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If any, all or a few keys not working in nokia asha 300 then this post will help you to solve all keypad not working problems easily and in a quick way. Simply look at diagram bellow and check all the track and links as shown in it.Nokia 2320 Classic Local Test Mode Problem Solution see All cellular mobile repair solution

Once you check with meter if any of them is broken make these jumpers and your problem will solve easily. All same color keys outer and inner are to define same link ways. If a single key is not working we can apply jumper form other key that have same color for outer or inner.
Some key are going to resistance and capacitors in diagram so we have to apply jumpers on those places and parts. In diagram above a few small diagrams have red border and these are zoom images of the board so that you can see parts vary clearly.
So zoom diagram are only to show close up of board. The diagram above also contain on off button ways in it.
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