to solve test mode local mode in nokia 1680 and 1681 you can follow a few steps that i am going to discus in this post and also are define in diagram that is attached with this post.
carefully look at the diagram and in it there are a few parts in lined with parrot color.clean these resistances with electronics cleaner and then leave them to dry under electrical bulb for a few mint or apply hot air so that they can be dry.if problem can not be solve then you have to replace them with new parts from any other board.
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