LCD panels have many advantages over their older CRT and dot matrix-based brethren, including sharper images and lower power usage. However, they may be prone to issues with the display. Specifically, as you use your LCD panel for your device, horizontal lines may appear as white or black spots, keeping you from seeing the full picture. There are a number of things that can cause this problem, some simple to fix, some not.
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Check the cable connecting the LCD panel to its image source. Cables become damaged over time and can be frayed or just worn out from use. Remove the offending cable and replace it with another of the same type, then check to see if the lines on your LCD screen are gone.
In some cases, the source for the LCD panel may be the cause. For instance, if the LCD panel in question is for a PC monitor, there might be a problem with the graphics card. Solutions include reinstalling any drivers that came with the card, checking all cables and the worst-case scenario: needing to replace the source itself.
The panel itself may be the cause of the problem. If there was damage to the screen from a blunt object or overheating, it can cause damage to the crystals beneath the screen. Furthermore, damage to the motherboard can render the panel unusable. If your panel or monitor is still under warranty, replace it immediately.
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