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If you take your Macbook to most repair companies with a cracked display, they'll undoubtedly say you need to replace the entire display assembly and charge you some astronomical figure. It really isn't an extremely difficult procedure to do yourself however, and so we've created the guide below to show you just how to do it.
To begin, use a heat gun to loosen the double sided adhesive strip that holds the glass in place. Use caution, and heat the glass in short segments as over heating can cause damage to your LCD.With the glass heated, place a strong suction cup on the glass and pull up and away from the glass.
If heated properly, you'll be able to see a small gap between the glass and the and the rest of the display. Insert a thin piece of plastic such as a credit card or movie rental card into the opening. Work the piece of plastic in enough where it can be slid along the seem of the glass. This will break the adhesive strip holding the glass in place.Repeat this procedure along the entire edge of the glass assembly. When you meet resistance, heat the area and repeat.
Once you have used a hair dryer or heat gun to warm the adhesive strip, use a strong suction cup to begin to separate the glass from the display assembly.