I recently replaced the display in one of my laptops (a HP nx6125). I'm getting alternate-line vertical banding, it's almost unreadable.
Does anyone have any exprience with this?
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This could be happening in these conditions:
Have you tried to connect your laptop to an external monitor to see if it displays correctly? If so, that means the LCD is defective, if not, your video card is dying.
I think it's most likely the inverter that's about to break. It seems like the inverter fails for every second pixel column on your screen.
All LCD screens must rotate the liquid crystals in alternating directions for each refresh so that the crystals don't get "stuck". Different panels use different schemes for rotating neighboring pixels or lines in opposite directions to minimize the unfortunate artifacts it creates (rendering some cheaper displays completely unable to display alternating pixel patterns, particularly if they use overdrive to turn crystals faster).