remove lcd and clean points on board with electronics cleaner.Clean also resistance and parts as shown in above diagram.try to re sold this lcd and if display can not be in original condition replace it with new LCD.
you can check all these tracks with multi meter and if any of them is not working or missing apply these jumpers.print number 10 and 11 are used for light function so if lcd light is not working or is blank then check these two prints.
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