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There may be two main issues with the image on the LCD laptop screen: 1. Backlight issue. 2. Image issue.

An image issue may be caused by various problems such as faulty video card, losing cables, bad motherboard, faulty screen, etc. In this case, you can usually see the screen lighted up, but with a distorted image. Backlight issue may be caused by a bad or losing cable, faulty inverter, dead backlight CCFL bulb or power not supplied from a motherboard to an inverter

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Q: When do you know the lcd screen on a laptop is bad.?
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