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Dark Spot on the LCD

Hi! I’ve been using my Casio keyboard for years now and in one incident, I just noticed a dark spot on its LCD screen. As seen on the photo, there is a cover underneath the panel and the dark spot is right on the LCD. When I turn off the keyboard, it’s still there. I am in question on how and why this happened. Any answers will be much appreciated. Thanks!

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Black spots on LCDs are typically caused by either superficial dirt or debris, a stuck pixel or a dead pixel. The easiest problem to fix, of course, is a superficial dirt or debris. In comparison, stuck pixels are a little harder to fix, whereas dead pixels are the hardest to fix. If a stuck pixel is creating a black spot on your LCD, you may be able to use a third-party flashing tool to restore it.

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After looking a little closer at the picture, it looks to me that the screen got damaged from heat. It's hard to tell from the picture if the heat came from internally or externally.

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