To solve signal problem in nokia 1600, nokia 1112 and nokia 1110 First Check Antina points on motherboard or clean them. Reehot signal ic (pa) with heat gun. 

Second PA Power Input Ways
Then Remove Pa And Make Jumper Like This
AFTER FIX THIS JUMBER!PHONE SHOW SAME NET NO ACCESS PROBLEM?
5)JUST CHANGE RED MARKED RX FILTER OR RESISTER(TX CONTROLL)
LAST TRY TO CHANGE RF IC

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