be damaged during disassembly.
- 💨 Air bubbles: small bubbles can disappear on their own in a couple of days, large ones need to be squeezed out to the edge.
It is also worth considering that after replacing the glass The water resistance of the case (if declared by the manufacturer) will be lost. A makeshift assembly cannot provide the factory IP67/IP68 sealing level. Therefore, after repair, you should avoid immersing your phone in water or operating in high humidity conditions.
⚠️ Attention: Water resistance characteristics and warranty conditions may vary depending on the model and year of manufacture of the device. After opening the case yourself, the official warranty for the smartphone is canceled by the manufacturer. Check the terms of warranty service with an official source before starting work.
Frequently asked questions (FAQ)
Can the glass be replaced if the matrix is also broken?
No, replacing the glass does not make sense if the matrix is broken or spots, stripes or black dots appear on it. In this case, the glass performs only a protective function, and the image is formed by the matrix. If the matrix is damaged, you need to purchase and install a new display module assembly.
How long does the entire replacement procedure take?
For an experienced technician, the process takes about 40-60 minutes. For a beginner doing this for the first time, it is worth setting aside 2-3 hours, including time for careful disassembly, thorough cleaning of the glue and drying. Take your time, as haste often leads to damage to expensive components.
Is it necessary to remove the polarizing film from the matrix?
Absolutely not. Polarizing film is the thinnest layer on the matrix itself, without which the screen will glow with white light without an image. When cleaning the glue, be extremely careful not to tear off this layer along with the remaining glue, otherwise the matrix will become unusable.
How can you replace an ultraviolet lamp for drying glue?
An ultraviolet lamp is a prerequisite for polymerization of LOCA type glue. Sunlight theoretically contains UV rays, but the drying process will take hours, during which time dust will have time to get under the glass. Using household lamps without a UV spectrum will not give any effect. It is recommended to purchase an inexpensive UV lamp for manicure or a special lamp for phone repair.
Why does the sensor work worse after replacement?
Deterioration in sensor performance can be caused by several reasons: a layer of glue that is too thick, which has changed the sensitivity; damage to the touchscreen cable during disassembly; poor quality glass itself (cheap copies often have worse characteristics). Also, the problem may be poor grounding or lack of contact of the metal frame with the ground of the board.