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My LCD monitor is showing big white area(stationary) almost 9 sq inch(irregular) with coloured vertical lines. Can it be repaired anyway? In case it can be repaired what needs to be done/changed. Kindly help. Thanks in advance.

Saptarishi Chatterjee could be a bad LCD panel or a bad mainboard. You do want to go ahead and post some images of what your monitor shows with your question. Use this guide Adding images to an existing question for that so we can see what you see.