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My old Sharp DT-510 sometimes flickers and it seems to have gotten worst today (not as it does it more often, but the flickering itself is more noticeable).

I don't think it's the bulb as it doesn't flicker across the entire screen, mostly the top right part.

What could be causing this? Would cleaning something help or will it just get worst?

At least it's mostly noticeable on static images and not much at all during video playback