here is a diagram that will help you to solve keypad problem and keypad not working problem all keys not working or a few keys not working solution.you can see in diagram all links are indicated with different colors so that can be identified and understand easily.
so check all these links with electronics meter and if any ot them is broken make these jumpers to solve keypad problem in nokia 1662.because nokia 1662 do not have a dial ic so the main links goes to uem you have to make jumpers vary carefully so that no one pin broke.
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