Some good advice from someone who has been looking for this solution for many months, FORGET jumper solutions because you are just wasting your time with this and forget reheating the board as well.
I do not have a diagram to upload but those of you should know where the black bga chip is on the left hand side of the keypad system connector, that is all you have to replace, no jumpers needed. I have just finished my fourth N70 in this way, just change the chip and nothing else.
you can also find the chip on 6680 board.
please take my advice and you will not regret it.