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If there is a poping sound inside the tv, some type of arcing takes places inside it. So many white lines across the screen can be caused by over screen voltage. You should contact to a service technician to rectify the problem.
Its the plastic cassing making the noise. If you press the tv together along the edges you will here a crack. Samsung and others did not use 99 cent padding between the plastic and the metal you need cushion padding. Its like not using a gasket or seal. Its a simple fix but the tv companies say its expansion.