Nokia 3110 Solution Ways and Jumper points are in this article. If your phone’s Lcd Display lights and keypad lights are not working make the jumper as shown in the diagram below. This solution works on all Nokia 3110 Rm-237.
First of all before making any hardware solutions clean the area behind LCD connector and the whole motherboard to make sure that rust or carbon is not causing this problem. I have marked Nokia 3110 light and keypad ways jumper points in the following diagram. If jumper does not work replace the marked component. Also try replacing the LCD itself because sometime damaged LCD can cause this problem.
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2nd Solution
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