Why do I have horizontal white lines going across my tv screen, and how do ?

Hi
If the lines are fairly static thin white lines & the pix is a bit overbright, this is a fault condition.
Either Line transformer screen assy or a CRT Drive problem
(My guess without seening the fault ) , contact Samsung service if under warranty or take it to your favourite repairer.
This is a website of a technician service http://1stresponseelectronics.com/ , you can get more details for the solution and know the repair price.

alex
August 2013