Laptop keys stopped working [Closed]

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Registration date
Sunday July 31, 2016
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Last seen
July 31, 2016
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I get my sony laptop motherboard changed recently. All keys works fine then.. and i open my laptop to check if motherboard was new or not thereby touched my motherboard. Now some keys like Delete, Backspace, Enter,, Numlock etc are not working. Why? Is there any probability that circuit got damage or effected????? Pls help.