I have the same projector and had the same problem, the main board was replaced under warranty and the lines went away. 6 months later they are back again. The projector can handle a high resolution so that is not the problem. The white lines appear even when no source is connected (splash screen)
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Hi I had the same problem. Broken white lines across the top of the screen. This is called overscan. You need to go into the Setup menu, other settings. 16:9 overscan needs to be on. Hope this helps.It solved our problem.