We can solve display light problem in nokia 5130 by few simple steps, make sure that lcd led is working correctly then check light coil and 3 leg ic.Also check that keypad light is ok or short the points to confirm that keypad led is working.Here is a simple diagram for this problem, Observe diagram carefully and do jumpers like diaram below.
nokia 5130 lcd light full jumper diagram

Nokia 5130 lcd light solution diagram 


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