Nokia 1661 Light Solution, Path how to jumper it.
if keypad or lcd light is not working in nokia 1661 check these parts in nokia 1661.
if any one is not working or broken replace it.
check these links as shown in the diagram bellow.
it is working 100% you just have to check the continuity as shown here or if any link was broken you may have to only make jumpers as given.