We can solve display light problem in nokia 1800 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 1800 blank lcd problem solved
Nokia 1800 blank lcd problem solved by easy jumper

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