Make sure the diffuser sheet surface is clean and preferably kept clean during disassembly and no need to touch the surface. If need to clean, use mild proper cleaning solution (30% ISO, 70% distilled water mix) and micro fiber to wipe gently clean. Anything on the surface will be trapped under the LCD

Position everything so that the buffer board is guided over an edge and remains freely movable. Pick up the LCD with the suction cups and install it by first aligning it in the two corners opposite the buffer board. Then carefully place the LCD in the plastic frame, making sure that it is properly seated in the guides.