The adhesive that secures the logic board to the frame is very strong. To remove the board, follow the next steps to weaken the adhesive using high-strength (>90%) isopropyl alcohol.

Elevate the left side of the iPad so that it lays down at an angle.

Apply a few drops of isopropyl alcohol along the left edge of the logic board.

Be careful if you're using a syringe with a needle or other sharp instrument to dispense isopropyl alcohol—a punctured or bent battery may leak dangerous chemicals or cause a fire.

Let the alcohol soak for one minute to soften the adhesive under the logic board.