If keyboard does not work in Nokia 1680 or a few keys you can not work this problem in a few steps that are defined in this daigaram Bellow that is given in this post.
check all these tracks that can be defined with different colors in diagram, so you can find all the keys inside and outre inner and outers the same color used for the same key colors.it have the same meaning if any button does not work you can see the outer and inner sweater with another point that same color.power also appears in the side and its outer and inner, the ground goes to the back of the board as shown in diagram to make jumper.
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