How to Replace LCD Screen Glass with LOCA Glue?

 LOCA or Liquid Optical Clear Adhesive is a special UV glue or sealant used for bonding monitor/LCD screens and touch screen panels. It is also called UV glue. Most technicians prefer to use LOCA glue or UV glue over other glues or sealants because it can increase the contrast many times over. It also prevents light loss from the display, thereby extending the life of your phone's battery. Today phonefix will share why LOCA glue is used instead of LCD screen in mobile phone repair and how to use it.

Table of contents

1. What are the advantages of LOCA glue over other adhesives?

2. How to use LOCA glue to replace the LCD glass of mobile phone?

I. What are the advantages of LOCA glue over other adhesives?

The main advantages of LOCA compared to other adhesives are:

1.Rework Capability - LOCA glue can be removed for rework/repair if required.

2.It provides excellent adhesion even to uneven surfaces.

3.Provides excellent optical properties.

4.It is very durable.

II.How to replace cell phone LCD screen glass with LOCA glue

In order to replace a faulty, cracked or damaged glass/touch screen (PDA) on your cell phone or smartphone LCD screen, you will need the following cell phone repair tools:

1.Hot Air Gun or HOT Plate or LCD Separator Machine

2.Goof Off / or Hot Blade (A Soldering Iron with a Wide Flat Tip)

3.Putty Knife

4.Infrared Thermometer

5.UV Lamp

6.Illuminated Magnifier / Magnifying Lamp

7.LOCA Glue in a Syringe

8.New Screen / Glass for Replacement

9.Metal Spudger

10.X-acto Knife

1. Separate the glass from the LCD

Care should be taken when separating the glass from the LCD to avoid any unnecessary damage. Special care must be taken if the glass breaks.

The glass and LCD are firmly bonded together with LOCA glue. The glue must be heated to loosen the bond. This can be done with a heat gun/heat gun. Technicians with certain practical experience can easily do it.

However, in most authorized service centers and professional service centers, they use LCD separators.

How to separate the glass from the LCD display

Using a heat gun or LCD detacher, apply heat to the LCD to loosen the LOCA glue. In both cases, a temperature of 200-300 degrees Celsius is fine.

1. Gradually and evenly heat the front side of the phone. Use the Infrared Thermometer to check the temperature before trying to remove the glass. Make sure there is neither too much heat nor too little heat. Too much heat will burn the LCD screen while too little heat might crack it.
   
   
2. Start removing the glass from the top of the screen where speaker is located. Use the metal spudger to carefully separate the glass from the LCD screen. Move the spudger along the top edge and make enough space for the putty knife to slip in.
   
   
3. Reheat the surface and using the putty knife, carefully pry the glass away. After removing the Glass, use the Goof Off  or Hot Blade to remove existing melted LOCA glue and clean the LCD screen using lint-free wipes.
   
   
4. Some phones have “HOME” and “BACK” sensors attached to one end of the glass.  Carefully remove the connectors using the X-acto Knife.

Most professional technicians repairing iPhone and High-End Samsung Smartphone use LCD Separator machine.

2. Apply LOCA glue

LOCA Gel is available in liquid form. It is not as thick as other adhesives. Apply enough glue to the screen to form an "X" pattern with a "-" in the middle of the "X". Make sure not to apply too much or too little glue, and make sure there are no air bubbles.

The adhesive will gradually spread across the screen and spread itself to the edges without you needing to apply any pressure. If there are any air bubbles, press lightly on the LCD and guide the air bubbles to the edges.

3. Curing or drying LOCA glue

LOCA glue will not cure or dry out on its own. You have to use UV light to dry it. Always use a brand name UV lamp of about 30 to 40 watts. You can also use a UV nail dryer. But don't use flashlight UV light.

The curing or drying time for the glue is typically 1 to 2 minutes. It also depends on the power of the UV light source and the distance between the UV light source and the LCD screen or glass.

The above is today’s sharing, I hope it can help you understand how to use LOCA glue to repair broken LCD screen/mobile phone/smartphone glass. If you have other questions, please contact phonefix.