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What is the purpose of the blue plastic stuck down on the back of a new LG G4 screen?

What is the purpose for the blue plastic stuck down with glue on the back of a new LG G4 Screen for replacing old one which was damedged for example the electronic parts where motor vibrator and ear piece for?




Best contact whoever repaired the phone. It may be their warranty seal. But as I have said, contact them to verify the purpose of that.



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