While cleaning my monitor some of the liquid seeped between the screen and casing. Now there are three 1 pixel wide vertical lines from top to bottom. The colors of the lines vary. I thought the problem would fix itself over time after the liquid evaporated, but it's been over a month with no change.
Looks like the water is getting in to the LCD contacts. Or corroding them. If the monitor can be opened safely open it and place in a warm dry environment for a few days. Silica dehumidifiers may help. If the issue is not permanent this may fix it.
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Some cleaning spray must have leaked in through the bezel and went on to a circuit board. In this type of case this would be a type of matrix screen drive problem. If any of the boards are damaged they have to be replaced. I have my doubts you can buy circuit boards and service the monitor yourself. It would be much more reasonable to replace the monitor.
When cleaning a monitor with liquids, dampen the soft tissue with the cleaner, and then do the cleaning on the screen. Make sure no liquid will run down to below and beneath the bezel.
Try a monitor that has a vga output only, sometimes these laptops can't recognize the difference when there is a converter involved. It doesn't see the signal properly.
Try that and if a regular monitor works with vga then you know that monitor may not be compatible with that laptop because of the converter. You could also try another converter as well to see if that fixes the problem.
First you check the problem with monitor or cpu.you can check it by other monitor.after replacing the monitor it gives not display. then your monitor has any hardware issue.then you can repaired it from service center.