Dear Tuyen, How many defective product? I may found the reason,the Aluminum plate has been install on the displayer, Because displayer's height is 10.5mm,the height should be same as Plastic separation column's height plus aluminum plate's height (Plastic separation column's height is 9mm,aluminum plate's height is 1.5mm), the Key's height is 11mm,so key should be slightly protruding vs. aluminum plate, If this reason is correct,need install again,
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