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They can't be fixed. Consider the 1280x1024 grid, each location using three transistors to control illumination. (~4mil). They're laid down as part of the manufacturing process and not a component you can desolder and replace. There are probably others you haven't noticed. (off color vs completely off) Very few LCDs have zero defects. Check manufacturer policy and you'll find most allow 5 or more bad pixels (ISO 13406-2, class II) before a screen is considered defective. Zero defect screens (class I) are much more expensive.
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