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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.
try check out for manual selection of network in your mobile if u get the proper signal then your work is done otherwise network ic might have been damaged u can get it done in nokia center or mobile repair shop