Yip.....I had the same thing when I got my 1520 back in January. It was quite extensive and ran the width of my phone screen. It was particularly noticeable when the screen was black or set to high light. In fairness, I rang up Vodafone and told them what the problem was (they called it light leak and said its becoming quite a common problem in phones of all makes with high res screens), I sent the phone in for repair and had it back within 3 days.
A happy ending...........until I dropped the %&##? phone a month later, shattered the screen and had to send it in for repair.
So.....I've had my phone 6 months and I'm on my third screen already
but its worth it. It's by far the best phone for movies, videos, programme streaming and reading that I've ever owned. I love it